12 replies to this topic

[baiecesi]

Hello, I have a problem with using "Triolein" in Aspen Plus.When I try to run the flowsheet , the following message appeare ,and then the run stop. I have tried use different property model such as UNIQUAC, NRTL, but same error occurs. I would like to know if I want to use triolein to react with methanol, is it any other datas I need to check before I can run the simulation? Thank you.

Calculations begin ...

*** SEVERE ERROR IN PHYSICAL PROPERTY SYSTEM
IDEAL GAS MODEL HAS MISSING PARAMETERS:
CPIG/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT C57H1-01

****PROPERTY PARAMETER ERROR
ERRORS ENCOUNTERED IN CALCULATION OF IDEAL GAS PROPS FOR
HIG
PLEASE FIX THE ERRORS, RE-INITIALIZE, AND RUN AGAIN.

! Calculations stopped because of missing property parameters

[chuanqi]

I have the same problem and it seems that we are taking part in the same issue. how about commulicating directly?by msn?

[Deepak Semwal]

please check if the databank of the simulation software contains triolein listed.

[chuanqi]

please check if the databank of the simulation software contains triolein listed.

yes. but, it seems that the databank of property is lack

[riven]

You will need to enter custom data in the database for this component. Otherwise use common sense (force it to go where it should) or ignore it.

[chuanqi]

You will need to enter custom data in the database for this component. Otherwise use common sense (force it to go where it should) or ignore it.

The acquired data such as the NRTL parameter are inputed, and it tells me that"IDEAL GAS MODEL HAS MISSING PARAMETERS:CPIG/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT TRIOL-01"
","ERRORS ENCOUNTERED IN CALCULATION OF IDEAL GAS PROPS FOR HIG"
Could you follow this alarm and tell me how to input the missing data?

[riven]

Your best best if you wish to include:

In aspen plus go to compoments.
Go to user defined.
Enter name etc and select conventional (other options may apply) and click next.
Input as much data as you can such as boiling points, Molecular weight etc. There will also be tabs for molecular structure (4 options) etc.

Assuming everything is input correctly, Aspen will generate an estimation of your parpameters. I would suggest doing this for water and checking it against actual water to see if you are doing it correctly.

[chuanqi]

Good idea! But I plan to assume this parameters by themodynamic formula though it means heavy calculation.

[riven]

I think that option is also available by doing it this way, you can specify various thermo properties but I have never gone that far.

As for your other question what to use to catalyse, sorry cannot help.

[chuanqi]

use enzyme to catalyse.

[garto87]

I found the solution to your CPIG error problem. Basically the system is looking for ideal gas heat capacity, except it is highly unlikely you will be encountering any vapors unless you're running your triolein at temperatures above 500 degrees Celsius. The solution would be to force Aspen to calculate everything using no vapor pressure for triolein which is fairly accurate. This can be accomplished as follows:

In Specifications highlight your triolein and click the "User Defined" button below.

A dialog box comes up, hit next, then OK twice. Click next again.

You should be looking at a box that has buttons for Liquid Density, Vapor Pressure Data....

Click on button 3, "Extended Antoine Vapor Pressure Coefficients"

Click the field in row "1" and input "-1E20"

Hit finish and run the simulation again.

Basically -1E20, besides being a ridiculously large negative number for vapor pressure, acts as a flag for Aspen telling it disregard vapor pressure for this component. Your simulation should run, also, it might be in your best interest to get rid of all your other user defined data for Triolein as it may foul up other calculations.

[chuanqi]

thanks! it is a perfect solution. and I want to know whether you are doing the same simulation?

[katherine04]

thanks
simulation rachat de credit