离子液体-分子溶剂复合萃取剂脱除水中酚类化合物

doi:10.11949/j.issn.0438-1157.20160149

化工学报 ›› 2016, Vol. 67 ›› Issue (7): 2851-2856.DOI: 10.11949/j.issn.0438-1157.20160149

离子液体-分子溶剂复合萃取剂脱除水中酚类化合物

郭少聪^1,2, 杨启炜^1,2, 邢华斌^1,2, 张治国^1,2, 鲍宗必^1,2, 任其龙^1,2

1. 浙江大学化学工程与生物工程学院, 浙江杭州 310027;
2. 生物质化工教育部重点实验室浙江大学, 浙江杭州 310027

收稿日期:2016-02-03 修回日期:2016-03-03 出版日期:2016-07-05 发布日期:2016-07-05
通讯作者: 杨启炜
基金资助:
浙江省自然科学基金项目（LY15B060003）;国家自然科学基金重点项目（21436010）。

Removal of phenols from aqueous solution by ionic liquid-molecular solvent composite extractant

GUO Shaocong^1,2, YANG Qiwei^1,2, XING Huabin^1,2, ZHANG Zhiguo^1,2, BAO Zongbi^1,2, REN Qilong^1,2

1. College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2016-02-03 Revised:2016-03-03 Online:2016-07-05 Published:2016-07-05
Supported by:
supported by the Natural Science Foundation of Zhejiang Province (LY15B060003) and the National Natural Science Foundation of China (21436010).

摘要/Abstract

摘要：

构建了疏水性离子液体-分子溶剂复合萃取剂，并研究了其对酚类化合物的萃取性能。结果表明，与纯离子液体萃取剂相比，三己基十四烷基溴化（[P₆₆₆₁₄]Br）-乙酸乙酯复合萃取剂在显著降低萃取剂黏度的同时，获得了较高的酚类溶质分配系数。当萃取剂中[P₆₆₆₁₄]Br摩尔分数为20%时，苯酚的分配系数为345，是纯乙酸乙酯为萃取剂时的5.3倍，是[omim]BF₄、[C₁₂mim]NTf₂等常规疏水离子液体的9~60倍；比纯[P₆₆₆₁₄]Br为萃取剂时的分配系数下降25.3%，黏度却比纯[P₆₆₆₁₄]Br降低99%以上。COSMO-RS研究表明[P₆₆₆₁₄]Br与苯酚之间较强的氢键作用是获得较高苯酚分配系数的关键因素。该复合萃取剂对间苯三酚、4-氯苯酚和2,5-二硝基苯酚等物质也有良好的萃取能力。上述结果为开发兼具良好热力学性能和动力学性能的脱酚萃取剂提供了新的思路。

关键词: 离子液体, 萃取, 氢键, 酚类, 水处理

Abstract:

Hydrophobic ionic liquid (IL)-molecular solvent composite extractant was developed for the removal of phenols from aqueous solution. The results showed that tetradecyltrihexylphosphonium bromide ([P₆₆₆₁₄]Br)-ethyl acetate mixtures could not only decrease the viscosity of extractant notably, but also have good affinity to phenols. The distribution coefficient of phenol in [P₆₆₆₁₄]Br-ethyl acetate-water biphasic system ([P₆₆₆₁₄]Br/ethyl acetate molar ratio 1:4) was 5.3 times higher than that using pure ethyl acetate as extractant, 9—60 times higher than those using several common hydrophobic ILs and only 25.3% smaller than that using pure [P₆₆₆₁₄]Br. The viscosity of 20% (mol) [P₆₆₆₁₄]Br mixture was only 1% of pure [P₆₆₆₁₄]Br. The solvation interactions calculated by COSMO-RS indicated that there were strong hydrogen-bonding interaction between the phenol and [P₆₆₆₁₄]Br, which drove phenol into the [P₆₆₆₁₄]Br-rich phase. This mixture also showed good extraction abilities for phloroglucinol, 4-chlorophenol and 2,5-dinitrophenol with distribution coefficients of 91, 490 and 1492, respectively. These results provided a new opportunity for designing phenol-removing solvent with both good thermodynamic and kinetic properties.

Key words: ionic liquids, extraction, hydrogen bonding, phenols, water treatment

中图分类号:

TP028.3⁺2

郭少聪, 杨启炜, 邢华斌, 张治国, 鲍宗必, 任其龙. 离子液体-分子溶剂复合萃取剂脱除水中酚类化合物[J]. 化工学报, 2016, 67(7): 2851-2856.

GUO Shaocong, YANG Qiwei, XING Huabin, ZHANG Zhiguo, BAO Zongbi, REN Qilong. Removal of phenols from aqueous solution by ionic liquid-molecular solvent composite extractant[J]. CIESC Journal, 2016, 67(7): 2851-2856.

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离子液体-分子溶剂复合萃取剂脱除水中酚类化合物

Removal of phenols from aqueous solution by ionic liquid-molecular solvent composite extractant

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