7 replies to this topic

[Mohammad Bakhsh]

    Hi,

 

 

i am simulating extractive distillation for ethanol dehydration using Hysys. so for i have simulated extractive distillation column .but it is not converging,it goes through thousands of iterations and at last it shows unconverged. May i get some hint and guidelines to converge it, Hysys file is attached.

[Bobby Strain]

You can relax the convergence criteria. Before you do that, modify some parameter to relax the separation requirements. And, you want to be sure that your feed is near 95% ethanol or greater. I presume that you selected the proper properties package. If you have access to AspenTech's support site, look for help there.

 

Bobby

[Mohammad Bakhsh]

thank u sir for your reply.i will check it as per ur guidelines.

[Mohammad Bakhsh]

sir i have got it converged but not getting the required recovery of ethanol,water and eglycol.

Have a look at the case its link is given below.

 

http://www.mediafire...7/converged.rar

Edited by Mohammad Bakhsh, 24 December 2015 - 09:07 AM.

[Bobby Strain]

I don't have software to view/run your file. But, now that you have a converged solution change the parameters gradually to achieve the results you want.  Be sure to save the case that is converged.

 

Bobby

[Mohammad Bakhsh]

thank you very much sir.

[Bobby Strain]

Did you get your results?

 

Bobby

[Mohammad Bakhsh]

yes sir ,i got the results. 

Thank u