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Membrane Gas Separation and Pervaporation: Solution-Diffusion Physics, Robeson Upper Bounds, Hollow-Fiber Modules, CO2 Removal, and Nitrogen Generation
Two hundred and forty kilometres offshore Brazil on a floating production vessel, a high-pressure hollow-fibre membrane skid stripping forty percent carbon dioxide out of associated pre-salt gas has started dumping valuable methane into the permeate reinjection stream—right after the inlet superheater tripped for twenty minutes. Noticeably higher permeate flow and collapsing selectivity point to one of the classic pathologies of glassy polymer membranes: CO2-induced plasticisation and heavy-hydrocarbon condensation. To understand why, we build membrane gas separation and pervaporation from…
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