US3963793A
Expired / Lapsed
US
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Process for preparing dehydrodimerization products
Assignee: Stamicarbon BV
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Filing: 1974-12-18
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Granted: 1976-06-15
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Expires: 1994-12-18
Abstract
Abstract The invention relates to catalytic dehydrodimerization of compounds of the formula CH 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.
Inventors
- 👤 Cornelis A. M. Weterings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:32
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/681; B01J23/90; B01J23/96; C; C07; C07C; C07C2/00; C07C2/76; B01J35/61; B01J35/613; B01J35/615; C07C2521/00; C07C2521/10; C07C2523/00; C07C2523/08; C07C2523/16; C07C2523/18; C07C2523/38; C07C2523/48; C07C2523/50; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
138 words
In a process for dehydrodimerization compounds of the formula CH 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 3 -- and R are attached to each other by bonding of said methyl group to said unsaturated carbon atom; comprising contacting CH 3 --R with a dehydrodimerization catalyst at elevated temperatures, the improvement comprising, contacting R--CH 3 at temperatures between 300°-400°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 2 /g wherein the catalyst comprises 10-80% by weight of the support.
Claim 2
Dependent Claim
138 words
In a process for dehydrodimerization compounds of the formula CH 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 3 -- and R are attached to each other by bonding of said methyl group to said unsaturated carbon atom; comprising contacting CH 3 --R with a dehydrodimerization catalyst at elevated temperatures, the improvement comprising, contacting R--CH 3 at temperatures between 300°-400°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 2 /g wherein the catalyst comprises 10-80% by weight of the support.
Claim 3
Dependent Claim
15 words
The improvement of claim 1 wherein said surface area is over 50 m 2 /g.
Claim 4
Dependent Claim
12 words
The improvement of claim 1 wherein said carrier material is magnesium oxide.
Claim 5
Dependent Claim
27 words
The improvement of claim 1 wherein said catalytic composition contains silver as a promoter in an amount of 1 to 50% by weight based on the catalyst.
Claim 6
Dependent Claim
20 words
The improvement of claim 4 wherein the combined amount of catalyst and promoter is 10-80% by weight of the carrier.
Claim 7
Dependent Claim
20 words
The improvement of claim 5 wherein said combined amount of catalyst and promoter is 50% by weight of said carrier.
Claim 8
Dependent Claim
15 words
The improvement of claim 2 characterized in that 1,5-hexadiene is prepared by dehydrodimerization of propene.
Claim 9
Dependent Claim
15 words
The improvement of claim 2 characterized in that 2,5-dimethyl-1,5-hexadiene is prepared by dehydrodimerization of isobutene.
Claim 10
Dependent Claim
16 words
The improvement of claim 2 characterized in that 1,2-diphenyl ethane is prepared by dehydrodimerization of toluene.
Claim 11
Dependent Claim
127 words
A process for dehydrodimerization compounds of the formula CH 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 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 2 /g, wherein said catalyst is 10-80% by weight of the support; and contacting CH 3 --R with the supported catalyst at temperatures between 300° to 400°C.
Claim 12
Dependent Claim
127 words
A process for dehydrodimerization compounds of the formula CH 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 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 2 /g, wherein said catalyst is 10-80% by weight of the support; and contacting CH 3 --R with the supported catalyst at temperatures between 300° to 400°C.
Claim 13
Dependent Claim
19 words
The process of claim 10 wherein said CH 3 --R is an olefin of at least 3 carbon atoms.
Claim 14
Dependent Claim
28 words
The process of claim 10 wherein CH 3 --R is an alkyl substituted or an alkenyl substituted benzene, said alkyl and alkenyl containing one to four carbon atoms.
Claim 15
Dependent Claim
15 words
The process of claim 10, wherein said element is beryllium, calcium, strontium, barium or magnesium.
Claim 16
Dependent Claim
11 words
The process of claim 10, wherein said catalyst is thallium oxide.
Claim 17
Dependent Claim
14 words
The process of claim 14, wherein said thallium oxide is admixed with bismuth trioxide.
Claim 18
Dependent Claim
26 words
The process of claim 14, wherein said catalyst contains silver as a promoter in an amount of 1 to 50% by weight based on said catalyst.
Claim 19
Dependent Claim
26 words
The process of claim 15, wherein said catalyst contains silver as a promoter in an amount of 1 to 50% by weight based on the catalyst.
Claim 20
Dependent Claim
36 words
The improvement of claim 1, wherein R--CH 3 is an olefin of at least 3 carbon atoms, an alkyl-substituted benzene or an alkenyl-substituted benzene, each of said alkyl and alkenyl containing 1 to 4 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |