# US 7,612,007 B2 · Process for regenerating catalyst

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- Number: US 7,612,007 B2
- Document ID: US7612007B2
- Status: Granted
- Kind: B2
- Application number: 11/819,463
- Filed: 2007-06-27
- Published: 2008-01-03
- Granted: 2009-11-03
- Earliest claimed: 2006-06-28
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Naoki Miura; Koichi Nagai; Noriaki Suyasu
- Web page: https://patentgrep.com/patent/US7612007B2

## CPC

- C07C 51/252: {of propene, butenes, acrolein or methacrolein}
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/8876: {Arsenic, antimony or bismuth}
- B01J 23/94: of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper
- B01J 38/04: Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
- B01J 38/12: Treating with free oxygen-containing gas
- C07C 45/42: by hydrolysis
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- Y02P 20/584: Recycling of catalysts
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A process for regenerating a catalyst consisting of a mixed oxide having molybdenum, bismuth and iron used for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid by catalytically oxidizing propylene, isobutylene and/or tert.-butanol with molecular oxygen in a gas phase, in which the catalyst is regenerated by thermally treating the deteriorated catalyst in an atmosphere of a gas containing molecular oxygen at a temperature of 200 to 500° C., and then thermally treating the catalyst in the presence of a reducing compound at a temperature of 200 to 500° C.

## Claims

### Claim 1

A process for regenerating a catalyst consisting of a mixed oxide comprising molybdenum, bismuth and iron, which is used for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid by catalytically oxidizing at least one compound selected from the group consisting of propylene, isobutylene and tert.-butanol with molecular oxygen in a gas phase, which process comprises the steps of:
thermally treating the deteriorated catalyst having a decreased catalytic activity in an atmosphere of a gas containing molecular oxygen at a temperature of 200 to 500° C., and then thermally treating the catalyst in the presence of a reducing compound at a temperature of 200 to 500° C.

### Claim 2 (depends on 1)

The process according to claim 1, wherein said reducing compound is at least one compound selected from the group consisting of hydrogen, ammonia, carbon monoxide, hydrocarbons having 1 to 6 carbon atoms, alcohols having 1 to 6 carbon atoms, aldehydes having 1 to 6 carbon atoms and amines having 1 to 6 carbon atoms.

### Claim 3 (depends on 1)

A process for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid comprising the step of:
catalytically oxidizing at least one compound selected from the group consisting of propylene, isobutylene and tert.-butanol with molecular oxygen in a gas phase in the presence of a catalyst which is regenerated by a process for regenerating a catalyst according to claim 1.