Optimization and simulation of the extractive distillation process of coking crude benzol hydro-refining

The extractive column and solvent recovery column in original Morphylane extractive distillation process,which used N-formylmorpholine as solvent were combined.By studying the effect of theoretical plate numbers,solvent ratio,feed stage,and temperature of solvent on product recovery ratio with PRO/II software,optimum operating parameters for the new extractive column were obtained.Comparing with the original extractive distillation process,theoretical plate numbers were reduced 5,heat duty of reboiler was saved 4.29%,refrigeration duty of condenser was saved 24.4%.