Recovery of ionic liquids from methanol by pervaporation with polydimethylsiloxane membrane

  • Zhe Yang
  • Shurong Gao
  • Zhongqi Cao
  • Xiaochun Chen
  • Guangren YuEmail author
Original Paper


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.


Recovery Ionic liquid Methanol Pervaporation PDMS 



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

Supplementary material

11696_2019_971_MOESM1_ESM.docx (20 kb)
Supplementary material 1 (DOCX 20 kb)


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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  • Zhe Yang
    • 1
    • 2
  • Shurong Gao
    • 1
    • 3
  • Zhongqi Cao
    • 1
  • Xiaochun Chen
    • 1
  • Guangren Yu
    • 1
    Email author
  1. 1.Beijing Key Laboratory of Membrane Science and Technology and College of Chemical EngineeringBeijing University of Chemical TechnologyBeijingChina
  2. 2.College of Chemical EngineeringHebei Normal University of Science & TechnologyQinhuangdaoChina
  3. 3.Research Center of Engineering ThermophysicsNorth China Electric Power UniversityBeijingChina

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