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Selective Separation of Methacrylic Acid and Acetic Acid from Aqueous Solution Using Carboxyl-Functionalized Ionic Liquids
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acssuschemeng.7b03516
Yinge Bai 1, 2 , Ruiyi Yan 1 , Wenhui Tu 1, 2 , Jianguo Qian 1, 2 , Hongshuai Gao 1 , Xiangping Zhang 1, 2 , Suojiang Zhang 1, 2
Affiliation  

Five kinds of carboxyl-functionalized quaternary ammonium ionic liquids (ILs), tricaprylmethylammonium succinate ([A336]Suc), tricaprylmethylammonium aspartate ([A336]Asp), tricaprylmethylammonium glutamate ([A336]Glu), tricaprylmethylammonium trifluoroacetate ([A336]TFA), and tricaprylmethylammonium phthalate ([A336]Pha), with strong hydrophobicity and hydrogen bond basicity were used to separate methacrylic acid (MAA) and acetic acid (HAc) from an aqueous solution. [A336]Suc shows better extraction performance than the other ILs because of the stronger hydrogen bonding basicity. Even though HAc shows the antagonistic effect on the extraction of MAA, the selectivity of MAA to HAc is achieved 54.70 for [A336]Suc at the optimized extraction conditions. The molecular mechanism of the extraction by IL is revealed by combining FT-IR and quantum chemical calculations. The results indicate that multiple hydrogen bonds are presented in the IL–acid complex which plays an important role in the acid extraction. Meanwhile, the computational studies demonstrate that the preferential extraction of MAA to HAc by [A336]Suc originated from the difference in the strength of the hydrogen bonding interaction between carboxylate group of ILs and acid.

中文翻译:

羧基官能化离子液体从水溶液中选择性分离甲基丙烯酸和乙酸

五种羧基官能化季铵离子液体(ILs),琥珀酸三辛基甲基铵([A336] Suc),天冬氨酸三辛基甲基铵([A336] Asp),谷氨酸三辛基甲基铵([A336] Glu),三辛基甲基甲铵(AA336)用具有强疏水性和氢键碱性的邻苯二甲酸三辛基甲基铵盐([A336] Pha)从水溶液中分离出甲基丙烯酸(MAA)和乙酸(HAc)。[A336] Suc显示出比其他IL更好的提取性能,因为它具有更强的氢键碱性。即使HAc对MAA的提取表现出拮抗作用,在最佳提取条件下,[A336] Suc的MAA对HAc的选择性仍达到54.70。结合红外光谱和量子化学计算揭示了白细胞介素提取的分子机理。结果表明,IL-酸络合物中存在多个氢键,在酸的提取中起着重要的作用。同时,计算研究表明,[A336] Suc优先提取MAA到HAc的原因是ILs的羧酸盐基团与酸之间的氢键相互作用强度不同。
更新日期:2017-11-16
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