二氧化氮为硝化剂的苯硝化反应  

STUDY ON BENZENE NITRATION BY NO_2

作　　者：苑保国[1] 安华良[1] 赵新强[1] 

机构地区：[1]河北工业大学化工学院绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《精细石油化工》2010年第5期28-31,共4页Speciality Petrochemicals

基　　金：河北省科学技术研究与发展计划项目(072421107D)

摘　　要：以溶胶-凝胶法制备的负载型磷钨杂多酸为催化剂,分别在常压和加压条件下,优化了NO_2代替硝酸作为硝化剂的苯液相硝化反应条件。对于常压反应,在m(催化剂):m(苯)=1:12、NO_2气体流速为10 mL/min、O_2流速为5 mL/min、反应时间为8 h、反应温度为60℃的件下,硝基苯收率为29.5%。对于加压反应,适宜的反应条件为:n(NO_2)n(苯)=2.5:1,w(催化剂)=3.5%,O_2初始压力1.0 MPa,反应温度90℃,反应时间6 h。在此条件下,硝基苯收率为41.8%。The nitration of benzene by NO2 instead of nitric acid over Ha PW12 O40/ SiO2 catalyst prepared by a sol-gel technique was conducted separately in an atmosphere reactor and in an autoclave. The experimental results indicated that under the atmospheric conditions, the weight ratio of the catalyst to benzene of 1 ： 12, flowrate of NO2 10 mL/min, flowrate of 02 5 mL/min, reaction temperature 60 ℃ and reaction time 8 h, the yield of nitrobenzene achieved 29.5 %, while the yield of nitrobenzene was 41.8% in an autoclave under the conditions of molar ratio of NO2 to benzene 2.5 ： 1, weight percentage of the catalyst 3.5 %, initial pressure of 02 1 MPa, reaction temperature 90 ℃, and reaction time 6 h.

关 键 词：二氧化氮 苯 硝化反应 硝基苯 

分 类 号：TQ426.94[化学工程]