Composite membrane contg. thermoplastic polymer - useful in pervaporation and gas separation processes

摘要

Composite membrane (I) consists of: (i) a membrane of a film forming thermoplastic polymer contg. a microporous, inorganic filler, in the filler has a specific surface area of 5-200 m2/g and is60-90 wt.% of the total wt. of the membrane; (ii) a permiselective elastomeric separation film applied to the membrane. (2) Prepn. of (I) comprises i) dispersing a filler with a specific surface area of 5-200 m2/g in 60-90 wt.% in a soln. of a film forming polymer contg. a homogeneous casting soln. with a viscosity of 500-15,000 cp; (ii) processing this soln. into a membrane in the form of a foil pipe, tube or a hollow fibre, and removing the solvent by evaporation or coagulation by orecipitation; (iii) applying to the membrane a permiselective elastomeric separation film in the form of a soln. of the elastomer followed by solvent removal by evaporation. USE - (I) is used in pervaporation and gas separation processes.