Abstract
The theoretical approach to describing the experimental data on the sorption and diffusion of gaseous mixtures in polymers under high pressures has been developed on the basis of the concepts of dilute solution thermodynamics. Relationships have been found for the concentrations of the gas mixture components in the polymer matrix and their partial pressures. The relations derived for the flow of the gaseous mixture components in the polymer make due allowance for their interaction. The interaction of the mixture components is manifested as a relationship between the flow of one component and the concentration gradient of the other. Expressions are found for the partial permeability coefficients of the gaseous mixture on permeation through the polymer membranes. The expressions obtained are used to interpret the experimental data on the separation of binary mixtures on polyvinyltrimethylsilane membranes.
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