Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Thyssenkrupp Industrial Solutions Ag

Evonik Operations Gmbh

Krick Messtechnik & Partner Gmbh & Co. Kg

Robert Jahn

Thomas Haas

Matthias Pascaly

Guido Stochniol

Bernd Jaeger

Wolfgang Wöll

Marc Brendel

Manfred Bärz

Jürgen Schemel

Michael Dopfer

Herbert Krick

In a process for the epoxidation of an olefin by continuously reacting the olefin with hydrogen peroxide in a methanol solvent on a fixed bed epoxidation catalyst comprising a titanium zeolite, the hydrogen peroxide is used as an aqueous hydrogen peroxide solution made by an anthraquinone process, the aqueous hydrogen peroxide solution is mixed with methanol to give a feed mixture and this feed mixture is filtered before being contacted with the fixed bed epoxidation catalyst.

Process for the epoxidation of an olefin

In a process for the epoxidation of propene, comprising the steps: reacting propene with hydrogen peroxide in the presence of a titanium silicalite catalyst and a methanol solvent; separating non-reacted propene and propene oxide from the resulting reaction mixture to provide a solvent mixture comprising methanol and water in a combined amount of at least 90% by weight; and feeding this solvent mixture as a feed stream to a continuously operated methanol distillation column at a feed point in the middle section of said column to provide an overhead product comprising at least 90% by weight methanol and a bottoms product comprising at least 90% by weight water; the addition of a liquid defoamer, having a solubility in the feed stream of less than 10 mg/kg at 25&#xb0; C. and a surface tension at the liquid air interface of less than 22 mN/m at 20&#xb0; C., at or above the feed point in an amount exceeding the solubility of the liquid defoamer in the feed stream suppresses foam formation in the methanol distillation column.

Process for the epoxidation of propene

Hydrogen peroxide is produced by reacting hydrogen and oxygen in the presence of a noble metal catalyst in a liquid reaction medium, the reaction being performed in the presence of a sulfuric acid alkyl ester. In the presence of sulfuric acid alkyl esters the noble metal catalyst exhibits a high and lasting activity for the formation of hydrogen peroxide with an elevated selectivity of hydrogen peroxide formation relative to the hydrogen used. Solutions of hydrogen peroxide in methanol obtainable by the process are suitable for use for the epoxidation of olefins.

Process for the production of hydrogen peroxide

The invention is directed to the preparation of organic or aqueous-organic hydrogen peroxide solutions by direct synthesis from a non-explosive gaseous mixture containing hydrogen and oxygen. The process is carried out in the presence of a noble metal catalyst, using a reaction medium containing a halide and a strong acid. It can be performed in a stainless steel reactor without corrosion occurring to the reactor material if, during the reaction, the surface of the stainless steel is, at no place, in permanent contact with the gaseous mixture passing through the reactor.

Process for the direct synthesis of hydrogen peroxide

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Rodenbach, Germany

Robert Jahn