Evonik Operations Gmbh

Evonik Rohm Gmbh

Dirk Bröll

Steffen Krill

Hermann Siegert

Benedikt Laux

Volker Schleep

Christian Maul

Horst Hiltner

Patrick Peter

Thorsten Noll

Claus Zimmer

Thomas Krauss

The invention relates to a process for distillative removal of a unsaturated carboxylic anhydride of the general formula (I) R—C(O)—O—C—(O)—R in which R is an unsaturated organic radical having 2 to 12 carbon atoms, wherein said unsaturated carboxylic anhydride is discharged in gaseous form from a sidestream take-off and is condensed in an atomized liquid circulating stream of said unsaturated carboxylic anhydride.

Process for distillative purification of unsaturated carboxylic anhydrides

A process for continuous dissolution of a solid in a reaction medium includes: (a) providing a liquid by withdrawal of a portion of the reaction medium from a first reaction vessel; (b) contacting the liquid provided in (a) with the solid in a second reaction vessel to form a solution of the solid; and (c) recycling the solution formed in step b) into the first reaction vessel. The solid in the second reaction vessel is present in the form of a fixed bed which is traversed by the liquid.

Process for continuous dissolution of a solid in a reaction medium

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Langen, Germany

Dirk Bröll