Cellulose-Based Composite Gas Separation Membranes

Abstract

A "green" method to synthesize new composite membranes from a cellulose solution in phosphoric acid on various ultrafiltration substrates is proposed. The method can be used in industry; it differs from the conventional viscose method for producing cellophane and other known methods for synthesizing cellulose-based gas separation membranes by the absence of gaseous emissions and wastewater. The structure of the synthesized samples is studied by electron microscopy, X-ray diffraction, and thermal analysis (DSC). Analysis of the mechanical properties of the samples shows that the new membranes have better mechanical characteristics than those of homogeneous pure cellulose films synthesized in this study and commercial cellophane films. The gas transport properties of new membranes with respect to O 2 , N 2 , CO 2 , CH 4 , and He are studied. It is found that the proposed membrane synthesis method provides the formation of uniform dense gas separation layers of cellulose; the membranes show a three orders of magnitude higher gas permeability than that of cellophane films. It is shown that the highest ideal selectivity is exhibited by membranes with a gas separation layer of cellulose on viscose fabric substrates.

Pervaporation Polyvinyl Alcohol Membranes Modified with Zr-Based Metal Organic Frameworks for Isopropanol Dehydration

“…Membrane technologies for filtering [ 1 , 2 , 3 , 4 ] and separation [ 5 , 6 , 7 , 8 , 9 ] of various solvents, gas separation [ 10 , 11 , 12 ], sorption [ 13 ], etc. are becoming more and more widespread in research and technology.…”

Features of Thermomechanical Stability of Anionic–Cation Exchange Matrix “Polikon AC” on Viscose Non-Woven Materials

“…The best nanofiltration characteristics were demonstrated by a cellulose membrane obtained by precipitation in an aqueous solution (30%) of acetic acid: PDMF = 0.67 kg/m 2 h atm. Syrtsova et al proposed a “green” method for obtaining new composite membranes from a cellulose solution in phosphoric acid on various ultrafiltration substrates [ 17 ]. In terms of “green” chemistry, cellulose is the most promising polymer because it has a constantly renewable plant raw material base and biodegrades under natural conditions.…”