Performance Analysis of Blended Membranes of Cellulose Acetate with Variable Degree of Acetylation for CO2/CH4 Separation

Abstract

The separation and capture of CO2 have become an urgent and important agenda because of the CO2-induced global warming and the requirement of industrial products. Membrane-based technologies have proven to be a promising alternative for CO2 separations. To make the gas-separation membrane process more competitive, productive membrane with high gas permeability and high selectivity is crucial. Herein, we developed new cellulose triacetate (CTA) and cellulose diacetate (CDA) blended membranes for CO2 separations. The CTA and CDA blends were chosen because they have similar chemical structures, good separation performance, and its economical and green nature. The best position in Robeson’s upper bound curve at 5 bar was obtained with the membrane containing 80 wt.% CTA and 20 wt.% CDA, which shows the CO2 permeability of 17.32 barrer and CO2/CH4 selectivity of 18.55. The membrane exhibits 98% enhancement in CO2/CH4 selectivity compared to neat membrane with only a slight reduction in CO2 permeability. The optimal membrane displays a plasticization pressure of 10.48 bar. The newly developed blended membranes show great potential for CO2 separations in the natural gas industry.

Preparation of Microfiltration Hollow Fiber Membranes from Cellulose Triacetate by Thermally Induced Phase Separation

“…Figure shows the cross sections near the outer surface (“1”, left column) and near the inner surface (“2”, right column). Overall, we saw no significant difference among the membranes A–F, all of which showed a completely porous interconnected structure with a pore size of ∼100 nm or larger rather than the spherical structure seen in many other studies. ,,,− ,− ,, From Figures and , the cloud point is higher than the crystallization temperature in all systems. Therefore, interconnected structures were formed here due to the liquid phase separation.…”

Recent developments in polysaccharide and lignin-based (nano)materials for CO2 capture

“…For CO 2 separations, Raza and colleagues produced novel blended membranes made of CTA and cellulose diacetate (CDA). 248 CTA and CDA blends were selected due to their similar chemical structures, strong separation performance, availability, and environmental friendliness. With a CO 2 permeability of 17.32 barrer and a CO 2 /CH 4 selectivity of 18.55, CTA : CDA (80 : 20) has moved higher in Robeson's upper bound curve.…”

A Review on the Modification of Cellulose and Its Applications

“…When it comes to cellulose aromatic esters, benzoyl chlorides with various p-substituted groups are commonly used to benzoylate the cellulose. In order to perform the reaction, a binary combination of 1-butylpyridinium chloride ([BPy][Cl]) and DMSO was used [ 74 ].…”