Fe_2O_3催化甲基化合成2,3,5-三甲基苯酚及其失活的研究  

Vapor phase synthesis of 2,3,5-trimethyl phenol over iron catalyst and deactivation of the catalyst

作　　者：顾金泉[1] 黄晴[1] 刘纯山[1] 

机构地区：[1]华东理工大学催化研究所,上海200237

出　　处：《工业催化》2006年第12期51-54,共4页Industrial Catalysis

摘　　要：制备并考察了甲醇甲基化法合成2,3,5-三甲基苯酚的固体酸催化剂,进行了甲基化反应工艺条件的优化研究。实验结果表明,最优工艺条件:反应温度370℃、液空速0.2 h-1、n(3,5-二甲基苯酚)∶n(甲醇)∶n(水)=1∶2∶1;原料3,5-二甲基苯酚的转化率达95.96%,目的产物2,3,5-三甲基苯酚的收率为72.01%。并采用XRD、SEM、DTA和TG等测定方法对催化剂进行了研究,发现催化剂表面上积炭污染是造成催化剂活性下降的主要原因。Vapor phase synthesis of 2,3,5-trimethyl phenol from methanol and 3,5-dimethyl-phenol over solid acid catalyst was studied in a fixed bed reactor. Effects of temperature, molar ratio of the feed （3, 5-dimethyl-phenol, methanol and water） and space velocity were investigated. The optimum process condition was as follows ：reaction temperature 370 ℃, space velocity 0.2 h-1, and n（3,5-dimethyl phenol） ： n （methanol） ： n （water） = 1 ： 2 ： 1. 3,5-dimethyl-phenol conversion of 95.96% and 2,3,5-trimethyl phenol yield of 72.01% was obtained under the optimal condition. The catalyst was characterized by XRD, DTA, TG and SEM techniques. The results showed that coke formation was the main cause for catalyst deactivation.

关 键 词：3 5-二甲基苯酚 2 3 5-三甲基苯酚 气相甲基化 氧化铁 催化剂失活 

分 类 号：O643.36[理学—物理化学] O625.31[理学—化学]