I am trying to simulate a crude unit in Hysys. Presently THe unit has two pump arounds. One is Kero and other is HGO. We plan to revamp this unit for better heat recovery and withdrawal of a heavy Naphtha of cut range 140-180 for direct feeding as CRU feed. Crude is llight API of 40. While simulating I am getting a condenser temeprature of -50 deg C. So I have practically two questions:-
1. Is it pratically possible in a crude column to get a 140-180 cut from the column and even then maintain the Kero/ATF flash points.
2. I am not able to converge the column with condenser temperature of say 40 deg C.
I am attaching the proposed case as attachement.
Any help would be useful.