胺光气化法副产焦油中甲苯二胺分离回收及其鉴别

Separation and Recovery and Identification of Toluene Diamine from Byproduct Tar of Amine Light Gasification

研究了胺光气化法副产焦油的分离工艺及邻、间位甲苯二胺(TDA)组成,采用降膜蒸发技术考察了压力、温度、转速、滴速对焦油中邻、间位甲苯二胺含量的影响,通过正交实验优化工艺条件,对焦油轻重组分中的TDA进行鉴别,优化分析条件.结果表明,优化的分离条件为温度200℃、压力15 k Pa、转速参数30 r/min、进料速率1.5m L/min,该条件下甲苯二胺分离效果最佳,相对标准偏差为1.1%～1.5%.

This work investigated the separation process and contents of ortho toluene diamine（O-TDA）, metra toluene diamine（B-TDA） of by-product tar of amine light gasification. We discussed the effect of the pressure, temperature, speed, dripping speed on O-TDA, B-TDA contents in tar coupling with the falling film evaporation technology. The contents of TDA in the tar were quantitative identified by orthogonal experiment optimization. The results show that the optimal separation conditions are at temperature of 200 ℃, 15 k Pa pressure, rotating speed of 30 r/min, and the feed rate of 1.5 r/min, then the separating efficiency is best with a relative standard deviation of 1.1%-1.5%.