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利用 10 0目～ 2 0 0目的硅胶 ,选择正戊烷和二氯甲烷作为洗脱剂 ,采用吸附色谱法将烷基苯生产中的循环烷烃分离为饱和烃 (烷烃 +环烷烃 )及芳烃两部分。然后将饱和烃及芳烃分别进行色谱 /质谱 (GC/MS)联用分析 ,得到了有关循环烷烃构成的定性定量结果。定性结果如实地反映出烷基苯生产中的副反应产物 ,可直接用于指导生产。从定量结果可以看出 ,经过硅胶吸附分离后 ,试样中含量要求很低的芳烃被浓缩 ,提高了分析的准确度和灵敏度 ,可以检测出循环烷烃中含量很低的物质 ,为全面分析样品组成提供了有力的证据
The objective of the present invention is to separate the cyclic alkanes in the production of alkylbenzenes into saturated hydrocarbons (paraffins + naphthenes) and aromatic hydrocarbons by adsorption chromatography using silica gel of 100 mesh to 200 mesh, using n-pentane and dichloromethane as eluents section. Then the saturated and aromatic hydrocarbons were respectively analyzed by GC / MS. Qualitative and quantitative results about the composition of cyclic alkanes were obtained. Qualitative results faithfully reflect the side reaction products of alkylbenzene production, can be used directly to guide the production. From the quantitative results, it can be seen that after the silica gel adsorption and separation, the aromatic hydrocarbons with low content in the sample are concentrated to improve the accuracy and sensitivity of the analysis, and the substance with very low content in the cyclic alkanes can be detected. In order to comprehensively analyze the samples Composition provides strong evidence