浙石化催化裂化汽油及石脑油加工流程的优化

Optimization of catalytic cracking gasoline and naphtha processing flow

介绍了浙江石油化工有限公司对催化裂化汽油、石脑油加工流程的优化调整过程及效果。优化调整过程:利用已有装置灵活调整优化原料加工,解决了直馏石脑油加氢能力不足的问题,并增加了重整装置原料量,汽油与芳烃生产灵活性得以大幅度提高。对预处理、轻汽油醚化和S Zorb装置进行局部改造,预处理单元中原汽油分馏塔更换为隔壁塔。利用隔壁塔技术对催化裂化汽油进行三组分分离,原塔顶冷凝系统及塔底重沸炉利旧无需改造,使分离能耗比常规两塔分离方案降低约30%。通过对催化裂化汽油精制和石脑油加工流程的优化调整,解决汽油苯含量高导致汽油难以减产的问题,当需要减产汽油时,成品汽油可减产约38%,提高了石脑油加氢处理能力及全厂生产灵活性。

Zhejiang Petroleum&Chemical Co.,Ltd.has optimized and adjusted the processing flow of catalytic cracking gasoline and naphtha.By utilizing existing equipment to flexibly adjust and optimize feedstock processing,the contradiction of insufficient hydrogenation capacity of straight run naphtha has been alleviated,and the amount of reforming unit feed has been increased,greatly improving the flexibility of gasoline and aromatic hydrocarbon production.Partial modifications are made to the pretreatment,light gasoline etherification,and S Zorb units,with the original gasoline fractionation tower in the pretreatment unit replaced with a dividing wall column(DWC).Using DWC technology for ternary separation of catalytic cracking gasoline,the original tower top condensation system and bottom reboiler can be reused without modification,reducing separation energy consumption by 30%compared to conventional two tower separation.Through the optimization and adjustment described,the contradiction between high benzene content in gasoline and the need to reduce gasoline production can be effectively alleviated.The finished gasoline can be reduced by about 38%,improving the hydrotreating capacity of naphtha and the flexibility of the entire plant production.