Selectivity and characteristics of direct contact membrane distillation type experiment. I. Permeability and selectivity through dried hydrophobic fine porous membranes

Permeability and selectivity through fine porous membranes of hydrophobic polymers and direct contact membrane distillation (DCMD) type separation with such membranes have been studied. The permeability of an organic solute in dilute aqueous solution through the dried hollow fiber membranes depends on the partial vapor pressure of the solute. The selectivity for alcohol observed in a pervaporation type experiment depends on the ratio of the mean pore radius of the membrane to the radius of the alcohol molecule. The fluxes of ethanol and water in DCMD type separation are directly proportional to the partial vapor pressure differences, and the selectivity for ethanol varies with the properties of the polymers and the membranes. Polarization of temperature and concentration and heat transport characteristics are also studied.

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