HYSYS process modeling software was used to analyze the effect of number of trays, feed tray position, and reflux ratio on naphtha and also on atmospheric residue yield. Analysis of data showed that liquid volume percentage yield of naphtha decreased with number of trays and reflux ratio increased. Whereas, in atmospheric residue, the yield increased with the number of trays and the reflux ratio decreased. In addition, the results demonstrated that the production of naphtha increased with feed stage move upper in the distillation column and the atmospheric residue decreased. The study recommends the development of flexible Crude Distillation Unit (CDU) design by which the number of trays and feed position can be changed. The current design does allow for such changes. Flexible design however, calls for flexible pipe work and heat exchanger network as well.
Keywords: HYSYS modeling, crude distillation unit, naphtha production, atmospheric residue production.
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