# US 7,407,591 B2 · Process for the reduction of activated chromium oxide catalyst

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,407,591 B2
- Document ID: US7407591B2
- Status: Granted
- Kind: B2
- Application number: 11/587,332
- Filed: 2005-04-21
- Published: 2007-09-20
- Granted: 2008-08-05
- Earliest claimed: 2004-04-30
- Assignees: Basell Polyolefine GmbH
- Inventors: Achille De Battisti; Pier Luigi Di Federico; Dinara Iantilina; Christian Urgeghe
- Web page: https://patentgrep.com/patent/US7407591B2

## CPC

- B01J 23/26: Chromium
- A62D 3/37: by reduction, e.g. hydrogenation
- B01J 37/16: Reducing
- A62D 2101/43: containing heavy metals, in the bonded or free state
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A62D: CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS

## Abstract

Process for the reduction of a hexavalent chromium oxide based catalyst comprising contacting, under mixing conditions, a hexavalent chromium oxide based catalyst, with a molar excess, in respect of the chromium species, of a solid reducing agent and subjecting the mixture to a temperature in the range 30-1000° C. The process is simple, involves low costs and allows to obtain a permanently reduced chromium catalyst that can be disposed without toxicity risks.

## Claims

### Claim 1

A process for the reduction of a conventional Phillips catalyst comprising a chromium species, the process comprising contacting, under mixing conditions, said conventional Phillips catalyst, with a molar excess, in respect of the chromium species, of a solid reducing agent selected from monosaccharides, disaccharides or polysaccharides and subjecting the so obtained mixture to a temperature in the range of from 50 to 1000° C.

### Claim 2 (depends on 1)

The process according to claim 1 wherein the solid reducing agent is selected from disaccharides, and the temperature ranges from 50 to 300° C.

### Claim 3 (depends on 1)

The process according to claim 1 wherein the solid reducing agent is selected from glucose, fructose or sucrose.

### Claim 4 (depends on 3)

The process according to claim 3 wherein the solid reducing agent is sucrose.

### Claim 5 (depends on 1)

The process according to claim 1 carried out in a continuous mixing reactor.