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Recovery of ionic liquids from methanol by pervaporation with polydimethylsiloxane membrane

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Abstract

Pervaporation (PV) is a new membrane technology for the separation of liquid mixtures and has many advantages, such as high efficiency, low energy consumption, simple process and convenient operation. In this work, we investigated the recovery (separation) of ionic liquids (ILs) from methanol by PV with polydimethylsiloxane (PDMS) membrane for the first time. PDMS membrane was prepared using polyvinylidene fluoride (PVDF) membrane with sponge-like holes as base membrane. Five ILs were synthesized, i.e., 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]), 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][DEP]), 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP], 1-butyl-3-methylimidazolium cholorate ([BMIM][Cl]), and 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]). The influences of temperature, IL concentration, and IL specifies were investigated. It is observed that ILs do not penetrate through PDMS membrane. The flux increases along with temperature while decreases along with IL concentration in feed. Also, the flux depends on ILs species, and decreases following the order [EMIM][BF4] > [BMIM][DBP] > [BMIM][Cl] > [EMIM][DEP] > [MMIM][DMP]. A stable flux of 1666–1746 g m−2 h−1 was observed in a continuous running of 100 h, showing that PDMS membrane has a good stability for recovery of ILs from methanol. This work shows the PV with PDMS membrane is a good new method for recovering ILs from organic solvents.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (21878010).

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Author notes

  1. Zhe Yang and Shurong Gao contributed equally to this work.

Authors and Affiliations

  1. Beijing Key Laboratory of Membrane Science and Technology and College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Zhe Yang, Shurong Gao, Zhongqi Cao, Xiaochun Chen & Guangren Yu

  2. College of Chemical Engineering, Hebei Normal University of Science & Technology, Qinhuangdao, 066004, Hebei, China

    Zhe Yang

  3. Research Center of Engineering Thermophysics, North China Electric Power University, Beijing, 102206, China

    Shurong Gao

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  1. Zhe Yang
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  2. Shurong Gao
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  3. Zhongqi Cao
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  4. Xiaochun Chen
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  5. Guangren Yu
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Correspondence to Guangren Yu.

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Yang, Z., Gao, S., Cao, Z. et al. Recovery of ionic liquids from methanol by pervaporation with polydimethylsiloxane membrane. Chem. Pap. 74, 1331–1337 (2020). https://doi.org/10.1007/s11696-019-00971-y

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