Separation of methyl linolenate and its analogues by functional mixture of imidazolium based ionic liquid-organic solvent-cuprous salt

doi:10.1016/j.cjche.2018.05.009

Abstract

Abstract: Methyl linolenate was separated from its analogues by a new extraction system constructed by solvent, imidazolium based ionic liquids and cuprous salt. Firstly, the effect of ionic liquid on the dissolution of CuCl in acetonitrile, N,N-dimethylformamide (DMF), methanol and water was evaluated by visual observation.[C₄Mim] [Cl] can improve the dissolution of CuCl in acetonitrile. Then, for the new system as acetonitrile-ILs-CuCl, extraction equilibrium, distribution ratio and selectivity of methyl linolenate and its analogues were determined by gas chromatography analysis and the mass balance. The extraction time, IL structures and CuCl concentrations were investigated. Distribution ratio decreased slightly, but selectivity increased significantly with the addition of CuCl,[C₄Mim] [Cl] or[C₄Vim] [NTF₂] into acetonitrile.[C₄Vim] [NTF₂] had higher selectivity than[C₄Mim] [Cl]. But the selectivity of the system combining CuCl with[C₄Vim] [NTF₂] was much lower than with[C₄Mim] [Cl]. For the CuCl-[C₄Mim] [Cl]-acetonitrile, the extraction efficiency was better than CuCl-acetonitrile, increasing Cu⁺ concentration effectively improved the separation selectivity when ratio of CuCl/[C₄Mim] [Cl] was less than 1. Compared with previous aqueous AgNO₃ extractions, the method of using CuCl is a much cheaper and practical way to enrich unsaturated fatty acid.

Key words: Methyl linolenate, Cuprous salt, Ionic liquid, Cosolvent, Extraction

摘要： Methyl linolenate was separated from its analogues by a new extraction system constructed by solvent, imidazolium based ionic liquids and cuprous salt. Firstly, the effect of ionic liquid on the dissolution of CuCl in acetonitrile, N,N-dimethylformamide (DMF), methanol and water was evaluated by visual observation.[C₄Mim] [Cl] can improve the dissolution of CuCl in acetonitrile. Then, for the new system as acetonitrile-ILs-CuCl, extraction equilibrium, distribution ratio and selectivity of methyl linolenate and its analogues were determined by gas chromatography analysis and the mass balance. The extraction time, IL structures and CuCl concentrations were investigated. Distribution ratio decreased slightly, but selectivity increased significantly with the addition of CuCl,[C₄Mim] [Cl] or[C₄Vim] [NTF₂] into acetonitrile.[C₄Vim] [NTF₂] had higher selectivity than[C₄Mim] [Cl]. But the selectivity of the system combining CuCl with[C₄Vim] [NTF₂] was much lower than with[C₄Mim] [Cl]. For the CuCl-[C₄Mim] [Cl]-acetonitrile, the extraction efficiency was better than CuCl-acetonitrile, increasing Cu⁺ concentration effectively improved the separation selectivity when ratio of CuCl/[C₄Mim] [Cl] was less than 1. Compared with previous aqueous AgNO₃ extractions, the method of using CuCl is a much cheaper and practical way to enrich unsaturated fatty acid.

关键词: Methyl linolenate, Cuprous salt, Ionic liquid, Cosolvent, Extraction

Xianghong Lu, Jiajian Zhu, Xing Qian, Jianbing Ji. Separation of methyl linolenate and its analogues by functional mixture of imidazolium based ionic liquid-organic solvent-cuprous salt[J]. Chinese Journal of Chemical Engineering, 2019, 27(4): 811-817.

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