Question: Nitrogen is to be removed from a gas mixture with methane by gas permeation (see Table 1.2) using a glassy polymer membrane that is selective

Nitrogen is to be removed from a gas mixture with methane by gas permeation (see Table 1.2) using a glassy polymer membrane that is selective for nitrogen. However, the desired degree of separation cannot be achieved in one stage. Draw sketches of two different two-stage membrane cascades that might be considered to perform the desiredseparation. Separation Operation Initial or Feed Phase Industrial Example Symbol Separating Agent Okmosis

Separation Operation Initial or Feed Phase Industrial Example Symbol Separating Agent Okmosis (1) Liquid Nonporous membrane Reverse osmosis" (2) Liquid Nonporous membrane with pressure gradient Desalinization of sea water (Vol. 24. pp. 349-153) Dialysis (3) Liquid Porous membrane with Recovery of caustic from hemicellulose pressute gradient (Vol. 7. p. 572) Microfiltration (4) Liquid Microporous membrane with pressure gradient Removal of bacteria from drinking water (Vol. 15. p. 115) Ultrafiltration (5) Microporous membrane with pressure gradient Liquid Separation of whey from cheese (Vol. 15. pp. 562-564) Pervaporation" (6) Liquid Nonporous membrane with pressure gradient Separation of azcotropie mixtures (Vol. 15, pp. 116-117) Gas permeation' (7) Vapor Nonporous membrane with pressure gradient Hydrogen enrichment (Vol. 20. pp. 709-710) Liquid membrane (8) W/L Vapor andior liquid Liquid membrane with pressure gradient Removal of hydrogen sulfide (Vol. 15, p. 119)

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