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Problem Statement: How do I add properties for a component that is available in a newer version of Aspen Plus into an older one? | Solution: In the newer version, include the databases where you want to look for the components in Components/Enterprise Database:
Add the components of interest:
Go to Tools/Retrieve parameter results:
The forms in Properties/Parameters will be filled:
Note that all of the values retrieved come from a Database (in thi... |
Problem Statement: The energy demand for the Rate Based DGA model for CO2 seems too low. During a case study in which I investigated several lean loadings of the solvent with focus on the specific energy demand of the desorber (kJ/kg CO2 separated), I observed that with higher lean loading the energy demand decreases s... | Solution: In the attached file, we have updated the DGA model using the methodology we applied to the MDEA model (Zhang and Chen (2011). The backup file will run in V7.2 and higher.
We fit the VLE and heat of absorption data simultaneously. The absorption heat data is helpful to determine correct temperature dependence... |
Problem Statement: How to determine the power of a stream against the reference temperature and pressure conditions that the user specifies? | Solution: The power of the stream against the reference temperature and pressure can be calculated as a difference between the enthalpy for a mixture in current stream conditions and enthalpy for the mixture in reference conditions specified by the user.
These calculations can be done in the calculator block and user h... |
Problem Statement: The hydrolysis of calcium carbide produces acetylene and calcium hydroxide. This reaction involves chemical components in solid, liquid and gas phases.
How to model this reactor properly? | Solution: The hydrolysis of calcium carbide is given as
CaC2 + 2 H2O → C2H2 + Ca(OH)2
This reaction is the basis for the production of acetylene. Involved in this reaction, calcium carbide (CaC2) and calcium hydroxide (Ca(OH)2) are solid. Water (H2O) is typically in liquid state. Acetylene (C2H2) is gas.
To set u... |
Problem Statement: User Property Model example: liquid vapor pressure subroutine with regression of the user model parameters. | Solution: The attached example illustrates how to implement a user property model in Aspen Plus, in this case for the calculation of the liquid vapor pressure (PL). Each user property model should include a principal subroutine that calculates and returns the desired physical properties. Since the principal subroutines... |
Problem Statement: Sometimes there are multiple standard statements corresponding to one Batch Plus operation. For example, Charge operation might correspond to Visual Inspection, Weighing the Material and Charge. In such case, what modification can the user do to prevent the page break in Microsoft Word to break in be... | Solution: Clear the allow rows to break across pages box in Table | Properties | Row dialog, for each table in each standard statement.
If you highlight rows of a table and check Keep With Next in the Format | Paragraph... dialog, Word will keep those sets of multiple rows on the same page.
So, if you edit each standar... |
Problem Statement: Can Not Create New Project. | Solution: Check the following:
1. Is the working directory read-only? If it is, remove the read only status, if you still have problem go to next step.
2. Under Aspen Batch Plus install directory (by default, it is C:\Program files\AspenTech\Aspen Batch Plus 2004.1), there is a bin folder which store all th... |
Problem Statement: Why is the molecular weight of my stream containing a polymer or oligomer component calculated as if it only has one unit of monomer? | Solution: The Average MW displayed in the Stream Results is calculated from the parameter MW. The actual value can be reported by adding a Property Set with the property TRUEMW.
This will report the correct molecular weight considering the number of segments in the oligomer or polymer.
Keywords: segment, monomer
Refere... |
Problem Statement: How does the Energy Map button in the ConSep(Shown below) model work and when can we use this feature?
Is this option also available in the ConSep block in the new interface for versions V8.X? | Solution: The Energy Map button allows the user to select how to calculate the enthalpy of the lumped feed when component mapping is defined. It affects the quality of the lumped feed, and therefore the design results.
The quality of the lumped feed is defined as:
quality= (feed_enthalpy - v_enthalpy)/(l_enthalpy -... |
Problem Statement: Very large file crashes when opening in some machines. | Solution: It is possible that there are not enough resources.
By default Windows does not allocate enough resources, so some registry settings have to be modified. Here's a link to the article from Microsoft support:
http://support.microsoft.com/?kbid=126962
Here are the steps to fix the problem (BE SURE TO REBOOT ... |
Problem Statement: What Intellichem Synthesis Version Does Aspen Batch Plus Intellichem Interface Support? | Solution: Version 3.60 and 3.65.
The Interface format AspenTech and Intellichem has agreed upon is that
For recipes, it is BatchML
For materials, Aspen Batch Plus uses Intellichem's format.
AspenTech has been issuing Aspen Batch Plus/Intellichem interface according to this format from version 12.1. Intellichem supports... |
Problem Statement: The outlet stream mole flow is in lbmol/hr. Instead, I want mol/sec. My input for the stream mole flow is in mol/min, but I don't see a way to change the outlet stream mole flow units. | Solution: Follow the below steps to change the units of the outlet stream mole flow. This will change the units for ALL stream and block output.
1. Navigate to Data/Data Browser/ Setup/ Units-Sets, and double click Units-Sets folder.
2. Click New button to create a new set.
3. Enter an ID (Set1) and click OK.
4... |
Problem Statement: I have a simulation that is not using any external subroutine, however, after running I see the following error and the simulation stops.
