对二甲苯高效选择性氧化合成对甲基苯甲酸  

Synthesis of P-Toluic Acid by Efficient Selective Oxidation of P-xylene

作　　者：章丽 冯永胜 袁鹏 Zhang Li;Feng Yong-sheng;Yuan Peng

机构地区：[1]浙江圣效化学品有限公司,浙江衢州324000

出　　处：《化工设计通讯》2020年第12期49-50,共2页Chemical Engineering Design Communications

摘　　要：研究了对二甲苯液相催化氧化选择性制备对甲基苯甲酸的新工艺。在筛选出适宜钴盐催化剂基础上,主要考察了影响对二甲苯转化率和氧化产物选择性的因素:催化剂浓度、氧气流量和反应时间等,获得了优化的反应条件。结果表明,钾盐或钠盐等对甲基苯甲酸盐助催化剂的加入,可显著抑制氧化产物中酯的生成,减少反应体系中的高沸物。This paper studies a new process for the selective preparation of p-toluic acid by liquid phase catalytic oxidation of p-xylene.Based on the selection of suitable cobalt salt catalysts,the factors affecting the conversion of xylene and the selectivity of oxidation products were mainly investigated:catalyst concentration,oxygen flow rate and reaction time,etc.,and optimized reaction conditions were obtained.The results show that the addition of p-toluate promoters such as potassium salt or sodium salt can significantly inhibit the formation of esters in the oxidation products and reduce the high boilers in the reaction system.

关 键 词：对二甲苯 氧化合成 对甲基苯甲酸 

分 类 号：TQ245.12[化学工程—有机化工]