分立冲洗式模拟移动床吸附分离对二甲苯

摘要

A new simulated moving bed(SMB) process was developed for producing high purity para-xylene(PX),and was applied to a demonstration plant of PX adsorption separation with 30 kt/a capacity.The bed line flushing of SMB and bed numbers of four sections were studied and optimized.The experiment results show that the new process had better performance,the PX purity is more than 99.7％,and the recovery of PX is more than 97％.The factor of bed line flushing 3 has obvious effect on PX purity.Time-division flushing of C2 and C3 was feasible.The optimized bed numbers of four sections(desorption section,purification section,adsorption section,buffer section) was 5,10,6,3.%开发了用于生产高纯度对二甲苯(PX)的模拟移动床吸附分离工艺,并应用于30 kt/a PX吸附分离示范装置,对工艺床层管线冲洗进行了优化,对高效床层管线冲洗和功能区床层数配置进行了研究.实验结果表明,所开发的吸附分离工艺具有先进性,采用开发的吸附分离工艺可获得纯度99.7％以上的PX产品,单程收率可达97％以上;C3冲洗对产品纯度有重要影响,C2和C3分时冲洗方案较优;提纯区床层数对于提纯效果有显著影响,脱附、提纯、吸附、缓冲各区5,10,6,3的床层数配置是最优方案.