| 离子液体-分子溶剂复合萃取剂脱除水中酚类化合物 |
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| 引用本文： | 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. |
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| 作者姓名： | 郭少聪 杨启炜 邢华斌 张治国 鲍宗必 任其龙 |
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| 作者单位： | 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 |
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| 基金项目： | 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）。 |
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| 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。
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| 关 键 词： | 离子液体 萃取 氢键 酚类 水处理 |
| 收稿时间： | 2016-02-03 |
| 修稿时间： | 2016-03-03 |
Removal of phenols from aqueous solution by ionic liquid-molecular solvent composite extractant |
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| 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].Journal of Chemical Industry and Engineering(China),2016,67(7):2851-2856. |
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| Authors: | GUO Shaocong YANG Qiwei XING Huabin ZHANG Zhiguo BAO Zongbi REN Qilong |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | ionic liquids extraction hydrogen bonding phenols water treatment |
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