Journal of the Japan Petroleum Institute
Online ISSN : 1349-273X
Print ISSN : 1346-8804
ISSN-L : 1346-8804
Review Paper
Development of Organosilica Membranes with Ionic Liquid-like Properties and Application to Organic Vapor Separation
Yuichiro HIROTA
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2020 Volume 63 Issue 5 Pages 248-257

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Abstract

This review discusses the permeation and separation characteristics, the microstructure and the permeation mechanisms of organosilica membranes with ionic liquid (IL)-like properties, prepared from silylated ILs. The permeation and separation characteristics for binary toluene/H2 mixture, methanol synthesis gas/vapor mixtures, binary toluene/CH4 mixture and binary methanol/CH4 mixture were studied. The membranes showed selective permeation of toluene and methanol against H2, CO2 and CH4 at temperatures over 100 °C. The permselectivities were strongly controlled by the affinity of the permeated molecules for the ILs. The results showed that silylated IL-derived organosilica membranes show potential for selective recovery of organic vapors from inorganic/organic gases. Attenuated total reflectance infrared spectroscopy, N2 adsorption, gas/vapor permeation tests and nanopermporometry were also performed to evaluate the microstructure and permeation mechanisms of the new concept of organosilica membranes. The membrane depended on two permeation pathways, “only the dense IL regions” and “organosilica network-derived micropores + dense IL regions.” Furthermore, the contributions of two permeation pathways to gas permeation were successfully evaluated based on the nanopermporometry characteristics.

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