Evonik Degussa Gmbh

Evonik Operations Gmbh

Thyssenkrupp Uhde Gmbh

Florian Lode

Michael Benje

Marc Brendel

Hubertus Eickhoff

Manfred Bärz

Eduardo Arevalo

Claudia Wallert

Eduardo Federico Arévalo Saade

Brennan Chappell

The invention is directed to a process for concentrating aqueous hydrogen peroxide solution to give at least two hydrogen peroxide streams of different concentration in an apparatus which includes a preevaporator (), a distillation column () and a vapour compressor (). The aqueous hydrogen peroxide solution to be concentrated () is continuously fed into the preevaporator; vapour () produced by evaporation in the preevaporator is fed to the distillation column; bottom product () obtained in the preevaporator is withdrawn as a first concentrated hydrogen peroxide stream (); vapour () produced in the distillation column is withdrawn from the distillation column at the top of the column, compressed by the vapour compressor and used for heating the preevaporator; and the bottom product () obtained in the distillation column is withdrawn as a second concentrated hydrogen peroxide stream (); Concentrated hydrogen peroxide solutions having differing concentrations in the range from 50 to 70% by weight of hydrogen peroxide can be produced at the same time in a freely selectable ratio by feeding part of the bottom product obtained in the preevaporator in liquid form to the distillation column.

Method for concentrating an aqueous hydrogen peroxide solution

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Schöneck, Germany

Florian Lode