4.7 Article

Biogas upgrading with novel cellulose nano-crystals and polyvinyl amine nanocomposite membranes

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POLYMER TESTING
卷 91, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106867

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Polyvinyl amine; Cellulose nano-crystals; Biogas upgrading; Nanocomposite membranes; Fixed site carrier membranes

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A novel crystalline nano cellulose (CNC) and polyvinyl amine (PVAm) based nanocomposite membranes were synthesized and evaluated for biogas upgrading. Different concentrations of CNC was incorporated in 3 wt % PVAm solution on commercial polysulfone (PSf) sheet using dip coating method. The effect of feed pressure (5, 10 and 15 bar) was investigated for the CO2/CH4 separation. The incorporation of CNC increased the crystallinity of membranes. The thickness of selective layer enhanced to 2.16 mu m from 1.5 mu m with increasing concentration of CNC. However, degree of swelling reduced from 75.88% to 68.93 with CNC concentration at 1.5 wt%. The best results were shown by PVAm membrane with 1 wt % CNC concentration i.e. CO2 permeance of 0.0216 m(3)(STP)/m(2).barshr and selectivity (CO2/CH4) of 41.The permeance decreased approximately 1.8 folds for PVAm/1 CNC membrane with the increase in pressure from 5 to 15 bar. However, selectivity dropped from 41 to 39 for formulated membranes.

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