固体酸催化F-C酰基化反应脱除焦化苯中的噻吩  

Separating Thiophene from Coking Benzene by Friedel-Crafts Acylation Reaction over Solid Acids

作　　者：牛丛丛[1] 曹学普[1] 陈莉君[1] 曾爱武[1,2] 

机构地区：[1]天津大学化工学院,天津300072 [2]化学工程联合国家重点实验室(天津大学),天津300072

出　　处：《化学工业与工程》2012年第3期11-16,共6页Chemical Industry and Engineering

基　　金：国家科技支撑项目(2007BAB24B05)

摘　　要：采用Friedel-Craft反应,乙酸酐作为酰化剂,对焦化苯进行脱硫精制。通过对比MCM-41、HZSM-5和Mont-K10及其负载型催化剂的催化活性,发现未负载型Mont-K10具有最高的催化活性,并且随着ZnCl2负载量的增大,催化活性反而降低。采用FT-IR对固体酸催化乙酰化反应机理进行探讨,发现固体酸表面的L酸是此反应的活性中心,负载ZnCl2不仅能改变酸位的数量而且能改变酸的强度。通过对反应条件进行优化,转化率可以达到99.4%。对Mont-K10催化寿命的考察结果表明,经过3次再生还原,催化剂的催化活性仍能恢复,转化率仍在90%以上,只不过处理量减少为原来的一半。Fine desulfurization of coking benzene was studied via Friedel-Crafts acylation reaction with acetic anhydride as acylating agent.Catalytic activity of several solid acids,such as MCM-41,HZSM-5,Mont-K10,and their supported catalysts was tested.We found that Mont-K10 had the highest catalytic activity,and its catalytic activity decreased with the increase of the ZnCl2 loading.The mechanism of acetylation catalyzed by solid acid was investigated by FT-IR technique.The results revealed that Lewis acid was the active site for this acylation reaction and the loading of ZnCl2 led to the increase in both the amount and the strength of acid sites.Under the optimum conditions,thiophene conversion rate reached 99.4%.After regeneration for three times,the catalytic activity was recovered and the conversion rate was still up to 90%,though the treatment capacity decreased to half.

关 键 词：焦化苯 噻吩 2-乙酰噻吩 固体酸催化剂 

分 类 号：TQ251.2[化学工程—有机化工] TQ032.4