Akzo N.v.

Franz J Schmitz

Karl Ostertag

Rudi Wollbeck

Werner Bandel

Hans Georg Tilgner

Hans G Breidohr

Wolfgang Klein

Friedrich Garske

Process for reducing alcohol in fermented beverages by means of dialysis

Fermented beverages of a reduced alcohol contents are made by causing the fermented beverage having a normal alcohol contents as produced in the fermentation to flow along one face of a dialysis membrane at a pressure differential below 5.0 bar while simultaneously a dialysate liquid which is substantially alcohol-free is passed along the other face of the dialysate membrane. An apparatus for carrying out the process comprises a housing in which two separate chambers are provided. Each chamber has separate inlet and outlet ducts. The inlet ducts are connected to separate feeding devices for liquids. Separate regulating devices are arranged for regulating the flow through each of said two chambers and means are provided for regulating the pressure differential between the two chambers.

Process and apparatus for reduction of alcohol by dialysis in fermented

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

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Erlenbach, Germany

Franz J Schmitz