Chemstations - CHEMCAD

Very good information about this article...

2010-07-19T09:28:39.555-05:00

Very good information about this article...

You can always call the Technical Support staff at...

2010-05-14T10:00:53.365-05:00

You can always call the Technical Support staff at 1-800.243.6223 or e-mail support@chemstations.com

Sulfolane extraction of Aromatics can surely be Si...

2010-05-14T05:50:00.454-05:00

Sulfolane extraction of Aromatics can surely be Simulated in Chemcad. You will need to regress some of BIPs. Just few data points are good enough for the missing pairs...

Is it possible to comunicate directly with expert ...

2010-04-20T15:23:28.664-05:00

Is it possible to comunicate directly with expert staff? who to do it, thank you.

Can we do Sulfolane extraction of Aromates with CH...

2010-03-23T01:31:54.485-05:00

Can we do Sulfolane extraction of Aromates with CHEMCAD?

As a test of Oleg's comment, I created a simple ab...

2009-12-04T13:27:52.706-06:00

As a test of Oleg's comment, I created a simple absorber.
Inlets are both at 50F and 14.7
Inlet liquid:
100 lbmol/h water
10 lbmol/h formaldehyde

Inlet vapor:
10 lbmol/h formaldehyde
10 lbmol/hr nitrogen

the outlet liquid is at 158F with an enthalpy of -13.69559 MMBTU/Hr its a 25% wt solution of Formaldehyde

Oleg, you should probably talk to your support rep...

2009-12-04T13:21:51.143-06:00

Oleg, you should probably talk to your support rep on this. I'm not sure what your column composition is, but the enthalpy model seems fine when I run the maurer model.

For formaldehyde, I don't recomend ESD and HTS, but you should be able to use a HTS file there

I use last version 6.2.0.3348 of Chemcad. When Whe...

2009-12-02T02:15:01.924-06:00

I use last version 6.2.0.3348 of Chemcad. When When I use Maurer model the entalpy calculation of the column outlet streams is not correct (calculated enthalpy is -1.#QNAN).
Beside that when I use ESD model during formaldehyde calculation I am not able to add HTS file.
Oleg Pajalic (oleg.pajalic@perstorp.com)

Hello: First, I wanted to thank you for developin...

2009-11-25T10:50:45.989-06:00

Hello:

First, I wanted to thank you for developing a so useful program, I have learnt a lot from it, when I was only a student I didn't have the chance to use it, but now that I am working for a petroleum refining company I see that Chemcad is a program that can give you wondrous results about refining process. I use it in conjunction with Honeywell's RPMS and both programs make my daily tasks easier.

Regards.

Niels Mejia Ibarra

Dpd18 Welcome in! For questions like this, it's be...

2009-10-16T14:53:52.476-05:00

Dpd18
Welcome in! For questions like this, it's best to contact technical support at 1800CHEMCAD (press option 2), or via email at support @ chemstations.com
When you're doing the regression, be sure to checkmark the option which is labeled something like "use three phase algorithm for TPXY regression."
When you are shown the initial bip estimates (B12, B21, Alpha, A12, A21) you will notice that we only give initial bounds and values for B12,B21, and alpha. You could give initial values and bounds of -100 to 100 for the other two bips to let CHEMCAD try a 5 parameter regression.
If you're still having trouble...I would encourage you to contact technical support, and we will help you sort it out.

David, I briefly searched the site for your conta...

2009-10-16T09:49:09.436-05:00

David,

I briefly searched the site for your contact information, but was unsuccessful. So I'm hoping this tactic of posting a comment will reach you.

My name is David Disciascio; I am a new chemical engineer for Westinghouse Electric. I have recently encountered a slightly similar problem with CHEMCAD: I have found that the know data for the solubility of MIBK in water and vice versa does not match previous known experimental data by a co-worker. I have tried to solve this problem by regress the BIPs with the experimental data, although to no success. I am using the NRTL K value model in thermodynamic settings; with vapor/liquid/liquid/solid global phase setting selected. The new CHEMCAD results are closer, but still off by a factor of three! (closest) Do you have any suggestions to fixing the problem?

-Dave D