【摘要】 <正> 硝基氯苯是重要化工原料,但常常是三种异构体的混合物,在生产和使用中往往要求控制和测定各异构体的含量。气相色谱法是分离和测定三种异构体的较好方法。在文献中对这三种异构体的分离已有一些报道。南京化工厂用己二酸乙二醇聚酯分离和测定这三种异构体,但分析周期较长。我们曾用芳羧酸酯液晶成功地分离和测定了一硝基甲苯的三个异构体和二叔丁基二茂铢的更多还原

【Abstract】 A detailed study of separation of the positional isomers of chloro-nitro-benzene by gas chromatography is described using columns packed with p-phenylene-di-n-alkoxybenzoate and ordinary liquid phases on Celite at 130℃. Relative retention values of the isomers on each stationary phase were determined. It was found that no liquid crystal could effectively separate these isomers. However. they can be completely separated on a 1.5m×0.35cm column packed with 5% PEG 20M on Celite, and relative retention values of o-isomer/p-isomer and p-isomer/m-isomer are. 1.31 and 1.20 respectively. A procedure for the quantitative determination of the m-isomer was developed.更多还原