Abstract
By allowing a hydrocarbon mixture to permeate through a thin film of a liquid with which it is essentially immiscible, separation of the constituents of this mixture may occur. The phenomenon has been observed with both unsupported and supported liquid films. This paper discusses liquid membrane permeation (LMP) through unsupported liquid films, especially those present when an emulsion of two liquids is dispersed in the form of relatively coarse drops in a third liquid into which permeation is allowed to occur from within the drops. The mechanism underlying the separation phenomenon, differential permeation rates, can be used to formulate an actual separation process. Rate equations can be derived which allow sizing of equipment and comparison of LMP with other separation techniques. Possible improvements involving preferential complexing agents in the membrane phase, as well as potential applications to oil refining and other chemical processes, are discussed.
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