L'air Liquide,societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude

Lurgi Gmbh

Lummus Technology Inc.

Air Liquide Global E&c Solutions Germany Gmbh

Markus Kreich

Frank Castillo-Welter

Thomas Gutermuth

Klaus Kirsten

Christoph Steden

Dominic Walter

Jochen Bauer

Rudolf Zeyen

This invention relates to a process for the purification of acrylic acid from a mixture containing acrylic acid and acetic acid, comprising the following steps: extraction of the mixture containing acrylic acid and acetic acid with an extractant stream, whereby a raffinate stream and an extract stream are obtained, distillation of the extract stream, whereby an acrylic acid stream and a return stream are obtained, wherein the return stream contains acetic acid and is recirculated into the extraction. Furthermore, the invention may include a plant for carrying out this process.

Process and plant for the purification of acrylic acid

A distillation column with external circulation evaporator and a sedimentation zone in the bottom of the column, from which the evaporator circulation is fed, and use of the distillation column for the distillation of acrylic acid.

Distillation column and method for distilling acrylic acid

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Otzberg, Germany

Markus Kreich