# US 5,688,984 A · Porous lithium aluminate carrier of spinel structure for catalyst

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- Number: US 5,688,984 A
- Document ID: US5688984A
- Status: Granted
- Kind: A
- Application number: 08/652,729
- Filed: 1996-05-22
- Granted: 1997-11-18
- Earliest claimed: 1995-05-22
- Assignees: Ube Industries, Ltd.
- Inventors: Kyoji Ohdan; Tokuo Matsuzaki; Mikio Hidaka
- Web page: https://patentgrep.com/patent/US5688984A

## CPC

- B01J 23/04: Alkali metals
- B01J 23/005: {Spinels}
- C07C 68/00: Preparation of esters of carbonic or haloformic acids
- Y10S 502/524: Spinel
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A porous lithium aluminate carrier for catalyst has a spinel structure which has a mean pore diameter in the range of 40 to 1,000 angstroms and a total pore volume in the range of 0.2 to 1.5 mL/g. The porous lithium aluminate carrier can be used for supporting a catalyst compound containing a platinum group metal. The catalyst on the carrier can be favorably employed for promoting catalytic reaction of a nitrite ester and carbon monoxide to prepare a carbonate diester such as dimethyl carbonate.

## Claims

### Claim 1

A process for the preparation of a carbonate diester which comprises reacting a nitrite ester and carbon monoxide in the presence of a catalyst composition which comprises a carrier of a spinel structure having a mean pore diameter in the range of 40 to 1,000 angstroms and a total pore volume in the range of 0.2 to 1.5 mL/g and a catalyst component comprising a compound of a metal of platinum group.

### Claim 2 (depends on 1)

The process for the preparation of a carbonate diester of claim 1, in which the carbonate diester is a dialkyl carbonate and the nitrite ester is an alkyl nitrite.

### Claim 3 (depends on 1)

The process for the preparation of a carbonate diester of claim 1, in which the carbonate diester is dimethyl carbonate and the nitrite ester is methyl nitrite.

### Claim 4 (depends on 1)

The process of claim 1, wherein the reaction is performed further in the presence of a chlorine-containing gas.

### Claim 5 (depends on 1)

The process of claim 1, wherein the reaction is performed further in the presence of hydrogen chloride.