高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 54.

• Analytical Sciences • 上一篇    下一篇

Crystal Forming Competition Between Some Pyridinium Trifluoroacetic Acetates

JIN Zhi-Min1, PAN Yuan-Jiang2, YUE Lin-Hai2   

  1. 1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014;
    2. Department of Chemistry, Zhejiang University, Hangzhou 310027
  • 出版日期:2000-12-31 发布日期:2000-12-31

Crystal Forming Competition Between Some Pyridinium Trifluoroacetic Acetates

JIN Zhi-Min1, PAN Yuan-Jiang2, YUE Lin-Hai2   

  1. 1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014;
    2. Department of Chemistry, Zhejiang University, Hangzhou 310027
  • Online:2000-12-31 Published:2000-12-31

PDF (PC)

摘要：

It is difficult to separate 4-methylpyridine (4-MP), 3-methylpyridine (3-MP) and 2,6-dimethylpyridine (DMP) which exist concurrently in tar oil distillation, because of their similar boiling points (4-MP, 145℃; 3-MP, 144℃;DMP, 144℃). Efforts have been made to separate 3-MP from the mixture of 4-MP and 3-MP by forming inclusion complex of 3-MP with hexadiyn, and with benzopinacol[1]. And, trifluoroacetic acid (TFA) has been used to separate 4-MP from the mixture of methylpyridines by reactive distillation[2]. Recently, TFA is used to separate 4-MP from the mixture by preferential co-crystallization. It is reported hereafter the crystal formation competition between some pyridinium trifluoroacetic acetates.

Abstract:

It is difficult to separate 4-methylpyridine (4-MP), 3-methylpyridine (3-MP) and 2,6-dimethylpyridine (DMP) which exist concurrently in tar oil distillation, because of their similar boiling points (4-MP, 145℃; 3-MP, 144℃;DMP, 144℃). Efforts have been made to separate 3-MP from the mixture of 4-MP and 3-MP by forming inclusion complex of 3-MP with hexadiyn, and with benzopinacol[1]. And, trifluoroacetic acid (TFA) has been used to separate 4-MP from the mixture of methylpyridines by reactive distillation[2]. Recently, TFA is used to separate 4-MP from the mixture by preferential co-crystallization. It is reported hereafter the crystal formation competition between some pyridinium trifluoroacetic acetates.

TrendMD: