从工业二硝基甲苯中分离2,6-二硝基甲苯的研究

Separation of Pure 2,6-Dinitrotoluene from Industrial Products

首次利用两种不同溶剂分别对同一物系进行结晶的方法从工业二硝基甲苯中分离2,6 二硝基甲苯,得到纯度较高的2,6 异构体。改进乙醇结晶的工艺条件,得到最佳的结晶浓度,降低成本;对硫酸结晶温度的影响进行测定,得到最佳结晶温度范围。

2,6dinitrotoluene was separated from a mixture of 2,4and 2,6dinitrotoluene by a joint crystallization method. The method resolves effectively the separation and purification problems, which are difficult to be overcomed by recrystallization. The technological condition was improved by a series of experiments using different concentration of ethyl alcohol and get the best temperature by recrystallization with sulphuric acid in different temperatures.