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一、前言二甲苯是聚酯树脂、增塑剂等的重要原料。因此迅速而准确地测定二甲苯异构体的含量十分重要。由于这些异构体的性质相近,用一般物理和化学方法很难加以分离和测定。近年来国内外采用气相色谱法取得了较好的效果。通常气相色谱法用单一固定液分离二甲苯异构体效果欠佳。我们试用国产有机皂土与羊毛脂、有机皂土与真空脂Ⅱ号配成的复合固定相对二甲苯异构体进行气相色谱分离,效果较优。柱温高达100℃的情况下仍可将乙苯及二甲苯异构体完全分离。
First, the foreword Xylene is an important raw material for polyester resins, plasticizers and the like. Therefore, it is important to determine the xylene isomer content rapidly and accurately. Due to the similar nature of these isomers, it is very difficult to separate and determine them by common physical and chemical methods. In recent years, gas chromatography at home and abroad have achieved good results. It is usually not effective to separate xylene isomers by single stationary phase in gas chromatography. We try to use domestic organic bentonite and lanolin, organic bentonite and vacuum fat compound No. II fixed composite relative xylene isomers by gas chromatography, the effect is better. Ethylbenzene and xylene isomers can still be completely separated with column temperatures up to 100 ° C.