Hofmann降解法合成对苯二胺  

Synthesis of 1,4-Benzenediamine by Hofmann Degradation Reaction

作　　者：单玉华[1] 邬国英[1] 魏科年 李为民[1] 

机构地区：[1]江苏石油化工学院化学工程系,江苏常州213016

出　　处：《江苏石油化工学院学报》2002年第3期1-4,共4页Journal of Jiangsu Institute of Petrochemical Technology

基　　金：中国石油化工总公司基金资助 (2 990 0 7)

摘　　要：对由对苯二甲酰胺经Hofmann降解反应合成对苯二胺的过程进行了研究。考察了反应介质、原料配比、NaClO质量分数、反应温度及时间等因素对目的产物收率的影响。结果表明 :投料物质的量配比为对苯二甲酰胺∶NaClO (w =9 1% )∶NaOH =0 0 5∶0 115∶0 2 2 ,反应工艺是先在 12℃反应 75min ,后在 3 5℃反应 1h ,再在 80℃反应 3 0min。结果为反应转化率97 5 %、产品摩尔收率 85 1%。Benzenediamine was prepared by Hofmann degradation of 1,4-benzenedicarboxamide. Factors affecting the reaction result, such as solvent, charge ratio, concentration of sodium hypochloride, reaction temperature and reaction time, were investigated. The suitable charge molar ratio is:1,4-benzenedicarboxamide∶NaClO( w =9 1%) ∶NaOH=0 05∶0 115∶0 22.The reaction was carried out at 12℃ for 75 minutes firstly,35℃ for 1 hour secondly,and 80℃ for 30 minutes finally.The conversion of 1,4-benzenedicarboxamide could reach 97 5% and the molar yield of 1,4-benzenediamine was 85 1%.

关 键 词：Hofmann降解法 合成 对苯二胺 对苯二甲酰胺 

分 类 号：TQ246.3[化学工程—有机化工]