关键词: 芳烃异构化装置, 冷高分工艺, 热高分工艺, 循环氢纯度, 能耗

Abstract: Taking the aromatics isomerization unit of a factory as research object, the differences between the cold and hot high pressure separation processes are briefly introduced. The purity of recycle hydrogen, equipment investment, energy consumption and operation cost of the two separation processes are compared based on the PROⅡ simulation results. Compared with cold high pressure separation process, although the purity of recycle hydrogen decreases, the increase of dissolved hydrogen will lead to a slight increase of make-up hydrogen. However, the heat-exchange process of hot high pressure separation process is more reasonable, and the steam consumption of deheptanizer reboiler reduces greatly with the increase of feed temperature of deheptanizerd. By adopting the hot high pressure separation process, the equipment investment can be reduced by 1.054 million yuan, the energy consumption can be reduced by 107.1 MJ/t, the annual operation cost can be saved by 12.97%, and the overall income of the unit can be increased. In general, hot high pressure separation process is suitable for aromatics isomerization unit.

Key words: aromatics isomerization unit, cold high pressure separation process, hot high pressure separation process, purity of recycle hydrogen, energy consumption