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[Magaby]

Hello, I am simulating a DWC configuration in hysys in a biorefinery process (Petlyuk), but the program does not let me connect a vapour stream that I extract from the main column to connect in the bottoms of the prefractionator because it shows a "Water Pumps Around are not allowed" . The DWC that I am simulating is an Extractive DWC. Thus, I need two condensers and only one reboiler. I have this problem when I want to connect the vapor stream from the main colum to the bottom in the prefractionator. I am using NRTL model and Hysys V8.4. If someone can give me some advice Please. 

[Sarah_Process_engineer]

verify whether the pressure is under the pressure admission in colomn or not.