The United States of America As Represented by the Administrator of the U.S. Environmental Protection Agency

U.S. Environmental Protection Agency

Consiglio Nazionale Delle Ricerche

Università Della Calabria

Hochschule Karlsruhe Technik Und Wirtschaft

Alberto Figoli

Subhas K Sikdar

Enrico Drioli

John O Burckle

Binay K Dutta

Bartolo Gabriele

Shamim Ahmed Deowan

Jan Hoinkis

Giorgio De Luca

Hydrophobic, asymmetric membranes are formed integrally from elastomeric polymers. The membranes have a dense, discriminating layer and a thick, porous support layer and require no other support. The membranes of the invention provide an economic advantage over prior art composite membranes used for separating target organics from a mixture. Using the methods of the invention it is possible to separate two or more organic components wherein discrimination is made on the basis of molecular size.

Method for fabrication of elastomeric asymmetric membranes from hydrophobic polymers

Using the methods of the invention, an elastomeric polymer is dissolved in a suitable solvent, cast in one of the membrane casting techniques using a phase inversion technique, and immersed in a coagulation bath comprised of suitable solvent/non-solvent pairs (e.g., THF/water and ethanol). Asymmetric membranes having a dense discriminating layer and a thicker porous support layer suitable for application in pervaporation processes were obtained in a single step. An increase of the polymer concentration in the casting solution gives a more dense layer. When cast as formed using the methods of the invention, the membrane obtained is an integrally skinned membrane comprising a thin, dense separation layer over a porous support layer (asymmetric membrane) formed in a single casting operation. The resulting membrane is homogenous with respect to chemical composition.

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Lappano, Italy

Alberto Figoli