Abstract: Aspen HYSYS software was used to simulate the process of C₄/C₅ fractionating column (T202) for 1.2 Mt/a continuous reforming unit in SINOPEC Luoyang Company. The ideal model which was close to the actual operation of the device was obtained. The bottom temperature and feed temperature were optimized by the model. The influence of bottom temperature on the vapor pressure of chemical light oil and the effect of feed temperature on the hydraulic operating point of the tray were investigated. The results showed that with the increase of bottom temperature of T202 from 135.5 ℃ to 138.5 ℃，the vapor pressure of chemical light oil at the bottom of the column decreased from 96.71 kPa to 88.76 kPa, and the operating cost was saved by 4.5 million yuan per year as the chemical light oil fractionating column C201 could be discontinued. With the increase of feed temperature to 102 ℃，all plate hydraulics operation points were in the optimum operation area, and the separation accuracy of the column was improved.

Key words: process simulation, continuous catalytic reforming, C4/C5 seperation, Parameter optimization