*** SEVERE ERROR (FPFNDI.1) COULD NOT RESOLVE USER OR IN-LINE FORTRAN SUBROUTINE(S): SUBROUTINE ZZSENS IS MISSING
How can I solve this error? | Solution: This error happens in two situations:
i) If there is Fortran syntax inside a calculator block, design spec or a sensitivity analysis that cannot be interpreted by the engine, or
ii) If the program is forced to write all inline code in an external subroutine to be compiled.
The engine creates simple stateme... |
Problem Statement: How can a user access pre-defined petroleum Property Sets in Aspen Plus? | Solution: When opening a new simulation, select to open the Petroleum with Metric Units or Petroleum with English Units templates.
The templates can also be imported into an existing Aspen Plus simulation by going to File | Import. The templates can be found in the following directory:
C:\Program Files (x86)\AspenTec... |
Problem Statement: How can I delete a molecular structure in the Pure Components dialog after it had been accidentally imported from a *.mol file? | Solution: Since this is a situation rarely encountered, there is no Undo or Delete key available. The Delete button in the Pure Components dialog will actually delete the entire record of a given component.
To delete the molecular structure only, use Notepad (or any other editor of your choice) and create an emtpy *.mo... |
Problem Statement: How do I change the color of the unit operations in Aspen Plus? | Solution: There is no way to change the color of the unit operations that are already added to a simulation. To change the color of the icon you need to create your own icon library.
To create an icon library in Aspen Plus, go to the Library menu and click New. This will display a window to enter the library name and t... |
Problem Statement: What operations use use or change Particle Size Distributions (PSD) in Batch Plus? | Solution: Most of the secondary operations use or manipulate the particle size distribution:
Mix
Classify (separation)
Screen (separation)
Granulate (produce solid)
Mill (reduce size)
Pulverize (reduce size)
High-shear-Granulate (produce solid)
Extrude (produce solid)
Roller-Compact (produce solid)
Also, the following ... |
Problem Statement: How to navigate through the MS Access results database to find the material components (pure components and pre-defined mixtures) that make up the contents of a vessel at the end of each operation | Solution: When you open up the Microsoft Access database from the Results Menu/MS Access, there are 45 tables to choose from, and each one contains cross-refrences to one or more other tables.
To find the material components of a vessel at the end of an operation:
Start with EquipmentContents table. Within the Equipmen... |
Problem Statement: I want to define a component in an electrolyte simulation which is currently not available from the Aspenplus database. I know that I can setup these components as a molecular solute and non-water solvent. I would like to know how Aspen Plus distinguishes between those two types and which parameter c... | Solution: In Aspen Plus, solutes are those components which are defined as Henry's components. Therefore, if the ENRTL property method that the user has defined also has a HENRY-COMP ID associated with it, then the components defined for that HENRY-COMP ID will be treated as a solute. Everything else will be treated ... |
Problem Statement: When using a sentence in the new help, there are many results not relevant. How do I search for a specific topic in the new help? | Solution: Starting in V8.8, the Aspen Plus and all the products from the aspenONE suite of products help was redesigned to discover more topics and obtain more relevant results from the search. The help is divided in Contents and Index tab and the Search feature.
· The Contents tab displays a list of the topic... |
Problem Statement: How do I use Turbo Start to make Aspen Plus start more quickly? | Solution: Turbo Start is an option introduced in V8.8 to improve start-up performance. It can be enabled on the File | Options | Files tab. Turbo Start pre-loads part of Aspen Plus. When you run Aspen Plus, having it pre-loaded allows Aspen Plus to start very quickly. The pre-loaded version of Aspen Plus does not consu... |
Problem Statement: How to copy customized APED from Aspen Plus V7.1 to Aspen Plus V7.2 | Solution: You can use Aspen Properties Database Manager to accomplish this task. The program is located under: Start | Programs | AspenTech | Process Modeling V7.1 | Aspen Properties.
After starting the program, right click mouse on Aspen Physical Properties Databases and select All Tasks, Backup DataBase and provide i... |
Problem Statement: How is the IN USE bar displayed on the Batch Plus schedule? | Solution: The Schedule View in Batch Plus will show a cross hatched bar with the words IN USE if material is added to equipment and additional operations are performed in the same step.
For example, an IN USE bar will appear for Tank A if you charge reactants in Tank A, perform operations in Tank B, then perform operat... |
Problem Statement: Is it possible to use a physical property monitor (PPMON_xxx) in a user property model subroutine? | Solution: CALUPP and other physical property monitors (detailed in chapter 3) should not be called from user property subroutines. Doing so may result in recursive function calls which may overwrite variables (such as those in Common blocks) used in the first call, which that call may still need. This will lead to unpr... |
Problem Statement: I have more than one version of Microsoft Excel installed on my computer. When I use a Calculator Block, can I select the version of Microsoft Excel that the calculator blocks uses? | Solution: When using Aspen Plus it is not possible to select a specific version of Microsoft excel if you have more than one version installed on your computer. In these situations, Aspen Plus invokes the last version of Microsoft Excel that was installed.
