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Preparation of Asymmetric PES Hollow Fiber Gas Separation Membranes and Their $CO_2/CH_4$ Separation Properties  

Park, Sung-Ryul (Environment and Resources Research Center, Korea Research Institute of Chemical Technology)
Ahn, Hyo-Seong (Environment and Resources Research Center, Korea Research Institute of Chemical Technology)
Kim, Jeong-Hoon (Environment and Resources Research Center, Korea Research Institute of Chemical Technology)
Publication Information
Membrane Journal / v.21, no.4, 2011 , pp. 367-376 More about this Journal
Abstract
Huge amount of $CH_4$ mixtures has been emitted from landfills and organic wastes via anaerobic digestion. The recovery of high purity $CH_4$ from these gases has two merits: reduction of green house gases and production of renewable fuels. Membrane technology based on polymeric materials can be used in this application. In this study, asymmetric gas separation hollow fiber membranes were fabricated to develop the membrane-based bio-gas purification process. Polyethersulfone (PES) was chosen as a polymer materials because of high $CO_2$ permeability of 3.4 barrer and $CO_2/CH_4$ selectivity of 50[1]. Acetone was used as a non-solvent additive because of its unique swelling power for PES and highly volatile character. The prepared PES hollow fiber showed excellent separation properties: 36 GPU of $CO_2$ permeance and 46 of $CO_2/CH_4$ selectivity at optimized preparation conditions: 9wt% acetone content, 10cm air-gap and 4wt% PDMS coating processes. With the PES hollow fiber membranes developed, mixed $CO_2/CH_4$ test was done by changing various operating conditions such as pressures and feed compositions to meet the highest recovery of CH4 with 95% purity. High $CH_4$ recovery of 58 wt% was observed at 10 atm feed pressure for the 50 vol% of $CO_2$ in $CO_2/CH_4$ mixture.
Keywords
polyethersulfone; $CO_2$; $CH_4$; membrane; bio gas;
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