6 replies to this topic

[Kalp]

Hi,

I am trying to simulate separation of Thiophosgene (CSCl2) and Carbon Tetrachloride (CCl4) in a distillation column using Aspen Plus/Aspen Hysys. The mixture composition is as follows:

CSCl2 = 95 Mass %
CCl4  = 5 Mass %

The target is 99 Mass% CSCl2.

The component CSCl2 is undefined in Aspen Plus/Aspen Hysys, which means there are no pure component (CSCl2) as well as binary properties available.  

My questions are:

Pure component properties of CSCl2 are available in literature. How can I define these properties in Aspen Plus?

Where I can find the binary properties for CSCl2+CCl4 mixture?

How can I separate this mixture (separation method) to achieve the target purity?

Any help or direction would be extremely appreciated.  And don’t hesitate to ask questions if I’ve left out any data.

[Art Montemayor]

Kalp:

 

Please stop making multiple postings of this same topic in the same Forum and in multiple Forums.

 

One Posting of any topic is more than sufficient for our expert, experienced, and capable Forum members.  There is no need for repetition and it only creates chaos, errors, disorganization, and lack of responses because our members don't know which post is the indicated one to respond to.

 

I have removed the other 3 duplicate postings you made.

[MrShorty]

I am not familiar with Aspen, so I cannot readily address the Aspen specific parts of your question.

 

I will note that this copy of the user guide (hopefully not a copyright violation: https://web.ist.utl....UserGuide10.pdf) suggests that information on how to enter property data into the databank may be found in chapter 6 where it talks about entering components and/or chapter 8 where it talks about entering physical property data (the section starting on page 8-9 looks particularly interesting as far as your specific query goes).

 

As for getting binary mixture information, there are three basic sources -- literature, your own experiemental work, or estimation methods like UNIFAC. Do you feel like you have thoroughly searched the literature and found nothing? Do you have resources for getting experimental work performed? Have you explored the suitability of these estimation methods for this binary?

[Kalp]

Art:

 

I am extremely sorry for posting the same query in multiple forums. I will keep this in mind for future.

 

MrShorty

 

With the help of the link provided by you, I was able to define the pure component properties of CSCl2 in Aspen Plus.

 

Regarding binary properties, I searched many literatures  but unfortunately found nothing. Could you please help me in getting binary properties using the UNIFAC/UNIQUAC model?

 

Thank you once again for your help.

[MrShorty]

Might be able to help. What do you need help with in using UNIFAC? Are you uncertain how to get Aspen to use UNIFAC to estimate activity coefficients? Are you having trouble with the equations outside of Aspen? Are you having trouble finding group-group interaction parameters for all groups (I note that my published version of UNIFAC does not list the C=S group)? Some other difficulty in implementing UNIFAC?

[Kalp]

Thank you MrShorty for your prompt reply.

 

I am uncertain how to use UNIFAC model in Aspen plus first to find group-group interaction parameters and then finally binary properties of the mixture. I tried to find some training manuals and literatures but have not found anything useful.

 

Could you please help me in this regard?

 

Thanks!

[MrShorty]

If your question is mostly about Aspen, then I am probably not going to be very much help, as I am rather unfamiliar with the Aspen environment.

 

From the document linked in post #3, I can see on page 6-25 a short section about entering UNIFAC groups, which appears to include the ability to add groups beyond the standard published UNIFAC groups. I assume that somewhere in this is the ability to input group-group interaction parameters.

 

Page 8-9 begins a section on entering parameters into the databank. It does not specifically mention how to enter group-group interactioin parameters for UNIFAC, so I cannot be sure that you have that option. Though, as I noted above, it appears that you are allowed to enter new groups, so I would assume that you would also be able to enter group-group interaction parameters for those groups.

 

Since your question is about doing this in Aspen, I am not sure I can be of much more help than that.