TheSolution would be to have either:
i) Only one version... |
Problem Statement: For many pure components, DIPPR parameters are available from the Batch Plus databanks to calculate the liquid phase density as a function of temperature. For water, Aspen Batch Plus does not provide these DIPPR coefficients. How is the density of pure water calculated? | Solution: In the absence of DIPPR coefficients, Aspen Batch Plus uses the Rackett model to calculate the liquid phase density. A value for the Rackett parameter of pure water is available from the Aspen Batch Plus databanks; hence, the liquid phase density of pure water is calculated using the Rackett model.
Keywords: ... |
Problem Statement: How do I know if the CPA parameters are in the databanks? I cannot see them in the Aspen Properties Enterprise Database (APED) Manager or retrieve them using Retrieve Parameter Results into the User Interface | Solution: The CPA parameters are proprietary and cannot be seen in the user interface. In order to determine if the parameters are available, you can view the status of values.
After retrieving the CPA parameters, you can go to the Methods | Parameters | Results form to view the status of pure and binary parameters. ... |
Problem Statement: What is the difference between using an RStoic and RGibbs for combustion? | Solution: You can check the Generate combustion reactions on the Setup | Combustion sheet of an RStoic to have it automatically generate combustion reactions. Full combustion is assumed when this option is specified: all carbon is converted to carbon dioxide and all hydrogen to water. The nitrogen combustion product ma... |
Problem Statement: What files in a Batch Plus project directory should not be deleted? | Solution: Files with extensions of .prj, .eqm, .mtl and .stp should not be deleted. If any of these files is deleted, the project may not open.
To clean up a project directory (deleting output or intermediate files), use the Cleanup files feature under Tools.
Keywords: file, files, cleanup, delete, file extension, file... |
Problem Statement: How to use custom models in the Aspen Batch Process Developer Models library to describe batch operations in your process. | Solution: The Custom model can be used to represent a batch operation that cannot be adequately described by any of the existing models in the Aspen Batch Process Developer Models library.
The Custom model may be used to represent any of the following phenomena:
A? Addition of one or more feed streams
A? ... |
Problem Statement: In V7.1, the help lists 6 option codes for GMENRTL; however, there are only 3 on the form. Are the others available; how should they be used? | Solution: The electrolyte NRTL activity coefficient model (GMENRTL) has three option codes. The electrolyte NRTL Gibbs free energy model (GMXENRTL) has six option codes. The electrolyte NRTL enthalpy model (HMXENRTL) has seven option codes. These option codes can affect the performance of these models.
Option Codes for... |
Problem Statement: What is the correct way to specify the number of valves or caps on a tray? | Solution: The number of passes on a tray is entered on the Tray Rating | Setup | Specs sheet. A tray is made of panels. It can have 1 to 4 passes. The convention in Aspen Plus is
No. of passes
Panel Type
one-pass
A
two-pass
A,B
three-pass
A,B,C
four-pass
A,B,C,D
Refer to the Aspen Plus online help for single-pass and... |
Problem Statement: How do I define the Actual Volume flow of a mixture as a design spec flowsheet variable? | Solution: Firstly, add the volume flow (VOLFLMX) as a property set (Properties / Prop-Sets).
This property set can be specified as the Design Spec flowsheet variable as follows:
Keywords:
References: None |
Problem Statement: The vent of the vessel is closed. Why do I still get emission? How can I turn the emission off for vessel which has a closed vent? | Solution: For historical reason, emission calculation does not take into consideration of vessel's vent status. There is plan to make this determination of vent status to be automatic - that is, if vent is closed, no emission comes out of the vessel.
Meanwhile, you can turn the emission off for any operation by going t... |
Problem Statement: I could not have multiple copies of the same form open. I was looking at the profiles of a distillation column. I had selected profiles, and then the hydraulic profile tab. I then went back out to the flowsheet, re-selected the block, selected results, then profile and the compositions. Instead o... | Solution: When we tested the new user interface we found performance dropping quickly as the user accumulated forms. Every time you clicked a block it would bring up the input form. Customers would end up opening many copies of the same form. Since the presentation of multiple forms is not very good many customers were... |
Problem Statement: Aspen Batch Plus is installed on Citrix enviroment. Have problem open Aspen Batch Plus projects by multiple users. | Solution: The following files on Citrix need to be modified:
bpv01.bp - this file is located under Aspen Batch Plus install directory, bin folder
All the language template files - located under Aspen Batch Plus install directory, Language folder.
By modifing the above files to READ-ONLY, multiple users can access citri... |
Problem Statement: Is it possible to have two separate outlet streams for two phases from a HeatX block to represent a condenser or vaporizer?
I have two separate nozzles for vapor and liquid outlet from shell side of my heat exchanger. The vapor goes back to a column and the liquid is the product. How can I model it u... | Solution: The option of having multiple outlets for each side of a HeatX heat exchanger is available in AspenPlus V8.0 and higher. A simple example file that can be opened in Aspen Plus V8.4 and higher is attached.
First, connect more than one outlet to the Hot or Cold port of the heat exchanger.
