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US 3,963,793 AGranted
Process for preparing dehydrodimerization products
AssigneeStamicarbon B.V.
InventorCornelis A. M. Weterings
Life of this patent
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Abstract
The invention relates to catalytic dehydrodimerization of compounds of the formula CH.sub.3 --R wherein R represents a group which is not reactive under the reaction conditions and is bonded to the methyl group by a carbon atom connected to an adjacent atom by an unsaturated bond, by catalysts, including bismuth trioxide, thallium trioxide or mixtures thereof, which are supported on basic carrier materials of high surface area.
Claims18
In a process for dehydrodimerization compounds of the formula CH.sub.3 --R,
- wherein R represents a group that is not reactive under the dehydrodimerization reaction:
- wherein R contains a carbon atom which is unsaturated, wherein CH.sub.3 -- and R are attached to each other by bonding of said methyl group to said unsaturated carbon atom;
- comprising contacting CH.sub.3 --R with a dehydrodimerization catalyst at elevated temperatures,
- the improvement comprising, contacting R--CH.sub.3 at temperatures between 300.degree.-400.degree.C with a catalytic composition comprising a catalyst on a support, wherein said catalyst is thallium trioxide, bismuth trioxide or mixtures thereof;
- said support comprising an oxide of an element of Group II of the Periodic Table of Elements and having a surface area of at least 20 m.sup.2 /g wherein the catalyst comprises 10-80% by weight of the support.
2 more elements
A process for dehydrodimerization compounds of the formula CH.sub.3 --R,
- wherein R represents a group that is not reactive under the dehydrodimerization reaction:
- wherein R contains a carbon atom which is unsaturated, wherein CH.sub.3 -- and R are attached to each other by bonding of said methyl group to said unsaturated carbon atom;
- said process comprising
- providing a support-catalyst composition wherein said catalyst is thallium trioxide, bismuth trioxide or mixtures thereof and said support is an oxide of an element of Group II of the Periodic Table of Elements and has a surface area of over 20 m.sup.2 /g, wherein said catalyst is 10-80% by weight of the support;
- and
- contacting CH.sub.3 --R with the supported catalyst at temperatures between 300.degree. to 400.degree.C.
3 more elements
Dependencies are inferred from the claim text.