US4288604A
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Method for the production of tetraalkyl silicates
Assignee: Akzo America Inc
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Filing: 1980-05-19
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Granted: 1981-09-08
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Expires: 2000-05-19
Abstract
Abstract Tetraalkyl silicates are produced by the reaction of silicon metal with an alkanol in the presence of an alkali metal salt of an alkoxyalkoxy alcohol or a polyalkylene glycol in either an alkoxyalkoxy alcohol or a polyalkylene glycol or mixtures thereof and recovery of the product. Tetramethyl silicate and tetraethyl silicate are the preferred products. The preferred alkoxyalkoxy alcohol is 2-(2-butoxyethoxy)ethanol. The preferred glycol is diethylene glycol. An indifferent solvent and/or a hydroxide-scavenger may be employed in the reaction mixture.
Inventors
- 👤 Walter L. Magee
- 👤 Jeffrey E. Telschow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:51
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
82 words
A process for the production of tetraalkyl orthosilicates which comprises reacting a source of silicon metal with an alkanol having 1 to 6 carbon atoms in the presence of an alkali metal salt of a high-boiling alcohol selected from the group consisting of compounds of the formula R"O(CHR"'CH 2 O) n H where R" is hydrogen, ethyl, butyl, methyl, propyl, hexyl, cyclohexyl, or 2-ethylhexyl, R"' is hydrogen or methyl, n is equal to 2, 3, or 4, their isomers or mixtures thereof.
Claim 2
Dependent Claim
82 words
A process for the production of tetraalkyl orthosilicates which comprises reacting a source of silicon metal with an alkanol having 1 to 6 carbon atoms in the presence of an alkali metal salt of a high-boiling alcohol selected from the group consisting of compounds of the formula R"O(CHR"'CH 2 O) n H where R" is hydrogen, ethyl, butyl, methyl, propyl, hexyl, cyclohexyl, or 2-ethylhexyl, R"' is hydrogen or methyl, n is equal to 2, 3, or 4, their isomers or mixtures thereof.
Claim 3
Dependent Claim
63 words
The process of claim 1 wherein the reaction is carried out in the presence of a high-boiling alcohol selected from the group consisting of compounds of the formula R"O(CHR"'CH 2 O) n H where R" is hydrogen, ethyl, butyl, methyl, propyl, hexyl, cyclohexyl, or 2-ethylhexyl, R"' is hydrogen or methyl, n is equal to 2, 3, or 4, their isomers or mixtures thereof.
Claim 4
Dependent Claim
67 words
The process of claim 1 wherein the alkali metal salt is a potassium salt prepared from potassium hydroxide and a high-boiling alcohol selected from the group consisting of compounds of the formula R"O(CHR"'CH 2 O) n H where R" is hydrogen, ethyl, butyl, methyl, propyl, hexyl, cyclohexyl, or 2-ethylhexyl, R" is hydrogen or methyl, n is equal to 2, 3, or 4, their isomers or mixtures thereof.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein there are 2 to 4 moles of alkanol for each mole of silicon.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the alkanol is ethyl alcohol.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the alkanol is methyl alcohol.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein the high-boiling alcohol has the formula R""OCH 2 CH 2 OCH 2 CH 2 OH and R"" is selected from the group consisting of ethyl, butyl, cyclohexyl, hexyl, and 2-ethylhexyl moieties.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the high-boiling alcohol is 2-(2-butoxyethoxy)ethanol.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the alkali metal salt is selected from the group consisting of potassium, sodium, or lithium salts.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the alkali metal is potassium.
Claim 12
Dependent Claim
18 words
The process of claim 1 which includes the additional step of separating the product from the reaction mass.
Claim 13
Dependent Claim
13 words
The process of claim 11 wherein the separation is carried out by distillation.
Claim 14
Dependent Claim
29 words
The process of claim 1 wherein the source of silicon metal is a powder about 70 or more percent of which comprises particles less than 50 micrometers in diameter.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein the high-boiling alcohol is triethylene glycol.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein the high-boiling alcohol is diethylene glycol.
Claim 17
Dependent Claim
12 words
The process of claim 1 wherein the process is carried out continuously.
Claim 18
Dependent Claim
12 words
The process of claim 2 wherein the process is carried out continuously.
Claim 19
Dependent Claim
18 words
The process of claim 2 wherein the process is carried out in the presence of an indifferent solvent.
Claim 20
Dependent Claim
14 words
The process of claim 2 wherein the process is carried out employing a hydroxide-scavenger.
Claim 21
Dependent Claim
24 words
The process of claim 19 wherein the hydroxide-scavenger is added to the alkali metal salt solution before addition of the source of silicon metal.
Claim 22
Dependent Claim
26 words
The process of claim 19 wherein the hydroxide-scavenger is selected from the group consisting of carbon dioxide, tetraethyl orthosilicate, tetramethyl orthosilicate, diethyl carbonate, and dimethyl carbonate.
Claim 23
Dependent Claim
43 words
In a process for the production of tetraalkyl orthosilicates by reacting a source of silicon metal with an alkanol having 1 to 6 carbon atoms in the presence of an alkali metal salt of an alcohol the improvement which comprises employing a hydroxide-scavenger.
Claim 24
Dependent Claim
43 words
In a process for the production of tetraalkyl orthosilicates by reacting a source of silicon metal with an alkanol having 1 to 6 carbon atoms in the presence of an alkali metal salt of an alcohol the improvement which comprises employing a hydroxide-scavenger.
Claim 25
Dependent Claim
24 words
The process of claim 22 wherein the hydroxide-scavenger is added to the alkali metal salt solution before addition of the source of silicon metal.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |