Process for the preparation of an ultrapure solution of hydrogen peroxide by ion exchange with recycling
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsHenry Ledon, Christine Devos, Didier Demay
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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.
Claims5
A plant for preparation of an ultrapure hydrogen peroxide solution, comprising a source of a hydrogen peroxide solution to be purified, at least one bed of anion-exchange adsorbents and at least one bed of cation-exchange adsorbents, said beds being connected to allow at least one sequence which includes passing the hydrogen peroxide solution to be purified successively through at least one bed of anion-exchange adsorbents followed by at least one bed of cation-exchange adsorbents, and to allow a non-zero proportion of the solution exiting from said at least one sequence to be recycled to a point upstream of the first bed of said at least one sequence, said plant being connected to a point of use of the ultrapure hydrogen peroxide solution.
Dependencies are inferred from the claim text.