3 replies to this topic

[marie_02]

Hi! I've been trying to simulate four distillation columns for ethanol dehydrogenation using ASPEN Hysys version 11. I've already simulated the distillation columns but whenever I try to recycle it in the feed it won't converge. Can someone help me or give me some hint or guidelines for it to converge. Thank you!

 

 

[Bobby Strain]

You need to post your flowsheet. The first thing to try is to simulate using a dummy recycle stream without a recycle block. You probably mean dehydration, i.e. water removal.

 

Bobby

Edited by Bobby Strain, 16 June 2021 - 10:33 PM.

[marie_02]

Thank you sir for the reply. I already tried using a recycle stream and I still can't get the required compositions. Here is the link of what I'm trying to simulate  https://docplayer.ne...rogenation.html

Edited by marie_02, 17 June 2021 - 12:53 AM.

[Bobby Strain]

Adjust the tolerances of the recycle block. Loosen the requirements until you get a converged solution. Then tighten them.

 

Bobby