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采用质谱法对洗化厂生产出的重烷基苯进行分析 ,得到了重烷基苯组成的重建离子流图 ,根据重建离子流图 ,分别选择从壬烷基苯到二十一烷基苯作为分子离子做质量色谱图 ,也就是进行混合物中的单离子检测 ,同时对单离子组份的峰面积采取积分 ,将积分后的峰面积归一化处理就得到了重烷基苯中有关单烷基苯、二烷基苯、多烷基苯的相对组成含量。在获得的 1 3种化合物结构组成中 ,十二烷基苯和十三烷基苯的含量较高 ,分别为 2 3 %和 5 3 %。其中的产品烷基苯 ,即葵烷基苯～十三烷基苯含量为 85 % ,这说明从重烷基苯中还可以分馏出一部分产品。从整个分析结果来看 ,质谱法测量范围的精确度高 ,可行性强 ,重复性好 ,所得分析数据对重烷基苯的开发、利用具有指导作用。同时质谱法克服了气相色谱法中受柱温条件限制的不足 ,在重质混合物分析中有独到之处。
Mass spectrometry was used to analyze the heavy alkylbenzene produced in the washing plant to obtain the reconstructed ion flow diagram of the heavy alkylbenzene composition. According to the reconstructed ion flux map, from the nonylbenzene to the nonylbenzene As a molecular ion mass chromatogram, that is, the single ion detection mixture, while the single ion peak area to take an integral, the peak area after the integration of the normalized to get heavy alkyl benzene in the relevant single Alkyl benzene, dialkyl benzene, polyalkylbenzene relative compositional content. Among the 13 compounds obtained, the contents of dodecylbenzene and tridecylbenzene were 23% and 53% respectively. Among them, the content of alkylbenzene, ie, Kwai alkyl benzene ~ tridecyl benzene content is 85%, which indicates that some products can be fractionated from heavy alkylbenzene. From the whole analysis results, the measurement range of mass spectrometry has the advantages of high accuracy, strong feasibility and good repeatability. The obtained analytical data has a guiding role for the development and utilization of heavy alkylbenzenes. At the same time, mass spectrometry overcomes the limitation of column temperature in GC, which is unique in the analysis of heavy mixtures.