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This Article focuses on the optimization of the fabrication procedure and preparation conditions of a polyvinylamine/poly(vinyl alcohol) (PVAm/PVA) blend membrane with respect to its CO 2 /CH 4 separation performance at elevated pressures and the up-scaling of the PVAm/PVA blend flat sheet membrane for pilot scale tests. Experiments show that the optimized membrane preparation conditions for CO 2 /CH 4 separation are different from those for CO 2 /N 2 separation, especially when operating at elevated pressures, which is considered for applications such as biogas upgrading. The effects of membrane preparation conditions were investigated and membrane CO 2 /CH 4 separation performance was evaluated at elevated pressures (CO 2 partial pressure up to 5.6 bar). Up-scaled flat sheet membranes (300 × 300 mm) were prepared using a dip-coating procedure. The selection of the support substrate and aging of the membrane were also investigated. A CO 2 permeance of up to 0.58 m 3 / (m 2 h bar), and a CO 2 /CH 4 selectivity of up to 45 were documented at 2 bar with 10% CO 2 in feed gas. The membrane showed excellent stability over a 5-month test.
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Deng et al. (2015) studied this question.
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