MTBE-C_4-甲醇的蒸馏-渗透汽化集成分离过程设计

DESIGN OF INTEGRATED PROCESS OF DISTLLIATION AND PERVAPORATION FOR THE SEPARATION OF MTBE - C_4 - METHANOL MIXTURE

国内现有甲基叔丁基醚（MTBE）生产装置20余套,年生产能力约50万t,分化工及炼油型2种工艺路线。1994年以前建成的大多采用筒式反应器技术,1994年以后则以齐鲁石化公司研究院开发的预反应加催化蒸馏技术为多。无论是化工型还是炼油型工艺路线,无论是采用筒式反应器还是催化蒸馏技术,最后均需用水洗工艺将C_4中的甲醇脱除,此工艺设备投资大、操作繁、耗能高。渗透汽化（PVAP）膜分离是近十几年来颇受注目的一项新型膜分离技术,具有一次性分离度高、设备简单、无污染、低能耗等优点。

The design and calculation of the integrated process of distillation and pervaporation for the separation of MTBE/C4/methanol mixture was carried out with the HYSIM modeling system. The component concentration profiles and temperature distributions in the distillation column were obtained. The integrated process for different draw streams taken from the distillation column was also calculated. The results show that the integrated process with side draw stream is much better than that of the stream taken from the top of the distillation column. The methanol mole fraction in the top product was reduced to 9.07 × 10 - 5 for the integrated process. The water scrubbing process was eliminated and much energy could be saved in comparison with the conventional process.