Basf Aktiengesellschaft

Basf Se Corporation

Gunter Schuch

Stefan Bitterlich

Armin Diefenbacher

Ingolf Voigt

Hannes Richter

Manfred Noack

Hartwig Voss

Hartwig Voβ

Paul Panitz

Jürgen Caro

Ronald Schäfer

Wolfgang Harder

Peter Zehner

Werner Bertleff

Otto-Alfred Grosskinsky

Guenter Herrmann

Heinrich Laib

Robert Maerkl

Hans J Wilfinger

Wilfried Seyfert

Armin Stoessel

Peter Paessler

Gebhard Kuehn

Heinrich Reitz

Arthur Brunner

Jurgen Hartig

Rudolf Sinnen

Juergen 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

A process for the production of a composite membrane, one or more microporous separation layers comprising a zeolite of the MFI type being produced by hydrothermal synthesis on a porous substrate, wherein one or more additives from the group consisting of linear (C-C)-alcohols, ammonia, primary, secondary and tertiary amines having in each case (C-C)-alkyl radicals, (C-C)-aminoalcohols and (C-C)-ketones are added to the synthesis solution for the hydrothermal synthesis.

Process for producing a composite membrane

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

Process for the work-up of naphtha, wherein

Method for processing naphtha

A process for the continuous preparation of alkyl pentenoates comprises the following steps:

Continuous preparation of alkyl pentenoates

Alkyl pentenoates are prepared by reacting butadiene with carbon monoxide and an alkanol in the presence of a cobalt carbonyl complex and a tertiary, aromatic heterocyclic nitrogen base at from 80.degree. to 160.degree. C. under from 100 to 1,000 bar in the presence of from 0.1 to 10% by volume of hydrogen, based on the amount of carbon monoxide used.

Preparation of alkyl pentenoates

Oxygen-containing compounds are prepared by oxidizing a hydrocarbon in the liquid phase with a gas containing molecular oxygen, at elevated temperatures and under superatmospheric pressure, by a continuous process in which the said gas is fed into the liquid reaction mixture, in a downward direction, at several points along the reaction zone via nozzle apertures, so that it emerges at each nozzle aperture with a velocity of from 0.01 to 1 m/sec in an amount of from 0.001 to 10 liters per second per nozzle aperture, and the said reaction mixture is brought into substantially uniform contact with the gas containing molecular oxygen, over the volume of the reaction zone.

Continuous preparation of oxygen-containing compounds

Growing community of inventors

Ludwigshafen, Germany

Gunter Schuch