Akzo N.v.

Wolfgang Klein

Rudi Wollbeck

Klaus Schneider

Franz J Schmitz

A process for maintaining a charging medium in a microporous molded article for carrying out material transfer processes is described. A charging medium is supplied or presented to the molded article while the material transfer processes are being carried out. This supply takes place on a part of the surface of the molded article which does not participate in the material transfer process. The molded articles are preferably membranes. The process compensates for a loss of medium in the pores of the molded article without requiring the material transfer process to be interrupted. An apparatus suitable for carrying out the process is also described. The process may advantageously be used inter alia for controlled release or slow release processes and processes for facilitated or coupled transport of metal ions.

Process for maintaining a charge of a microporous molded article

A method for the bubble-free feed of gaseous reactants of a chemical and/or biological reaction into a liquid reaction medium, characterized by filling the pores of a porous polymer membrane with the reaction medium, providing one side of the porous polymer membrane with the gaseous reactants, and immersing the other side of the porous polymer membrane into the liquid reaction medium. The pressure of the gaseous reactants should lie below the bubble pressure determined for the reaction medium, but be at least so great that the liquid reaction medium does not pass through the porous polymer membrane to the gas side. Preferred parameters include relative pore volume between 50 and 90%; maximal pore diameter between 0.2 and 3 .mu.m; and disposing the porous polymer membrane in the form of a flat membrane, tube or hollow filaments.

Method for bubble-free gas feed

An arrangement for filtering a liquid and separating of gases from the liquid has a wettable gas-impermeable microporous filter layer and a liquid-repelling gas-permeable microporous ventilating element which is formed at least as a portion of a peripheral wall of a housing.

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Klingenberg, Germany

Wolfgang Klein