Then, specify the phas... |
Problem Statement: How do you incorporate cross linking in polymerization kinetics? | Solution: Crosslinked polyemrs usually involve reactions with pendant double bonds. Pendant double bonds (vinyl segments) resulting from the propagation of diene monomers such as 1,3-Butadiene can generate cross links between polymer chains.
The polymer attributes XLFLOW and XDENSITY are used to track the mole flow of ... |
Problem Statement: For a metallocene copolymerization reaction of monomers M1 and M2, can we determine the fraction of active catalyst that have M1 as the last inserted monomer? | Solution: Polymer attribute “LSEFLOW” needs to be included in the list of attributed calculated during polymerization process.
LSEFLOW will track the flow rate of live end segments for each type of active site. With calculated LSEFLOW, the catalyst flow rate and maximum active sites we should be able to work out the fr... |
Problem Statement: I'm trying to load an old simulation (created with Aspen Plus 2006.5 or older) with Aspen Plus V7.0 (or higher). I get a ID Conflict window such as shown below.
Why am I getting this window? What should I do? | Solution: The documentation mentions in the What's new in V7.0:
IDs for Design Specs, Calculators, Transfers
Design Spec, Calculator, and Transfer blocks may now be placed on the flowsheet. A side-effect of this is that they must have unique IDs. When opening backup files from previous versions where Design Specs, ... |
Problem Statement: Which emission model to use for Purge Operation? | Solution: In Purge operation, if you go to Model tab, take a look at the emission models available to this operation, you will see Purge, Sweep, Depressurization and other emission models are available to this operation.
Although this is confusing, one should NOT use Purge or Sweep emission model for Purge operation. O... |
Problem Statement: HP announced in June 2005, they would stop selling their Fortran Compiler, HP Visual Fortran 6.6 on December 1st, 2005. HP also advised users to migrate to Intel Fortran Compiler version 9. | Solution: Currently, the following Aspen Tech products allow compiling user routines using HP Visual Fortran:
? Aspen Plus
? Aspen Properties
? Aspen Dynamics
? Aspen Custom Modeler
? Aspen Adsim and Chromatography
Attached PDF file (Japanese) is a summary of the comp... |
Problem Statement: Why does the temperature of water increase when the pressure decreases? | Solution: The Joule–Thomson coefficient is defined as the change in temperature with respect to an increase in pressure at constant enthalpy.
At room temperature for most vapors (including steam), Joule-Thomson expansion lowers the temperature. Some notable exceptions are hydrogen, helium, and neon. However, for liqu... |
Problem Statement: I am attempting to see if Aspen Plus correctly predicts the solubility of oxygen in water. To do this I flash a mixture of oxygen and water and take the concentration of oxygen in water for the liquid outlet. I use UNIFAC as property
method and Oxygen as Henry component. However, based on Aspen repor... | Solution: Water solubility of Oxygen at 25 ?C and 1 bar is calculated by Aspen Plus as 39.3 mg/l. In air with a normal composition at sea level, the Oxygen partial pressure is 0.21 bar. This results in disSolution of 39.3 * 0.21 = 8.3 mg Oxygen/l in water that comes in contact with air, which is the value reported on l... |
Problem Statement: After EO synchronization, or some other time, all the messages in the Control Panel unexpectedly disappear. | Solution: When you reinitialize a simulation, the Control Panel messages are cleared intentionally since the old messages no longer apply. When you click the Purge Messages button, the messages in the Control Panel are cleared.
In certain rare cases, the Control Panel may appear to blank out during a run. If this h... |
Problem Statement: How is Heat Capacity calculated in Batch Plus? | Solution: All mixtures in Batch Plus are considered to be ideal. No calculations are performed for vapor-liquid or liquid-liquid equilibria. The extended Antoine equation is used to calculate vapor pressure for the vapor emission models. The actual equations for these models will not be listed here. They can be found i... |
Problem Statement: When trying to run a simulation with NC solids I get the following message in the Control Panel and the calculations stop:
NON-CONVENTIONAL ENTHALPY MODEL ENTHGEN HAS MISSING PARAMETERS
NON-CONVENTIONAL DENSITY MODEL DNSTYGEN HAS MISSING PARAMETERS | Solution: NC solids are materials characterized in terms of empirical factors called component attributes. Component attributes represent component composition by one or more constituents.
The simulation is not running because you need to enter the heat capacity (HCGEN) and density (DENGEN) parameters in the Properties... |
Problem Statement: How do I copy an entire facility and transfer it into another project? | Solution: To copy an entire Facility from another Project:
1. On the source drop-down list on the left-side of the dialog, click the Facility to be copied.
2. Click the Add Facility button to bring up the Add Facility to current project dialog, which is shown in the following screen:
You have two options wh... |
Problem Statement: What is the difference between Run/Simulate Batch and the Play button? | Solution: Run -> Simulate Batch always reads the data and simulates the whole step, but the play button will detect the change you have made after previous simulation and simulate the operations supposedly affected.
