摘要
针对甲醇芳构化过程中,金属-分子筛催化剂上ZSM-5的择型效应对C2~C5烃不起作用,导致不易转化的烷烃副产物大量生成,单程芳烃收率下降的现状,综述了甲醇芳构化与烷烃芳构化的催化机制与过程特性、多段流化床的结构及其应用,以及多段变温流化床在甲醇芳构化与烷烃芳构化过程的研究进展。在流化床不同的轴向位置,根据起始原料与中间产物的活性,可以采用不同的温度来促进甲醇与烷烃中间体的转化。该技术可有效提高单程芳烃收率,降低后续分离成本和能耗。同时,其中涉及的烷烃芳构化也可能发展成独立的技术,具有广阔的前景。
For the aromatization of methanol with metal-zeolite catalysts, the shape selectivity effect of ZSM-5 is invalid for C2—C5 hydrocarbons, resulting in the formation of by-products(inert alkanes) in large quantities and the decrease of the single pass yield of aromatics. The present work reviewed the catalytic transformation mechanism,the structure of multi-stage fluidized bed reactor and their application, and the progress of the enhanced conversion of methanol and the intermediates(alkanes) with temperature shifting, multi-stage fluidized bed technology. In different axial positions of the fluidized bed, according to the activity of the gaseous reactants and intermediates,different temperatures can be used to promote the conversion of methanol and alkane intermediates. As a result, the single pass yield of aromatics can be significantly improved, as well as reducing the downstream separation cost and energy consumption. In addition, the alkane aromatization involved in it may also be developed into an independent technology for the wide use.
作者
王宏梅
王挥遒
宋文龙
崔超婕
陈兆辉
张晨曦
骞伟中
魏飞
WANG Hongmei;WANG Huiqiu;SONG Wenlong;CUI Chaojie;CHEN Zhaohui;ZHANG Chenxi;QIAN Weizhong;WEI Fei(Department of Chemical Engineering,Tsinghua University,Beijing 100084,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第12期6002-6015,共14页
CIESC Journal
基金
国家重点研发计划项目(2020YFB0606401)。
关键词
甲醇芳构化
烷烃芳构化
多段变温流化床
aromatization of methanol
aromatization of alkane
temperature shifting multi-stage fluidized bed
