Process for the preparation of an ultrapure solution of hydrogen peroxide by ion exchange with recycling

US6187189A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Henry Ledon · Versailles, FR
• Christine Devos · Versailles, FR
• Didier Demay · Le Puy-en-Velay, FR

Key dates

• Filing date: Mar 25, 1999
• Grant date: Feb 13, 2001
• Expiry date: Mar 25, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B15/0135
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Provided is a process for the preparation of an ultrapure hydrogen peroxide solution. The process comprises at least one sequence which includes passing a solution to be purified successively through at least one bed of anion-exchange adsorbents (AEA) and at least one bed of cation-exchange adsorbents (CEA). A non-zero proportion of the solution exiting from one of the beds is recycled to a point upstream of the one bed or upstream of a preceding bed or upstream of the first bed of the first of the at least one sequence. Also provided is a plant for the implementation of the inventive process.