Evonik Degussa Gmbh

Evonik Operations Gmbh

Michael Eicker

Martin Koerfer

Martin Körfer

Chiu Kee Cheung

Thorsten Merker

Rainer Malzkorn

Bruno Krudewig

Haohao Zhu

Catrin Dorothee Becker

Marko Bussmann

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 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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Bergisch Gladbach, Germany

Michael Eicker