# US 4,393,263 A · Tertiary-butylstyrene production

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- Number: US 4,393,263 A
- Document ID: US4393263A
- Status: Granted
- Kind: A
- Application number: 06/116,659
- Filed: 1980-01-29
- Granted: 1983-07-12
- Earliest claimed: 1980-01-29
- Assignees: El Paso Products Company
- Inventors: Glen F. Crum; Samuel J. Paton
- Web page: https://patentgrep.com/patent/US4393263A

## CPC

- B01J 27/188: with chromium, molybdenum, tungsten or polonium
- B01J 23/30: Tungsten
- C07C 5/48: with oxygen as an acceptor
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

This invention provides an improved oxydehydrogenation process for the production of tertiary-butylstyrene which involves the contacting of a vapor phase mixture of tertiarybutylethylbenzene and oxygen with a novel coprecipitated aluminum-calcium-silicon-tungsten phosphate catalyst composition. The tertiary-butylstyrene is produced with a high conversion selectivity, and concomitantly there is little or no dialkenylbenzene byproduct produced.

## Claims

### Claim 1

A process for the production of tertiary-butylstyrene under oxydehydrogenation conditions which comprises contacting a feed mixture of tertiary-butylethylbenzene and oxygen at a temperature in the range between about 350.degree. C. and 650.degree. C. with a coprecipitated aluminum-calcium-silicon-tungsten phosphate catalyst, wherein the aluminum:calcium:silicon:tungsten elements, respectively, are present in the catalyst in an atomic ratio of about 1-12:1-12:0.2-5:2-20, and wherein the conversion selectivity to tertiary-butylstyrene is at least 80 mole percent, and the conversion selectivity to dialkenylbenzenes is essentially zero mole percent.

### Claim 2 (depends on 1)

A process in accordance with claim 1 wherein the feed mixture contains between about 0.2-5 moles of molecular oxygen per mole of tertiary-butylethylbenzene.

### Claim 3 (depends on 1)

A process in accordance with claim 1 wherein the feed mixture contains a gaseous inert diluent.

### Claim 4 (depends on 1)

A process in accordance with claim 1 wherein the feed mixture contains nitrogen, carbon dioxide and/or steam as a gaseous inert diluent.

### Claim 5 (depends on 1)

A process in accordance with claim 1 wherein the contact time between the feed stream and the catalyst is in the range between about 0.5 and 20 seconds.

### Claim 6 (depends on 1)

A process in accordance with claim 1 wherein the catalyst is supported on a carrier substrate.