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用5%NO-95%N2的混合气体作为反应气,用化学电离质谱法分析得到了大庆减压馏分油中链烷烃的碳数分布和正构烷烃与异构烷烃的含量分布。试验探讨了影响分子离子强度的各种因素,选择了最佳的工作条件。在确定的工作条件下,不需加入标准化合物,即可对不同碳数的链烷烃进行定性分析,同时,结合总离子流色谱图,通过抽提离子的方法可以得到链烷烃中正构烷烃、异构烷烃的定量结果。
The gas mixture of 5% NO-95% N2 was used as reactant gas, and the carbon number distribution and the content distribution of n-paraffin and isoparaffin in Daqing vacuum distillate were analyzed by chemical ionization mass spectrometry. The experiment explored various factors affecting the ionic strength of the molecule and selected the best working conditions. Under definite operating conditions, the qualitative analysis of paraffins of different carbon numbers can be conducted without adding standard compounds. At the same time, n-alkanes in paraffins can be obtained by extracting ions by combining the total ion chromatogram, Quantitative results of paraffin.