Evonik Degussa Gmbh

Evonik Operations Gmbh

Martin Steffan

Harald Jakob

Christoph Weckbecker

Steffen Krill

Hans Joachim Hasselbach

Martin Koerfer

Philipp Roth

Martin Körfer

Martin Steurenthaler

Jignesh Gangadwala

Helmut Mueller

Manfred Bäuml

Helmut MÜLLER

The reaction tube for preparing hydrogen cyanide comprises a cylindrical tube composed of ceramic, a catalyst comprising platinum applied to the inner wall of the tube and also at least one insert composed of ceramic, having three or four fins pointing from the tube axis to the inner wall of the tube, which is inserted into the cylindrical tube, wherein the fins divide the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean gap between the ends of the fins and the inner wall of the tube is in the range of 0.1 to 3 mm. In the method for preparing hydrogen cyanide, ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms are reacted in the reaction tube at 1000 to 1400&#xb0; C.

Reaction tube and method for producing hydrogen cyanide

The present invention relates to a process for preparing acrolein from propylene by catalytic gas phase oxidation with molecular oxygen (for example air). The invention further relates to the use of particular propylene-containing starting materials, for example refinery grade propylene, for preparation of acrolein.

Method for producing acrolein

A reactive rectification column suitable for the production of 2-hydroxy-4-methylmercaptobutyric acid and/or methionine contains a weir having a height of 100 mm or more.

Method for the conversion of methylmercaptopropionaldehyde formed from crude acrolein and crude methyl mercaptan

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Singapore, Singapore

Martin Steffan