HZSM-5分子筛催化苯和甲醇甲基化反应研究  

Study on Methylation Reaction of Benzene and Methanol with HZSM-5 Molecular Sieve Catalyst

作　　者：王雨勃[1] 王月梅[1] 龚燕芳[1] 李华英[1] 

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,201208

出　　处：《石油化工技术与经济》2014年第4期30-35,共6页Technology & Economics in Petrochemicals

摘　　要：通过XRD、ICP、BET、NH3-TPD等表征手段,对不同规格的HZSM-5分子筛的理化性质进行表征,并在连续流动固定床微型反应装置上进行了反应性能研究。结果表明,硅铝比、结晶度以及晶粒尺寸都对苯和甲醇甲基化反应行为有显著影响,硅铝比越高,其水热结构稳定性越好;一定的硅铝比、结晶度高、晶粒度约为1 000 nm的HZSM-5分子筛催化剂对于苯和甲醇甲基化反应具有较好的综合催化效果:在400℃、0.5 MPa、苯空速4.0 h-1、氢苯物质的量比1.0、苯醇物质的量比2.0的条件下,甲醇转化率为99.92%,苯转化率为27.09%,甲苯和二甲苯总选择性为58.32%。The physical and chemical performance of HZSM - 5 molecular sieve of different specifications were characterized by XRD, ICP, BET and NH3 - TPD, and reaction performance of the molecular sieve were studied in the continuous flow fixed bed micro reactor. Result showed that the ratio of silica - alumina ratio, degree of crystallinity and size of crystal grain had obvious effects on the methylation reaction behavior of benzene and methanol. The higher the silica -alumina ratio, the hydrothermal stability was better, and HZSM -5 molecular sieve catalyst with certain silica - alumina ratio, high degree of crystallinity and crystal grain size number of 1 000 nm had good comprehensive catalytic effects on the methylation reaction ： at the conditions of 400 ℃, 0.5 MPa, benzene air speed of 4. 0 h-1, hydrogen - benzene molar ratio of 1.0, benzene - methanol molar ratio of 2. 0,the conversion rate of methanol reached 99. 92% ,conversion rate of benzene was 27.09% ,and the total selectivity of toluene and xylene was 58.32%.

关 键 词：ZSM-5分子筛 二甲苯 甲基化 

分 类 号：TQ241.13[化学工程—有机化工]