Highlighting Thermodynamic Coupling Effects in Alcohol/Water Pervaporation across Polymeric Membranes.

ABSTRACT: The pervaporation of binary alcohol/water mixtures across polymeric membranes is modeled by combining the Maxwell-Stefan (M-S) diffusion formulation with the Flory-Huggins (F-H) description of sorption equilibrium. The combined M-S/F-H model shows that the flux of each penetrant species is coupled to the driving force of its partner penetrant. Two types of coupling contributions can be distinguished: (i) coupling arising out of correlated motions of penetrants in the polymer matrix and (ii) thermodynamic coupling. The focus of this article is on the contribution of thermodynamic coupling, which is quantified by the set of coefficients , where a i , the activity of species i, is dependent on the volume fractions ϕ i ,ϕ j , of both penetrants in the polymeric membrane. Detailed analyses of p

SUBMITTER: Krishna R 

PROVIDER: S-EPMC6751729 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature