Abstract 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 3wt % 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 μm from 1.5 μm 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 m3(STP)/m2.bar.hr and selectivity (CO2/CH4) of 41.The permeance decreased approximately 1.8 folds for PVAm/1CNC membrane with the increase in pressure from 5 to 15 bar. However, selectivity dropped from 41 to 39 for formulated membranes.

中文翻译：

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新型纤维素纳米晶体和聚乙烯胺纳米复合膜的沼气升级

摘要 合成了一种新型的结晶纳米纤维素 (CNC) 和聚乙烯胺 (PVAm) 基纳米复合膜，并评估了沼气升级的效果。使用浸涂法将不同浓度的 CNC 掺入商业聚砜 (PSf) 片材上的 3wt% PVAm 溶液中。研究进料压力（5、10 和 15 巴）对 CO2/CH4 分离的影响。CNC的加入增加了膜的结晶度。随着 CNC 浓度的增加，选择性层的厚度从 1.5 μm 增加到 2.16 μm。然而，当 CNC 浓度为 1.5 wt.% 时，溶胀度从 75.88% 降低到 68.93。最好的结果是 PVAm 膜与 1 wt。% CNC 浓度，即 CO2 渗透率为 0.0216 m3(STP)/m2.bar.hr，选择性 (CO2/CH4) 为 41。渗透率下降约 1。PVAm/1CNC 膜的 8 倍，压力从 5 巴增加到 15 巴。然而，配制膜的选择性从 41 下降到 39。