Evonik Operations Gmbh

Evonik Degussa Gmbh

Thorsten Merker

Martin Koerfer

Judith Hierold

Christian Kaiser

Rainer Malzkorn

Michael Eicker

Harald Jakob

Hans Joachim Hasselbach

Stephan Rautenberg

Philipp Roth

Martin Körfer

Martin Steurenthaler

Chiu Kee Cheung

Daniel Fischer

Anja Nordschild

Daniel Sudhoff

Markus Held

Sascha Ceylan

Bruno Krudewig

Haohao Zhu

Catrin Dorothee Becker

Marko Bussmann

A process for the recovery of a light boiler and a heavy boiler from a vapor stream includes introducing a vapor stream comprising a light boiler and a heavy boiler into a column, withdrawing a vapor stream () enriched in the light boiler from the top of the column and a liquid stream () enriched in the heavy boiler from the bottom of the column. The stream () is split into a stream () and a stream (). The stream () is recycled into the column and is not cooled during the recycling. A stream (), enriched in a middle boiler, is withdrawn from the middle section of the column and is split into streams () and (). The stream () is cooled in a heat exchanger and the cooled stream is recycled into the column below the top of the column. The streams () and () are withdrawn.

Process for the recovery of a light boiler and a heavy boiler from a vapor stream

The present invention relates to a process for the purification of hydrogen cyanide, comprising the steps of a) splitting a liquid feed stream () comprising hydrogen cyanide into at least a first liquid stream () and a second liquid stream (), b) introducing the first liquid stream () into a distillation column () at a point between the top and the bottom of the distillation column, c) introducing the second liquid stream () into the distillation column () at the top of the distillation column, d) withdrawing an overhead vapor stream () enriched in hydrogen cyanide from the distillation column (), and e), withdrawing a bottom stream () depleted in hydrogen cyanide, wherein the temperature of the second liquid stream () in step c) is lower than the temperature of the first liquid stream () in step b).

Process for the purification of hydrogen cyanide

The present invention relates to a method for preparing 3-methylthiopropionaldehyde by reacting methyl mercaptan with acrolein, in which deviations in the stoichiometry of methyl mercaptan to acrolein in the reaction to give 3-methylthiopropionaldehyde are compensated for by supplying or by forming 1,3-bis(methylthio)-1-propanol, and also to the use of 1,3-bis(methylthio)-1-propanol as a storage form of methyl mercaptan and/or 3-methylthiopropionaldehyde.

Method for preparing 3-methylthiopropionaldehyde

The present invention relates to a method for preparing methionine or methionine salts. In particular, the invention describes the step of preparing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN) from 3-methylthiopropanal (MMP) and hydrogen cyanide (HCN) in the presence of ammonia by bringing a gaseous mixture comprising HCN and ammonia into contact with MMP.

Method for preparing methionine

The present invention relates to a process for purifying acrolein. The process includes the steps of a) splitting a liquid feed stream containing acrolein into at least a first liquid stream and a second liquid stream, b) introducing the first liquid stream with a temperature T1 into a distillation column at a point between the top and the bottom of the distillation column, c) introducing the second liquid stream with a temperature T2 into the distillation column at the top of the distillation column, d) withdrawing an overhead vapor stream enriched in acrolein from the distillation column, and e) withdrawing a bottom stream depleted in acrolein. The temperature T2 of the second liquid stream in step c) is lower than the temperature T1 of the first liquid stream in step b).

Process for the purification of acrolein

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Erftstadt, Germany

Thorsten Merker