Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO2 Separation from CH4 and N2

Abstract

CO2 separation was found to be facilitated by transport membranes based on novel chitosan (CS)–poly(styrene) (PS) and chitosan (CS)–poly(acrylonitrile) (PAN) copolymer matrices doped with methylimidazolium based ionic liquids: [bmim][BF4], [bmim][PF6], and [bmim][Tf2N] (IL). CS plays the role of biodegradable film former and selectivity promoter. Copolymers were prepared implementing the latest achievements in radical copolymerization with chosen monomers, which enabled the achievement of outstanding mechanical strength values for the CS-based membranes (75–104 MPa for CS-PAN and 69–75 MPa for CS-PS). Ionic liquid (IL) doping affected the surface and mechanical properties of the membranes as well as the gas separation properties. The highest CO2 permeability 400 Barrers belongs to CS-b-PS/[bmim][BF4]. The highest selectivity α (CO2/N2) = 15.5 was achieved for CS-b-PAN/[bmim][BF4]. The operational temperature of the membranes is under 220 °C.

A Bibliometric Analysis of Research on Supported Ionic Liquid Membranes during the 1995–2015 Period: Study of the Main Applications and Trending Topics

“…For instance, on the one hand, the characterization of SILMs by very different techniques remains as a very hot topic, since these techniques can provide information for a better understanding of the mechanisms involved in the selective transport of SILMs. This is basic to optimize their applicability and implementation in real-scale industrial processes [ 52 , 53 , 54 , 55 ]. On the other hand, the analysis of the stability of the SILMs has been object of intensive research efforts, since the underlying liquid phase loss mechanism of SILMs must be taken into consideration in order to minimize it and extend the effective lifetime of SILMs [ 56 , 57 , 58 , 59 , 60 ].…”

Effects of ZnO Nanoparticle on the Gas Separation Performance of Polyurethane Mixed Matrix Membrane

“…Mixed matrix membranes (MMMs) are polymeric membranes filled with (nano)particles uniformly distributed in the polymer matrix to increase the membrane performance. The possibility of using organic or inorganic composite materials has been examined by researchers to improve the properties of the MMMs [ 12 , 13 , 14 , 15 ].…”

Effect of Moisture Presence on Gas Permeability through Gas Separation Membranes Based on Poly(Vinyltrimethylsilane) and Quaternized Chitosan

“…To obtain quaternized derivatives, we used chitosan (CTZ) (Bioprogress, Russia) prepared from chitin with a molecular weight of 8.7 × 10 4 -2.5 × 10 5 and a deacetylation degree of 80% without additional purification and potato starch (Verkhovicheskii Krakhmalnii Zavod, Russia) [22,25,26] with a molecular weight of 1.5 × 10 5 . Exhaustive alkylation (quaternization) of chitosan was carried out in aqueous solutions of CH 3 COOH (NaOH) containing glycidyltrimethylam-monium chloride (GTMAC) in an inert atmosphere at 85°C for 8 hours.…”

“…However, in the case of active transfer, for example, for perfluorinated polymer membranes [20] or for membranes based on ionic liquids [21], the permeability of active penetrants, such as ammonia and carbon dioxide, increased due to the action of the facilitated transfer mechanism, namely, facilitated diffusion [22].…”