On some occasions, the play button does not detect the modification properly, so the simulation results ... |
Problem Statement: How to import equipment from another Project into a Batch Plus simulation? | Solution: From the main menu, go to Data\NetworkSelect\Equipment. Under Select Equipment from:, click the browse button. Browse the directories and choose the equipment file (Projectname.eqm) . The equipment in this file will appear in the left side of the window. You can import all equipment by clicking Add Facility o... |
Problem Statement: How are vessel Capacity or Total Volume and Maximum Fill Factor used? | Solution: Capacity: used in batch operation
Maximum Fill Factor: used in conjunction with Capacity to determination of vessel overflow. Total Volume: used in vapor emission calculation.
When Total Volume and Maximum Fill Factor are not specified, Total Volume = Capacity and Maximum Fill Factor = 1.0 are implied.
Keywor... |
Problem Statement: How does the Power law expression for the U Method in HeatX work? | Solution: The power law used in this case is simply an empirical expression, meant to allow the user to adjust a reference global U value based on the flow of either the hot side, the cold side, or both.
One should specify the controlling side as the flow variable unless both sides contribute to the U and therefore bot... |
Problem Statement: My Polymers Plus model uses the PC-SAFT property method. This is a user model in version 10.2. I understand that it is a system model in version 11.1. How do I convert my file so that it uses the system model? | Solution: Open the file in version 11.1
If this is the first time you are opening the file in version 11.1, you will be prompted for a decision about upward compatibility. The choice you make (Maintain complete upward compatibility vs. Use the following new features) will not affect the PC-SAFT property method.
Write... |
Problem Statement: The components in the Stream Table may not be shown in alphabetical order. Why? | Solution: The components are listed by the numerical IDs assigned by Batch Plus. When sorting the list in Excel, apply sorting to the entire set of rows, not just the components.
Keywords:
References: None |
Problem Statement: An Extract operation is used in Batch Plus; however, there is no specification allowed for the destination of the upper phase.
OR
A Decant operation is used in Batch Plus; however, there is no specification allowed for the destination of the lower phase.
Which layer is collected? | Solution: The Extract and Decant operations are very similar. If you want to specify the destination of the upper phase, use the Decant operation. If you want to specify the destination of the lower phase, use the Extract operation. The other phase remains in the equipment at the end of the operation.
Note that the Bat... |
Problem Statement: Material database is missing to select the components. | Solution: Aspen Batch Process Developer uses Enterprise databank from Aspen Properties. If Aspen Batch Process Developer is not patched compatibly with Aspen Properties then Data | Network Select | Material view will display Empty list. Cumulative Patch installed for Aspen Plus or Aspen HYSYS will also update the Aspen... |
Problem Statement: Is it wise to specify DHFORM for the entire polymer? | Solution: You can specify the heat of formation for the segment or the polymer; however, there are different implications if you are considering other segments.
Polymer parameters take higher priority than segment parameters. If you specify the parameter for the polymer component, this value is always used, regardless ... |
Problem Statement: I cannot open an input file from the Graphical User Interface. | Solution: If the input file was created from an old version of Aspen Plus there may be some compatibility issues trying to open it in a newer version. What you can do to work around this problem is the following:
1. Launch Aspen Simulation Engine from Start/Programs/AspenTech/Process Modeling Vxx /Aspen Plus/Aspen ... |
Problem Statement: Polymers Plus installation completes but no entry is added in Windows Start\Programs\Aspentech\Aspen Engineering Suite menu | Solution: Polymers Plus is a layered product within Aspen Plus and will not have any entry under:
Start\Programs\Aspentech\Aspen Engineering Suite; however Polymers Plus forms are installed after product installation. To verify that Polymers Plus is installed, start Aspen Plus and select Tools/Options/Startup, the foll... |
Problem Statement: I am unable to find chain-size distribution on the Stream Results | Poly Curves sheet, even though a Polymer ID has been specified on Components | Polymers | Distributions form. The chain size distribution shows zero on the Poly Curves sheet. | Solution: The method to track chain length distributions is not valid for all types of reactions. The method assumes that polymer molecules are stable once they are formed, therefore, it is not valid for reversible living polymerisation. It is supported by: Free-Radical, Ziegler-Natta and Emulsion reactions. It is not ... |
Problem Statement: Why are there no vapor emissions reported for my drying operation? | Solution: The models available for calculating the vapor emissions from drying are
1978 CTG Drying Wet Solids
1978 CTG Vacuum Drying
1994 ACT Drying Wet Solids
1996 AT Drying Wet Solids
They should be used to calculate the emissions associated with drying solid product in a dryer with no emission control equipment. The... |
Problem Statement: After adding a new user library, how do I make sure that it is reference and shown in the model palette in future flowsheets? | Solution: The library is listed in Manage Libraries but is not selected, which is the expected behavior; we don't by default open all of a user's known libraries for a new simulation unless he asks for it. If you select it in Manage Libraries, the models appear in the palette.
To allow easy creation of new simulations ... |
Problem Statement: How do I model a terminal double bond polymerization in Aspen Polymers? | Solution: For some catalyst systems, primarily metallocene, polymer chains with long chain branches are formed. However, the long chain branching frequency is usually small. The long chain branches are believed to be due to propagation
reactions involving a live chain and a terminal double bond on a dead polymer chain.... |
Problem Statement: If you go in Aspen Plus v7.2 under Components |Specifications on the Enterprise Database tab, only pure component data bank selection is available.
