H2 purification with PVDF/GTA blended membranes

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In this study, poly(vinylidene fluoride) (PVDF) and Glycerol Triacetate (GTA) have been selected as the main blending materials in order to fabricate membranes with a high separation ability for CO2/H2. GTA as a plasticizer possesses very low vapor pressure and its ability to separate CO2 from H2 as a solvent is high (with CO2/H2 solubility selectivity of around 100). The permeation performance of the membranes was evaluated by constant volume method at 30°C and 4 bar. The results show that the permeation of CO2 and H2 increases when GTA mass content rises. With increment in the amount of GTA in membrane structure, as the membrane morphology become more amorphous, molecules of gases diffuse easier, thereby for all the tested gases permeability increases. For the case of CO2, this increment is relatively higher as GTA is highly CO2-selective, which is due to its high oxygenated structure with carbonyl functional groups that are quite well known for CO2 capture. Thereby, CO2/H2 selectivity rises as GTA content increases.

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Journal: TechConnect Briefs
Volume: 2, Materials for Energy, Efficiency and Sustainability: TechConnect Briefs 2015
Published: June 14, 2015
Pages: 187 - 190
Industry sector: Energy & Sustainability
Topics: Carbon Capture & Utilization
ISBN: 978-1-4987-4728-8