Abstract
A selective mass transfer can be obtained applying a thermal gradient across some microporous membranes. The phenomenon, related to thermal diffusion of liquids and vapors in porous media, might contribute to solve some waste water problems and chemical separation and recovery, specifically when the additional costs for creating the temperature difference across the membrane are zero. A study has been carried out to identify the physical parameters which control this process. Experimental results will be discussed which describe the influence of polymeriv material properties, of the degree of porosity, of solution concentrations, of thermal gradients and absolute temperature on the separation factors and fluxes. A comparison of performances and operating costs between a membrane pressure driven process and a membrane thermal driven process is also presented for various operating conditions.
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