摘要
为解决浓硝硫混酸硝化对硝基甲苯过程中因甲苯的非选择性硝化产生的大量废物和o-M NT对环境的危害,研究了在HZSM-5分子筛催化下,五氧化二氮对甲苯的硝化反应。该方法用N2O5代替浓硫酸,提高了原子经济性,对环境友好。HZSM-5优异的择形性使对硝基甲苯在硝化产物中的比例大幅度提高。考察了反应温度、反应时间,催化剂用量及S i/A l等因素对硝化反应的影响,表明在最佳反应条件下,甲苯硝化反应得率达到42%,对位选择性为78.9%。
In order to solve the problem of synthesizing p-mononitrotoluene involving the concentrated mineral acids as the catalysts, produces huge amounts of wastes along with a large amount of undesired o-MNT due to the nonselective nitration of toluene, the nitration of toluene by N2O5 has been investigated with solid acids catalysts HZSM-5. By the use of new nitrating agent, the reaction eliminated the use of concentrated sulfuric acid and was environmental friendly with high atom economy. The excellent selectivity of HZSM-5 makes the ratio of p-mononitrotoluene increase greatly. Effects of reaction temperature, reaction time, amount of catalyst and the ratio of Si/Al on the nitration were investigated, showing that under optimum conditions, the yield of nitration of toluene was 42%, and para-selectivity was 78.9%.
出处
《火炸药学报》
EI
CAS
CSCD
2006年第5期9-11,共3页
Chinese Journal of Explosives & Propellants
基金
国防科工委"十五"预研项目(40406020103)
兵器科技预先研究项目(zy020102-1)
关键词
应用化学
五氧化二氮
甲苯
绿色硝化
分子筛催化剂
applied chemistry
dinitrogen pentoxide
toluene
clean nitration
molecular sievecatalyst