In V7.1 you could select pure component databanks and binary parameter databanks separately.
From Tools, Options, the Component Data tab allows both ... | Solution: If you uncheck the option Retrieve binary and pair parameters automatically in the GUI, then you can select the binary parameter databanks under Components, Specifications, Entreprise database. This option prevents duplicating the parameters in the GUI (e.g. if the databank is updated, the simulation will use... |
Problem Statement: Presence of Double quotes ('') in the Setup | Specifications | Description will give the following error message:
** ERROR IN A DESCRIPTION PARAGRAPH
SKW: DESCRIPTION
INVALID USE OF POSITIONAL NOTATION.
THE SENTENCE AS ENTERED WOULD ASSIGN THE VALUE:
QUOTES TO TERTIARY KEYWORD NUMBER 2.
HOWEVER, TH... | Solution: Double quote () have not been allowed in the description since 2006.5. Single quote (') are allowed. If the file is saved using 2006.5 or earlier, delete the double quote () from the description. You will not be able to re-enter it.
Keywords: FOR THIS SENTENCE. SENTENCE IGNORED.
References: : CQ00432897 |
Problem Statement: What's New in Aspen Plus V7.3? | Solution: Aspen Plus V7.3 includes many new and improved features to help you save time and effort developing new conceptual designs, evaluate relative capital and operating costs for alternative process schemes, improve the energy efficiency of your processes, and examine the carbon footprint of proposed designs.
Ther... |
Problem Statement: Why does the objective function keep decreasing past the value reported on the Column | Analysis | NQ Curves | Summary sheet? | Solution: The traditional NQ curve is a plot of heat load (Q) against total number of stages (N). However, the concept of NQ curves is not restricted to just heat load. These curves can be used with any objective function.
The NQ Curves feature in Aspen Plus determines the curve by performing calculations at differen... |
Problem Statement: Aspen Plus 10.1 should be loaded and run before you attempt to use it with Batch Plus. | Solution: Batch Plus will not recognize that Aspen Plus has been installed until it has been run once. You can run the Testprob.bkp found under the \Program Files\AspenTech\Aspen Plus 10.1-0\Favorites folder.
Note that Aspen Plus 10.0 is not supported in Batch Plus 2.0b.
Keywords: Installation
Aspen Plus
Batch Plus
Ref... |
Problem Statement: What happens if more than one outlet stream is denoted as the key step output? | Solution: Batch Plus will use the first occurrence of this specification.
Keywords: BATCH PLUS
Key
Step
Output
Product
References: None |
Problem Statement: How to report molar properties for a polymer in the stream report? | Solution: Aspen Plus includes in its property sets two properties to report the true molecular weight and the true molar flowrate of a polymer.
For V9, the process to add those values in the stream report is as follow:
1. Go to the stream that you want to review and select the results tab.
2. Click on add prope... |
Problem Statement: Is it possible to define Utility (heat transfer fluid) as mixture? | Solution: Currently, you cannot use a mixture to create a utility; only pure components are allowed. You have to create a new pure component with the physical properties that the mixture would have to simulate similar heat transfer activities. Then, create a new utility based on the pure component.
Keywords: Utility, H... |
Problem Statement: What version of Visio is required for Batch Plus 2.x? | Solution: Batch Plus 2.0, 2.0b, 2.1 and 2.2 require Visio Technical or Pro version 5.0c or higher.
Keywords:
References: None |
Problem Statement: The average molecular weight is needed to calculate equivalent and bill of material. How is it calculated for a mixture in Route Selection? | Solution: If you specify the active ingredient in a mixture, then the molecular weight should be: (active ingredient MW)/(mole fraction of active ingredient in the mixture)
If you did not specify the active ingredient, then the molecular weight should be the average MW based on mole fraction
The molecular weight in t... |
Problem Statement: Installation and configuration issues may lead to problems launching Visio Equipment or Block diagrams. | Solution: Either Visio Professional or Visio Technical is required to generate Equipment or Block diagrams in Aspen Batch Plus. Visio Viewer cannot be used to generate diagrams. However, once Visio diagrams are generated, one can use the Visio Viewer to browse the diagrams.
If you encounter difficulties while trying to... |
Problem Statement: How can I retrieve r, q and q' Uniquac parameters? | Solution: The Uniquac r, q, and q' parameters are scalar parameters for each component.
To review parameters, from the main menu, select Tools and Retrieve Parameters Results. The values for r, q and q' will be reported as GMUQR, GMUQQ and GMUQ1 respectively on the Properties | Parameters | Results | Pure Component | S... |
Problem Statement: Why do I get large, unexplained time gaps in the simulation results? | Solution: The facility for the step is can use a non-24 hour calender where certain dates are marked non-working or exception.
Check two places:
The calender assigned to the facility. Go to the Facility tab in the project builder, select the facility and click Edit.
