# US 4,393,038 A · Hydrogen peroxide production

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- Number: US 4,393,038 A
- Document ID: US4393038A
- Status: Granted
- Kind: A
- Application number: 06/312,060
- Filed: 1981-10-16
- Granted: 1983-07-12
- Earliest claimed: 1981-10-16
- Assignees: Atlantic Richfield Company
- Inventors: Hsiang-ning Sun; John J. Leonard; Harold Shalit
- Web page: https://patentgrep.com/patent/US4393038A

## CPC

- C01B 15/029: Preparation from hydrogen and oxygen
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

Hydrogen is diffused through a palladium-containing membrane into an aqueous solution containing ions of a stabilizing nature and containing dissolved oxygen to form hydrogen peroxide. Some water is formed as a by-product. The hydrogen peroxide may be identified and/or recovered from said aqueous solution in an identification zone.

## Claims

### Claim 1

A method of preparing aqueous solution of hydrogen peroxide which method consists of:
providing a slightly acidic aqueous solution containing ions tending to stabilize hydrogen peroxide and substantially free from ions catalyzing the decomposition of hydrogen peroxide;
dissolving oxygen in said aqueous solution; positioning a first surface of a predominantly palladium membrane metallic structure in contact with said aqueous solution containing dissolved oxygen;
controlling the pressure of a hydrogen stream so that hydrogen is supplied to the surface opposite said first surface of said metallic structure at a rate at least equal to the diffusion rate of hydrogen through said membrane;
controlling the temperature of said aqueous solution and said metallic structure to be within the range from 10.degree.-150.degree. C., whereby the hydrogen diffusing to said first surface surface of said membrane reacts with dissolved oxygen to form a reaction mixture consisting of hydrogen peroxide and water plus said aqueous solution;
directing a stream of said reaction mixture to a recovery zone appropriate for the recovery of the thus produced hydrogen peroxide.

### Claim 2 (depends on 1)

The method of claim 1 in which the surfaces of said metallic structure are a palladium silver alloy.

### Claim 3 (depends on 1)

The method of claim 1 in which said solution contains phosphate ions tending to stabilize hydrogen peroxide.