SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (4): 435-446.DOI: 10.1016/S1004-9541(14)60056-2

• 催化、动力学与反应工程 • 上一篇    下一篇

Determination and Correlation of Solubilities of Four Novel Benzothiazolium Ionic Liquids with PF6- in Six Alcohols

何志坚1,2, 王小敏2, 姚田2, 宋航2, 姚舜2   

  1. 1 School of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, China;
    2 School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • 收稿日期:2013-08-06 修回日期:2013-12-22 出版日期:2014-04-28 发布日期:2014-04-04
  • 通讯作者: YAO Shun
  • 基金资助:

    Supported by the National Natural Science Foundation of China (81102344), the Scientific Research Fund of Sichuan Province Education Department (12ZA080), Mianyang Normal University for Excellent Plan Fund (QD2012A06) and the Project of Mianyang Science and Technology Bureau (10Y003-8).

Determination and Correlation of Solubilities of Four Novel Benzothiazolium Ionic Liquids with PF6- in Six Alcohols

HE Zhijian1,2, WANG Xiaomin2, YAO Tian2, SONG Hang2, YAO Shun2   

  1. 1 School of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, China;
    2 School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2013-08-06 Revised:2013-12-22 Online:2014-04-28 Published:2014-04-04
  • Supported by:

    Supported by the National Natural Science Foundation of China (81102344), the Scientific Research Fund of Sichuan Province Education Department (12ZA080), Mianyang Normal University for Excellent Plan Fund (QD2012A06) and the Project of Mianyang Science and Technology Bureau (10Y003-8).

摘要: Four novel benzothiazolium ionic liquids with PF6-([C1Bth][PF6], [C4Bth][PF6], [C5Bth][PF6] and [C6Bth][PF6]) were synthesized, and the rang of their melting points were determined between 358.35 K-424.05 K. The relationship of their melting points and the length of the straight alkyl chain on cation reflected ‘S' type tendency. Then, the solubilities of the four ionic liquids in six lower alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-methyl-1-propanol) were measured in the temperature rang of 253.15-383.15 K at atmospheric pressure with static analytical method, respectively. It was found that [C6Bth][PF6] in all investigated ionic liquids had the largest solubility in six alcohols and the solubility of [C4Bth][PF6] in methanol was very sensitive for temperature in 313.15-333.15 K, which was so-called "temperature-sensitivity". This feature is of great significance to their application of catalyzing reaction or extraction process, and makes the recovery and reuse of ionic liquids (ILs) become easier. Moreover, the experimental solubility data were correlated with the modified Apelblat equation and λh equation, respectively. It was found that the result of correlation using two divided temperature ranges was better than that of using the whole temperature range.

关键词: ionic liquids, benzothiazolium, alkanol, solubility, temperature-sensitivity, correlation

Abstract: Four novel benzothiazolium ionic liquids with PF6-([C1Bth][PF6], [C4Bth][PF6], [C5Bth][PF6] and [C6Bth][PF6]) were synthesized, and the rang of their melting points were determined between 358.35 K-424.05 K. The relationship of their melting points and the length of the straight alkyl chain on cation reflected ‘S' type tendency. Then, the solubilities of the four ionic liquids in six lower alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-methyl-1-propanol) were measured in the temperature rang of 253.15-383.15 K at atmospheric pressure with static analytical method, respectively. It was found that [C6Bth][PF6] in all investigated ionic liquids had the largest solubility in six alcohols and the solubility of [C4Bth][PF6] in methanol was very sensitive for temperature in 313.15-333.15 K, which was so-called "temperature-sensitivity". This feature is of great significance to their application of catalyzing reaction or extraction process, and makes the recovery and reuse of ionic liquids (ILs) become easier. Moreover, the experimental solubility data were correlated with the modified Apelblat equation and λh equation, respectively. It was found that the result of correlation using two divided temperature ranges was better than that of using the whole temperature range.

Key words: ionic liquids, benzothiazolium, alkanol, solubility, temperature-sensitivity, correlation