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›› 2007, Vol. 7 ›› Issue (6): 1094-1098.

• 反应与分离 • 上一篇    下一篇

Quality Control of 1-Alkyl-3-methylimidazolium Ionic Liquid Precursors with HPLC

张延强,张建敏,陈玉焕,张锁江   

  1. 中国科学院过程工程研究所
  • 出版日期:2007-12-20 发布日期:2007-12-20

Quality Control of 1-Alkyl-3-methylimidazolium Ionic Liquid Precursors with HPLC

ZHANG Yan-qiang,ZHANG Jian-min,CHEN Yu-huan,ZHANG Suo-jiang   

  1. Institute of Process Engineering, Chinese Academy of Sciences
  • Online:2007-12-20 Published:2007-12-20

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摘要： A high performance liquid chromatography (HPLC) method was proposed to monitor the synthesis and purification of the 1-alkyl-3-methylimidazolium ionic liquid precursors from alkylation of 1-methylimidazole with alkyl halides and determine the purity of final products. The results showed that separation of 1-methylimidazole from the precursors could be obtained under the HPLC performance conditions such as cation exchange column, acetonitrile/KH2PO4 aqueous solution and 209 nm wavelength. The content of unreacted 1-methylimidazole in the precursors could be easily calculated from their corresponding HPLC peak areas with the calibration curve of 1-methylimidazole. The retention times of the 1-alkyl-3-methylimidazolium ionic liquid precursors decreased with their increasing alkyls, and the ionic liquids with the same cation and different anions had almost the same retention times.

关键词: 1-methylimidazole, purity, ionic liquid, precursor, HPLC

Abstract: A high performance liquid chromatography (HPLC) method was proposed to monitor the synthesis and purification of the 1-alkyl-3-methylimidazolium ionic liquid precursors from alkylation of 1-methylimidazole with alkyl halides and determine the purity of final products. The results showed that separation of 1-methylimidazole from the precursors could be obtained under the HPLC performance conditions such as cation exchange column, acetonitrile/KH2PO4 aqueous solution and 209 nm wavelength. The content of unreacted 1-methylimidazole in the precursors could be easily calculated from their corresponding HPLC peak areas with the calibration curve of 1-methylimidazole. The retention times of the 1-alkyl-3-methylimidazolium ionic liquid precursors decreased with their increasing alkyls, and the ionic liquids with the same cation and different anions had almost the same retention times.

Key words: 1-methylimidazole, purity, ionic liquid, precursor, HPLC