# US 4,394,255 A · Isomerization process

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- Number: US 4,394,255 A
- Document ID: US4394255A
- Status: Granted
- Kind: A
- Application number: 06/395,940
- Filed: 1982-07-07
- Granted: 1983-07-19
- Earliest claimed: 1982-07-07
- Assignees: Phillips Petroleum Company
- Inventors: Semyon Kukes; Gerhard P. Nowack; Marvin M. Johnson
- Web page: https://patentgrep.com/patent/US4394255A

## CPC

- C07C 5/2537: {Acids of phosphorus; Salts thereof; Phosphorus oxides}
- B01J 27/16: containing oxygen {, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr}
- C07C 5/2562: {with hydrides or organic compounds (C07C5/2543 takes precedence)}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

An aliphatic mono-olefin e.g. butene-2 is isomerized in the presence of a catalyst comprising zirconium phosphate and zirconium phosphate prepared from an aryl phosphonic acid to produce a corresponding terminal olefin selectively.

## Claims

### Claim 1

A process for the isomerization of an aliphatic mono-olefin hydrocarbon feed to shift the internal double bond therein to produce a corresponding terminal olefin which comprises subjecting said mono-olefin hydrocarbon under isomerization conditions to the action of a catalyst comprising zirconium phosphate and zirconium phosphonate wherein the catalyst used is prepared from an aryl phosphonic acid and a compound of zirconium.

### Claim 2 (depends on 1)

A process according to claim 1 wherein said aryl phosphonic acid is phenylphosphonic acid.

### Claim 3 (depends on 1)

A process according to claim 1 wherein the mono-olefin is at least one having from 4 to 20 inclusive carbon atoms.

### Claim 4 (depends on 3)

A process according to claim 3 wherein the mono-olefins are inclusive of a substantial portion of butene-2.

### Claim 5 (depends on 1)

A process according to claim 1 wherein the isomerization temperature is in the range of about 300.degree.-1100.degree. F.

### Claim 6 (depends on 1)

A process according to claim 1 wherein the catalyst is prepared by combining a solution of phenylphosphonic acid with a solution of a zirconium salt followed by recovery of the precipitate and drying same.