Method for concentrating an aqueous hydrogen peroxide solution

US9206047B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Hubertus Eickhoff · Alzenau, DE
• Florian Lode · Blankenloch, DE
• Eduardo Arevalo · Könnern, DE
• Marc Brendel · Bruchköbel, DE
• Claudia Wallert · Haltern, DE

Key dates

• Filing date: Jul 29, 2011
• Grant date: Dec 8, 2015
• Expiry date: Jan 3, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/19
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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 (1), a distillation column (2) and a vapour compressor (3). The aqueous hydrogen peroxide solution to be concentrated (4) is continuously fed into the preevaporator; vapour (5) produced by evaporation in the preevaporator is fed to the distillation column; bottom product (6) obtained in the preevaporator is withdrawn as a first concentrated hydrogen peroxide stream (7); vapour (8) produced in the distillation column is withdrawn from the distillation column at the top of the column, compressed by the vapour compressor and used for heating the preevaporator; and the bottom product (9) obtained in the distillation column is withdrawn as a second concentrated hydrogen peroxide stream (10); Concentrated hydrogen peroxide solutions having differing concentrations in the range from 50 to 70% by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 distill…