连续硝化制备2,5-二氯硝基苯的工艺研究  

Study on Preparation of 2,5-Dichloro Nitrobenzene by Continuous Nitrification

作　　者：刘东[1] 

机构地区：[1]沈阳化工研究院有限公司,沈阳110021

出　　处：《农药》2017年第12期878-881,共4页Agrochemicals

摘　　要：[目的]研究釜式串联连续硝化制备2,5-二氯硝基苯的工艺方法。[方法]采用自制的三釜串联硝化反应装置进行对二氯苯连续硝化反应研究。[结果]当混酸组成为W(硫酸)57.52%,W(硝酸)39.19%,W(水)3.29%,1,4-二氯苯与混酸的流量比为5:4,1#、2#、3#釜的温度分别为70、85、85℃,停留时间大于25 min时,出料的产品含量可达到97%以上。[结论]连续硝化反应效果与间歇一致,但效率是间歇反应的14倍。[Aims] This paper aims to study the process method for preparing 2,5-dichloronitrobenzene by serial nitration of three pots. [Methods] A continuous nitrification reaction of p-dichlorobenzene was carried out with a self-made three pots series nitration reactor. [Results] The content of the discharged product can reach more than 97%, when the mixed acid composition of W（H_2SO_4）=57.52%, W（HNO3）=39.19%, W（H_2O）=3.29%, flow ratio of 1,4-dichlorobenzene and mixed acid was 5：4, the temperature of 1#, 2#, 3#, kettle was 70, 85 and 85 ℃, respectively, the residence time exceeded25 minutes. [Conclusions] The effect of continuous nitration is consistent with intermittent reaction, but the production efficiency is 14 times.

关 键 词：2 5-二氯硝基苯 三釜串联 连续硝化 

分 类 号：TQ246.13[化学工程—有机化工]