甲苯三氧化硫磺化反应抑制副产物二甲苯砜的研究  

Inhibition of Dimethyldiphenyl Sulfone Formation during Sulfonation of Toluene with Gaseous Sulfur Trioxide

作　　者：颜范勇[1] 汪宝和[2] 井欣[2] 张德利[2] 刘邦孚[2] 袁继堂[2] 

机构地区：[1]天津大学药物科学与技术学院 [2]天津大学石油化工技术开发中心,天津300072

出　　处：《染料与染色》2004年第5期276-278,共3页Dyestuffs and Coloration

基　　金：天津市科委重大攻关项目(No.003101711)

摘　　要：对SO3磺化甲苯反应的副产物二甲苯砜成因及反应历程进行了分析,通过实验比较了醋酸与二甲苯砜的抑制效果,提出用磺化副产物二甲苯砜自身抑制的新方法。考察了二甲苯砜加入量和甲苯转化率对抑制副反应的影响。反应温度:10℃,三氧化硫:6％,甲苯转化率为35％时,外加甲苯质量3.3％的二甲苯砜就能控制二甲苯砜含量不增加,且甲苯磺酸异构体的对位含量由84％上升到89％,间位含量由2.5％下降到1％。The formation of dimethyldiphenyl suifone, a by-product from sulfonation of toluene with SO3, and its reaction mechanism was investigated. The inhibitive effects of acetic acid was compared with that of dimethyldiphenyl suifone, and a new method using the suifone as a self-inhibitor was presented. The effect of dosage of dimethyldiphenyl suifone and conversion of toluene on inhibiting the formation of the by-products were studied. When the reaction temperature was 10℃, the concentration of SO3 was 6% and the conversion of toluene was 35%, the formation of dimethyldiphenyl suifone would have well inhibited by adding 3.3% dimethyldiphenyl suifone based on the weight of toluene used, the content of p-toluenesulfonic acid was increased from 84% to 89%, and of the m-isomer decreased from 2.5% to 1%.

关 键 词：磺化 甲苯 三氧化硫 对甲苯磺酸 二甲二苯砜 

分 类 号：O625.7[理学—有机化学]