Basf Aktiengesellschaft

Basf Se Corporation

Ronald Schäfer

Stefan Bitterlich

Armin Diefenbacher

Hartwig Voβ

Ingolf Voigt

Gunter Schuch

Hannes Richter

Manfred Noack

Jürgen Caro

A method for producing membranes which contain at least one solid layer on one side of a porous substrate by treating the side of the support, which is to be coated, with a synthetic solution that forms the solid layer. The inventive method is characterized in that the space located behind the side of the porous support, which is not to be coated, is filled with an inert fluid during the production of the solid layer on the porous support, 'behind' being from the perspective of the support. The pressure and/or the temperature of the fluid is/are selected such that the synthetic solution is essentially prevented from entering in contact with the side of the porous support, which is not to be coated.

Membrane production method

Composite membranes comprising at least one porous substrate layer and at least one microporous separation layer, comprising at least one zeolite of the MFI type, are described, the separation layer being produced by a hydrothermal synthesis in which the molar ratio of silicon to aluminum is greater than 120 and the separation layer contains less than 10% by weight of aluminum in elemental or chemically bound form in a zone of at least 100 nm adjacent to the separation layer.

Composite membrane

Growing community of inventors

Aalen, Germany

Ronald Schäfer