# US 4,400,574 A · Isomerization catalyst and process for production thereof

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- Number: US 4,400,574 A
- Document ID: US4400574A
- Status: Granted
- Kind: A
- Application number: 06/309,495
- Filed: 1981-10-06
- Granted: 1983-08-23
- Earliest claimed: 1979-08-15
- Assignees: Nippon Oil Co., Ltd.
- Inventors: Tokuo Fujiso; Soichi Nomura; Tadashi Ohmori
- Web page: https://patentgrep.com/patent/US4400574A

## CPC

- B01J 27/06: Halogens; Compounds thereof
- C07C 5/2772: {with metal oxides}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process for converting linear aliphatic olefins into branched-chain aliphatic olefins, by contacting said linear aliphatic olefins with a comprising an active alumina carrier and fluorine and chlorine supported thereon, the amounts of fluorine and chlorine supported being 0.2 to 2.0% by weight, and 0.2 to 4.0% by weight, respectively, based on the total weight of the catalyst composition. The aforesaid isomerization catalyst can be produced by contacting an active alumina carrier with at least one halogenated hydrocarbon containing fluorine and chlorine in the molecule at a temperature of 200.degree. to 500.degree. C.

## Claims

### Claim 1

A method for converting a linear aliphatic olefin into a branched-chain aliphatic olefin, which comprises contacting at a temperature of 350.degree. to 550.degree. C. said linear aliphatic olefin with a catalyst composition consisting essentially of an active alumina carrier with fluorine and chlorine supported thereon, the amounts of fluorine and chlorine supported being 0.2 to 2.0% by weight, and 0.2 to 4.0% by weight, respectively, based on the total weight of the catalyst composition.

### Claim 2 (depends on 1)

The method of claim 1 wherein the linear and branched-chain aliphatic olefin has 4 or 5 carbon atoms.

### Claim 3 (depends on 1)

The method of claim 1 wherein said catalyst further comprises at least one oxide selected from the group consisting of silica, titania, zirconia, magnesia, chromia, thoria, molybdena, tungsten oxide and iron oxide.

### Claim 4 (depends on 1)

The method of claim 1 wherein said catalyst is produced by a process which comprises contacting an active alumina carrier with at least one halogenated hydrocarbon containing fluorine and chlorine in the molecule at a temperature of 200.degree. to 500.degree. C.

### Claim 5 (depends on 4)

The method of claim 4 wherein prior to contacting the carrier with the halogenated hydrocarbon, the carrier is contacted with a water-containing gas to cause adsorption of water on the carrier, and the carrier having adsorbed water thereon is dried at a temperature of 350.degree. to 600.degree. C. for a period of 0.1 to 50 hours.

### Claim 6 (depends on 4)

The process of claim 4 wherein the halogenated hydrocarbon containing fluorine and chlorine is a compound expressed by the general formula
C.sub.m H.sub.n F.sub.x Cl.sub.y
wherein m is 1 to 2, n is 0 to 2, x is 1 to 5 and y is 1 to 5, provided that m+1=(n+x+y)/2.

### Claim 7 (depends on 1)

The process of claim 1 wherein said linear aliphatic hydrocarbon is admixed with a diluent gas.

### Claim 8 (depends on 1)

The process of claim 1 wherein said diluent gas is nitrogen, carbon dioxide, helium or hydrogen.