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

doi:10.1016/S1004-9541(14)60056-2

Abstract

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

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

HE Zhijian, WANG Xiaomin, YAO Tian, SONG Hang, YAO Shun. Determination and Correlation of Solubilities of Four Novel Benzothiazolium Ionic Liquids with PF₆- in Six Alcohols[J]. Chin.J.Chem.Eng., 2014, 22(4): 435-446.

何志坚, 王小敏, 姚田, 宋航, 姚舜. Determination and Correlation of Solubilities of Four Novel Benzothiazolium Ionic Liquids with PF₆- in Six Alcohols[J]. Chinese Journal of Chemical Engineering, 2014, 22(4): 435-446.

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

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

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