It has been suggested that carbon dioxide can be recovered from flue as using a membrane process. The flue gas has composition: nitrogen 73.9 mol%, oxygen 3.1 mol%, carbon dioxide 7.7 mol%, water vapour 15.3 mol%. Using the data in Table 10.2, determine the best membrane material for this process. What are the advantages and disadvantages of the proposed membrane process?

Data from table 10.2

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Table 10.2 Membrane permeability coefficients (cm³ (STP).cm/cm².s.cmHg) × 10¹0 taken from Osada and Nakagawa (1992) Membrane Natural rubber Ethyl cellulose Polystyrene Polycarbonate Poly(dimethylsiloxane) Poly(ethylene phthalate) Poly(vinyl alcohol) Temperature (°C) 25 25 20 25 25 25 20 CO₂ 99.6 113 10 8 3240 0.15 0.0005 0₂ 17.7 15 2.01 1.4 605 0.03 0.00052 N₂ 6.12 3 0.32 0.3 300 0.006 0.00045