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Density estimated physicochemical properties of alanine-based ionic liquid [C7mim][Ala] and its application in selective transesterification of soybean oil

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Abstract

Amino acid ionic liquid (AAIL) based on alanine, 1-n-heptyl-3-methylimidazolium alanine ([C7mim][Ala]), has been prepared and characterized. Since the IL can form strong hydrogen bonds with water, trace amount of water is a problematic impurity in the IL. Using the standard addition method (SAM), the densities were measured in the temperature range from 293.15 to 343.15±0.05 K. On the basis of the experimental data of density, the surface tension γ, molar volume, and the molecular volume V m, molar enthalpy of vaporization Δ1 g H m 0, and the thermal expansion coefficients α, for [C7mim][Ala] were estimated using semi-empirical methods. Also the interstice model has been verified with good accordance. Then the [C7mim][Ala] was taken as catalyst in the transesterification reaction with fatty acid, where soybean oil was used as raw material and methanol as reactant. The amount of catalyst, alcohol consumption, reaction time, temperature and other factors of the reaction were investigated. Using GC determination, the conversions were calculated by the internal standard method. The main ingredients of the products were identified by GC-MS as palm methyl ester and linoleic acid methyl ester only, which showed high selectivity in palmitic acid and linoleic acid.

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Authors and Affiliations

  1. China Ionic Liquid Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    DaWei Fang, Meng Li, RiLe Ge & YanAn Gao

  2. Institute of Rare and Scattered Elements Chemistry, Liaoning University, Shenyang, 110036, China

    DaWei Fang, ShuLiang Zang & JiaZhen Yang

  3. School of Chemistry and Materials Science, Liaoning Shihua University, Fushun, 113001, China

    Meng Li & ShuLiang Zang

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  1. DaWei Fang
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  2. Meng Li
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  3. RiLe Ge
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Correspondence to YanAn Gao.

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Fang, D., Li, M., Ge, R. et al. Density estimated physicochemical properties of alanine-based ionic liquid [C7mim][Ala] and its application in selective transesterification of soybean oil. Sci. China Chem. 55, 1677–1682 (2012). https://doi.org/10.1007/s11426-012-4646-2

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  • DOI: https://doi.org/10.1007/s11426-012-4646-2

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