Preferences. If a calender is not specifically assig... |
Problem Statement: What are the different batch movement operations available in Aspen Batch Process Developer (ABPD)? | Solution: Following are the different batch movement operations used in ABPD:
1. Charge: Charge raw material to a unit which may include pure component, a pre-defined mixture or pre-defined cells.
2. Charge-To-Amount: Charge raw materials to an equipment unit, to a certain amount of pure Component, pre-defined mixture ... |
Problem Statement: How to display the default vapor emission model in the Operation, Model dialog? | Solution: In the Operation, Model dialog box, click the equipment tag. You will be prompted Do you want to use the default Vapor Emission models? Click Yes, and the default vapor emission model will be filled in.
Keywords: default, model, vapor mission
References: None |
Problem Statement: How heat of polymerization is calculated in Aspen Plus and layered products Aspen Dynamics and Aspen Custom Modeler? | Solution: Refer to the attached word document.
Keywords: Heat, Polymer, Heat of polymerization, Polymerization, enthalpy.
References: None |
Problem Statement: I have installed some Aspen Plus emergency patches using the .exe file. How do I know what fixes have been installed? | Solution: Go to the Help menu and select View Update Readme to see a list of the fixes addressed in the installed emergency patch.
This list is contained in a file named readme.htm located in the ..\AspenTech\Aspen Plus V7.x folder.
Keywords: None
References: None |
Problem Statement: How is it possible to change icons in Visio for Batch Plus Equipment Diagram? | Solution: You can change the icons used in Visio. Refer to the online help under User Manual/Equipment Diagram/Custom Equipment Stencil. There is one icon for each equipment class.
You can replace the icon with a bitmap of a box or create a new icon in Visio. The stream ports are called connection points. To assign a c... |
Problem Statement: How do I define the stream class for a solid if I want to model it using a Crusher block? | Solution: The Solids unit operation blocks such as CRUSHER require a Conventional (CI) or Nonconventional (NC) solid substream with a particle size distribution (PSD). The stream classes that include these substreams are either CIPSD or NCPSD.
The stream class is specified as MIXCIPSD (or NCPSD) on the Setup | Specific... |
Problem Statement: Is there a way to know what changes have been made in a simulation file? | Solution: There is no built-in functionality that would allow you to look for modifications in the simulation in Aspen Plus. On the other hand, there is a procedure that would allow you to know if there are any differences between two input files from Aspen Plus. First of all, the input files are summaries of the diffe... |
Problem Statement: After checking Estimate missing parameters by UNIFAC on the NRTL or UNIQUAC binary parameter form, the parameters are not estimated for my components that are only in the NIST-TRC databank even though there should be UNIFAC groups for them. Why not? How do I get them to be estimated? | Solution: The UNIFAC groups (UFGRP) are part of the PURExx databanks, but they are not part of the NIST databank. In order to estimate the NRTL or UNIQUAC parameters, the UNIFAC groups need to be entered or generated from the General structure of the component.
To have Aspen Plus attempt to generate the UNIFAC groups:
... |
Problem Statement: How is the Heat of Reaction calculated in Batch Plus? | Solution: Users can use the Calculate button on the Batch Plus Reaction dialog to calculate heat of reaction. This heat of reaction is calculated as the sum of the IDEAL GAS heat of formation for the reactants and products; therefore, it might be far from the actual heat of reaction at given reaction condition.
Conside... |
Problem Statement: How do I split a stream into pure component streams? | Solution: In Aspen Plus the SEP unit operation can be used to separate a stream to pure component streams.
Sep combines streams and separates the result into two or more streams according to splits specified for each component. When the details of the separation are unknown or unimportant but the splits for each compon... |
Problem Statement: How can the Liquid Gibbs free energy of formation (DGLFRM) parameter be accessed using a Calculator Block? | Solution: Parameter DGLFRM is only available for WILS-LR and WILS-GLR property methods, that is why in order to access and use parameter DGLFRM in Calculator block one of these methods has to be chosen for the entire simulation.
Having selected one of these methods, you can find DGLFRM in the Calculator Block Variable ... |
Problem Statement: How is mixture Density or Molar Volume calculated in Aspen Batch Process Developer? | Solution: All mixtures in Batch Plus are considered to be ideal. No calculations are performed for vapor-liquid or liquid-liquid equilibria.
Vapor Phase:
Ideal gas molar volume is calculated from the Ideal Gas Law if a constant density has not been entered by the user.
Liquid Phase:
The liquid mixture density is calc... |
Problem Statement: Is there a complete list of status codes for the field (Aspen.Tree.FindNode('\Data\Results Summary\Run-Status'),12) ?
This is the first field in the panel completion status. | Solution: The following is the list of completion status in hexadecimal.
HAP_RESULTS_SUCCESS = 0x1,
HAP_NORESULTS = 0x2,
HAP_RESULTS_WARNINGS = 0x4,
HAP_RESULTS_INACCESS = 0x8,
HAP_RESULTS_INCOMPAT = 0x10,
HAP_RESULTS_ERRORS = 0x20,
HAP_INPUT_INCOMPLETE = 0x40,
HAP_INPUT_COMPLETE = 0x80,
HAP_INPUT_INACCESS = 0x100,
HAP... |
Problem Statement: Is it possible to add polymer segments to Aspen Custom Modeler or Aspen Dynamics after changing segment list in Aspen Plus?
