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对氯甲苯选择性氧化制备对氯苯甲醛
南京大学化学化工学院,江苏 南京 210023
Selective Oxidation of p-Chlorotoluene to p-Chlorobenzaldehyde
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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摘要 为实现绿色、高效生产对氯苯甲醛,采用氧气氧化对氯甲苯选择性制备对氯苯甲醛,选择以MC(Mid-Century)催化剂为基础催化剂,醋酸作溶剂,筛选助催化剂,探究对氯甲苯转化率和对氯苯甲醛收率的影响因素,并设计正交实验获取优化反应条件。结果表明反应温度为80 ℃,催化剂用量为对氯甲苯质量的4%,钴盐和锰盐质量比为3:1,对氯甲苯和醋酸体积比为1:2,助催化剂用量为对氯甲苯质量的0.625%时,对氯甲苯转化率可达31.42%,对氯苯甲醛的选择性达81.14%。在此基础上,通过反应动力学计算,得到了各温度下的反应速率常数和反应活化能。
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魏世明
胡家明
薛 艺
张 锋
关键词 对氯甲苯对氯苯甲醛液相氧化动力学    
Abstract:In order to achieve green and efficient production of p-chlorobenzaldehyde (PCAD), PCAD was selectively prepared by oxidation of p-chlorotoluene (PCT) with O2. MC(Mid-century) catalyst was used as the base catalyst and acetic acid was selected as the solvent. The effects of co-catalyst and other factors on PCT conversion and PCAD selectivity were investigated. Then orthogonal experiments were designed to obtain optimized reaction conditions. The results showed that when the reaction temperature was 80 ℃, the amount of catalyst used was 4% by mass of PCT, the mass ratio of cobalt salt and manganese salt was 3:1, the volume ratio of PCT and acetic acid was 1:2, and the amount of co-catalyst was 0.625% by mass of PCT, the conversion of PCT could reach 31.42%, and the selectivity of PCAD can reach 81.14%. On this basis, the reaction kinetics was studied, the reaction rate constant and reaction activation energy were obtained.
Key wordsp-chlorotoluene    p-chlorobenzaldehyde    liquid phase oxidation kinetics   
收稿日期: 2019-11-20     
基金资助:国家自然科学基金项目(21776122)。
作者简介: 魏世明(1998—),男,硕士研究生;张 锋(1979—),男,副教授,通讯联系人。E-mail:zf@nju.edu.cn。
引用本文:   
魏世明,胡家明,薛 艺等. 对氯甲苯选择性氧化制备对氯苯甲醛[J]. 化学反应工程与工艺, 2020, 36(1): 60-67.
WEI Shiming,HU Jiaming,XUE Yi et al. Selective Oxidation of p-Chlorotoluene to p-Chlorobenzaldehyde[J]. 化学反应工程与工艺, 2020, 36(1): 60-67.
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