US4364872A
Expired / Lapsed
US
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Method of making aluminum alkyls
Assignee: Albemarle Corp
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Filing: 1981-07-13
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Granted: 1982-12-21
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Expires: 2001-07-13
Abstract
Abstract A method of making trimethylaluminum wherein an aluminum trialkyl having at least two carbon atoms in the alkyl group is reacted with a methyl halide in the presence of a bismuth catalyst to form trimethylaluminum and an alkyl halide. A hydrocarbon solvent provides increased reaction rates.
Inventors
- 👤 Steven P. Diefenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:29
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/062
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
A method of effecting an alkyl exchange reaction, comprising reacting trialkylaluminum having at least two carbon atoms in the alkyl group with methyl halide in the presence of a bismuth-based catalyst to form an alkyl halide having at least two carbon atoms and an alkyl aluminum product containing at least some aluminum to methyl bonds, said bismuth-based catalyst comprising a bismuth compound which is capable of forming an alkyl bismuth bond or an aryl bismuth bond in the reaction.
Claim 2
Independent Claim
79 words
A method of effecting an alkyl exchange reaction, comprising reacting trialkylaluminum having at least two carbon atoms in the alkyl group with methyl halide in the presence of a bismuth-based catalyst to form an alkyl halide having at least two carbon atoms and an alkyl aluminum product containing at least some aluminum to methyl bonds, said bismuth-based catalyst comprising a bismuth compound which is capable of forming an alkyl bismuth bond or an aryl bismuth bond in the reaction.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein the methyl halide is selected from the group consisting of methyl chloride and methyl bromide.
Claim 4
Dependent Claim
12 words
The method of claim 1, wherein the methyl halide is methyl bromide.
Claim 5
Dependent Claim
12 words
The method of claim 1, wherein the methyl halide is methyl chloride.
Claim 6
Dependent Claim
13 words
The method of claim 1, wherein the bismuth compound is a bismuth trihalide.
Claim 7
Dependent Claim
13 words
The method of claim 1, wherein the bismuth compound used is bismuth trichloride.
Claim 8
Dependent Claim
15 words
The method of claim 1, wherein the bismuth compound used is a trihydrocarbyl bismuth compound.
Claim 9
Dependent Claim
13 words
The method of claim 1, wherein the bismuth compound used is triphenyl bismuth.
Claim 10
Independent Claim
32 words
A method of making trimethylaluminum, comprising the following catalyzed exchange reaction: ##STR2## wherein R=C 2 -C 4 alkyl group X=bromine or chlorine Catalyst includes bismuth trichloride or triphenyl bismuth or bismuth trihalide.
Claim 11
Independent Claim
32 words
A method of making trimethylaluminum, comprising the following catalyzed exchange reaction: ##STR2## wherein R=C 2 -C 4 alkyl group X=bromine or chlorine Catalyst includes bismuth trichloride or triphenyl bismuth or bismuth trihalide.
Claim 12
Dependent Claim
11 words
The method of claim 9, wherein R is an ethyl group.
Claim 13
Dependent Claim
9 words
The method of claim 9, wherein X is bromine.
Claim 14
Dependent Claim
9 words
The method of claim 9, wherein X is chlorine.
Claim 15
Dependent Claim
23 words
The method of claim 1, wherein the reaction is carried out at a temperature of from about 50° C. to about 150° C.
Claim 16
Dependent Claim
18 words
The method of claim 1, wherein the reaction is carried out at a temperature of about 100°-115° C.
Claim 17
Dependent Claim
17 words
The method of claim 1, wherein the reaction is carried out in up to about 24 hours.
Claim 18
Dependent Claim
32 words
The method of claim 1, wherein the reaction is carried out in the presence of a hydrocarbon solvent which does not alkylate with either the aluminum alkyl compounds or the alkyl halides.
Claim 19
Dependent Claim
15 words
The method of claim 16, wherein the hydrocarbon solvent is a cyclic or acyclic aliphatic.
Claim 20
Dependent Claim
13 words
The method of claim 16, wherein the hydrocarbon solvent is cyclohexane or decane.
Claim 21
Dependent Claim
20 words
The method of claim 1, wherein the reaction is carried out at a temperature of at least about 90° C.
Claim 22
Independent Claim
34 words
A method of making trimethylaluminum, comprising reacting triethylaluminum and methyl bromide in the presence of a bismuth chloride or triphenyl bismuth catalyst at a temperature of about 115° C. for at least one hour.
Claim 23
Independent Claim
34 words
A method of making trimethylaluminum, comprising reacting triethylaluminum and methyl bromide in the presence of a bismuth chloride or triphenyl bismuth catalyst at a temperature of about 115° C. for at least one hour.
Claim 24
Dependent Claim
10 words
The method of claim 1, wherein said trialkylaluminum is triethylaluminum.
Claim 25
Dependent Claim
17 words
The method of claim 1, wherein said trialkylaluminum is triethylaluminum and said methyl halide is methyl bromide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |