# US 4,400,571 A · Hydrocarbon isomerization process

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- Number: US 4,400,571 A
- Document ID: US4400571A
- Status: Granted
- Kind: A
- Application number: 06/417,255
- Filed: 1982-09-10
- Granted: 1983-08-23
- Earliest claimed: 1981-04-27
- Assignees: Uop LLC
- Inventors: Delmar W. Robinson
- Web page: https://patentgrep.com/patent/US4400571A

## CPC

- C10G 45/60: characterised by the catalyst used
- B01J 29/035: {Microporous crystalline materials not having base exchange properties, such as} silica polymorphs, e.g. silicalites
- C07C 4/08: by splitting-off an aliphatic or cycloaliphatic part from the molecule
- C07C 4/18: Catalytic processes
- C07C 5/2206: {Catalytic processes not covered by C07C5/23 - C07C5/31}
- C07C 5/2732: {Catalytic processes}
- C07C 6/00: Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
- C07C 6/123: {of only one hydrocarbon}
- C07C 2521/04: Alumina
- C07C 2529/035: Crystalline silica polymorphs, e.g. silicalites
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Hydrocarbons are converted by contacting them at hydrocarbon conversion conditions with a catalyst composite comprising from about 5 weight percent to about 95 weight percent of a silica polymorph consisting of crystalline silica, said silica polymorph after calcination in air at 600.degree. C. for one hour, having a mean refractive index of 1.39.+-.0.01 and a specific gravity at 25.degree. C. of 1.70.+-.0.05 g/cc and at least 5 weight percent to about 95 weight percent Ziegler alumina.

## Claims

### Claim 1

A process for the catalytic isomerization of a hydrocarbon which comprises contacting the hydrocarbon at hydrocarbon isomerization conditions with a catalytic composite comprising from about 5 weight percent to about 95 weight percent of a silica polymorph consisting of crystalline silica, said silica polymorph after calcination in air at 600.degree. C. for one hour, having a mean refractive index of 1.39.+-.0.01 and a specific gravity at 25.degree. C. of 1.70.+-.0.05 g/cc and at least 5 weight percent to about 95 weight percent Ziegler alumina.

### Claim 2 (depends on 1)

The process of claim 1 wherein said isomerization conditions include a temperature of about 75.degree. F. to about 900.degree. F., a pressure from about atmospheric to about 100 atmospheres, a hydrogen to hydrocarbon mole ratio of about 0.5:1 to about 20:1 and a liquid hourly space velocity (LHSV) of about 0.2 to about 10.

### Claim 3 (depends on 1)

The process of claim 1 wherein said hydrocarbon isomerization is conducted with a feedstock comprising paraffin hydrocarbons.

### Claim 4 (depends on 1)

The process of claim 1 wherein said hydrocarbon isomerization is conducted with a feedstock comprising alkylaromatic hydrocarbons.

### Claim 5 (depends on 1)

The process of claim 1 wherein said hydrocarbon isomerization is conducted with a feedstock comprising olefin hydrocarbons.