石油炼制与化工

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氧化氮化学电离质谱法测定减压馏分油中链烷烃

张正红 田松柏 刘泽龙   

  1. 嘉兴职业技术学院 石油化工科学研究院 石油化工科学研究院
  • 收稿日期:2008-12-12 修回日期:1900-01-01 出版日期:2009-06-12 发布日期:2009-06-12
  • 通讯作者: 张正红

DETERMINATION OF PARAFFINS IN VACUUM GAS OIL WITH NITRIC OXIDE CHEMICAL IONIZATION MASS SPECTROMETRY

TIAN Songbai Ze-Long LIU   

  • Received:2008-12-12 Revised:1900-01-01 Online:2009-06-12 Published:2009-06-12

摘要: 用5%NO/95%N2的混合气体作为反应气,用氧化氮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及正构烷烃与异构烷烃的分布。探讨了影响分子离子峰强度的各种因素,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,准确得到相对分子质量信息,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和异构烷烃的定量结果。

关键词: 氧化氮, 化学电离, 分子离子, 碳数分布

Abstract: The distribution of carbon number and content of paraffins in Daqing VGO was determined with nitric oxide chemical ionization mass spectrometry using a mixture gas of 5%NO and 95%N2 as reagent gas. Some factors affecting the molecular ion abundance were discussed and optimum test conditions were obtained. Qualitative analysis of paraffins could be carried out without adding standard compounds. Quantification of normal paraffins and iso-paraffins was obtained by combining total ion chromatogram and extract ion chromatogram.

Key words: Nitric Oxide, Chemical Ionization, Molecular Ion, Carbon Distribution