After creating an Aspen Dynamics file from Aspen Plus, more segments or monomer were need. These were then added in Aspen Plus and add those to the component list, and a new .AP... | Solution: This situation arises because Aspen Custom Modeler and Aspen Dynamics allow the user to apply a subset of the segment list. In general, Aspen Custom Modeler is more flexible in handling the component list compared to Aspen Plus (which has all components in all streams). Aspen Custom Modeler and Aspen Dynamics... |
Problem Statement: Reconciling Physical Property Data in Aspen Plus and Batch Plus | Solution: Currently Batch Plus 2.x and Aspen Plus 10.x use different database structures for storing Physical Property information for components (materials). Aspen Plus stores the pure component property data in a binary proprietary data file whereas Batch Plus stores the data in an Access database. In this document w... |
Problem Statement: For an equation of state model, it seems that the Heat of Vaporization equation is not used. Is this correct? How is the liquid enthalpy calculated in this case? Via the ideal gas heat capacity ? And if so, how does it then calculate the departure term from vapor to liquid, if the heat of vaporizatio... | Solution: Enthalpy of vaporization for a pure component at specified temperature and vapor pressure for the component at that temperature.
The Property set DHVL (enthalpy of vaporization) in V7.1 and earlier reported the difference in enthalpy between vapor and liquid phases at the specified or stream pressure and tem... |
Problem Statement: Is it possible to set the agitator speed during a heat or cool operation in Aspen Batch Plus? | Solution: The agitator speed during a heat/cool operation can only be specified with the VesselPak model (on the Model tab) in the Heat or Cool operation. Once the parameters (such as agitator speed) have been specified under the Advanced button of the Model tab (where the user selects the VesselPak model), those param... |
Problem Statement: Not able to run the automation example file: BatchPlusAutomationExample.doc. | Solution: Make sure that the Batch Plus type library was properly registered. Do this by opening BatchPlusAutomationExample.doc in Word. Press Alt-F11 to open the Visual Basic Editor. Select Tools/
Keywords: v2.1, version 2.1, installation, automation, Exel/VBA model, user model, Excel Model, BatchPlusAutomationExample... |
Problem Statement: How can I increase number of intervals in zone analysis in HEATX? | Solution: You need to change default setting in the HEATX block
1. From the Heatx | Setup | LMTD tab, check Use interval analysis for LMTD calculation then accept the default settings.
2. Run the simulation.
3. From the Heatx | Thermal Results | Zones tab, View drop-down box, select Exchanger zones analysis... |
Problem Statement: How do I use OLI from OLI Systems (http://www.olisystems.com) with Aspen Plus? Do I need to install an interface? | Solution: There is a Readme document for the OLI Alliance Suite for Aspen OLI Interface copied to the installation directories. It is located under:
C:\Program Files (x86)\AspenTech\Aspen OLI Interface Vx.x
The presence of this Readme file indicates that Aspen OLI Vx.x has been partially installed. This ... |
Problem Statement: I have developped a fairly convoluted user unit operation model. When I run the simulation, Aspen Plus reports a severe fortran error in thermodynamic calculations, but I can't spot what might be going wrong.
The error message in control panel is:
Block: B1 Model: USER
*** SEVERE ERROR
FORTRAN INVALI... | Solution: Aspen Plus checks for numerical exception (e.g. division by zero, argument out of range) and report those as severe error as shown above. We do our best to prevent numerical exceptions in our own code, but we believe it is still a good idea to report such errors.
A side effect is that if a numerical exception... |
Problem Statement: I have not found chain-size distribution on stream Results | Poly curves sheet even though Polymer ID is specified on Components | Polymers | Distributions form. Chain size e distribution shows zero on Poly curves sheet. | Solution: The method to track chain length distributions is not valid for all types of reactions. The method assumes that polymer molecules are stable once they are formed, therefore, it is not valid for reversible living polymerisation. It is supported by: Free-Radical, Ziegler-Natta and Emulsion reactions. It is not ... |
Problem Statement: I am simulating a polycondensation reaction in CSTR, my reaction type is step-growth. Can I get the Molecular Weight Distribution (MWD) plot in the product stream? I was told that step-growth reaction mechanism is not fully developed in Aspen Polymer Plus; therefore, MWD plot is not available in it, ... | Solution: The molecular weight distribution (MWD) charts are not supported for IONIC polymerization and STEP-GROWTH polymerization in Aspen Polymers because these are both living polymerizations. The molecular weight distribution charts can be generated for the other types of polymer reactions.
The technical mechanis... |
Problem Statement: Is it possible to open newer files in older versions of Aspen Plus? For example, is it possible to open a V7.1 file in Aspen Plus 2006.5? | Solution: No, this is not possible.
However, starting with version V7.2, Aspen Plus will allow you to open backup files from newer versions, with a warning that features not supported in this version will be lost in doing so.
Keywords: None
References: : CQ00391391 |
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