# US 4,400,304 A · Catalyst pellets with resin binder for decomposition of hypochlorite

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- Number: US 4,400,304 A
- Document ID: US4400304A
- Status: Granted
- Kind: A
- Application number: 06/216,042
- Filed: 1980-12-15
- Granted: 1983-08-23
- Earliest claimed: 1979-10-04
- Assignees: Pennwalt Corporation
- Inventors: Roger T. Clark; David M. Gardner
- Web page: https://patentgrep.com/patent/US4400304A

## CPC

- B01J 23/78: with alkali- or alkaline earth metals
- B01J 21/04: Alumina
- B01J 21/12: Silica and alumina
- B01J 21/14: Silica and magnesia
- B01J 23/94: of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper
- B01J 31/06: containing polymers {(organometallic polymers B01J31/123; polymer-bound organometallic complexes B01J31/165; coordination polymers B01J31/1691)}
- B01J 31/1633: {covalent linkages via silicon containing groups}
- B01J 31/26: containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J 31/28: of the platinum group metals, iron group metals or copper
- B01J 37/0201: {Impregnation}
- B01J 37/03: Precipitation; Co-precipitation
- B01J 37/06: Washing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 38/48: Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- C01B 13/0203: {from inorganic compounds}
- B01J 2531/16: Copper
- B01J 2531/22: Magnesium
- B01J 2531/845: Cobalt
- B01J 2531/847: Nickel
- C02F 1/705: {Reduction by metals}
- C02F 2303/185: The treatment agent being halogen or a halogenated compound
- Y02P 20/584: Recycling of catalysts
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A porous catalyst matrix used for the decomposition of aqueous hypochlorite solutions is disclosed along with the process for its use. The catalyst is prepared by sintering a powdered mixture of a particular metal oxide or hydroxide and a thermoplastic polyolefin or halogenated polyolefin.

## Claims

### Claim 1

A porous catalyst matrix in pellet form consisting essentially of a mixture of a powdered oxide or hydroxide of a metal selected from the group consisting of iron, copper, magnesium, nickel and cobalt, and a powdered thermoplastic organic resin comprising polyvinylidene fluoride in a weight ratio of oxide or hydroxide of metal to resin within 1:1 to 15:1, which mixture of powders has been compacted into pellets and then thermally sintered at or about the softening temperature of the resin, thereby forming a porous ctalyst matrix in pellet form which is stable in aqueous hypochlorite solutions.

### Claim 2 (depends on 1)

The porous catalyst matrix in pellet form of claim 1 in which the pellet size is about one-eight of an inch in diameter and three-sixteenths of an inch in length.

### Claim 3 (depends on 1)

The porous catalyst matrix of claim 1 in which the pellets have been crushed and screened to a particle size of 18 to 35 mesh.