Evonik Degussa Gmbh

Claudia Wallert

Marc Brendel

Hubertus Eickhoff

Eduardo Arevalo

Florian Lode

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evaporation in the preevaporator is fed to the distillation column; bottom product () obtained in the preevaporator is withdrawn as a first concentrated hydrogen peroxide stream (); vapour () produced in the distillation column is withdrawn from the distillation column at the top of the column, compressed by the vapour compressor and used for heating the preevaporator; and the bottom product () obtained in the distillation column is withdrawn as a second concentrated hydrogen peroxide stream (); Concentrated hydrogen peroxide solutions having differing concentrations in the range from 50 to 70% by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.

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Haltern, Germany

Claudia Wallert