US4447632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of alkyl silicates from silicon metal
Assignee: Akzo NV
•
Filing: 1983-04-18
•
Granted: 1984-05-08
•
Expires: 2003-04-18
Abstract
Abstract Ethyl orthosilicate is produced by contacting silicon metal with a mixture of methanol and ethanol in the presence of a catalytic amount of an alkali metal carbonate or bicarbonate at a temperature of at least 130 DEG C. The methyl orthosilicates produced are converted to ethyl orthosilicate by transesterification with ethanol.
Inventors
- 👤 Charles B. Mallon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:30
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
Process for production of alkyl silicates from silicon metal which comprises contacting finely divided silicon metal with a mixture of methanol and ethanol containing at least 10% methanol by weight at a temperature of at least about 130° C. in the presence of a catalytic amount of a carbonate or bicarbonate of an alkali metal until methyl orthosilicate, ethyl orthosilicate and mixtures of methyl ethyl silicates are formed.
Claim 2
Dependent Claim
68 words
Process for production of alkyl silicates from silicon metal which comprises contacting finely divided silicon metal with a mixture of methanol and ethanol containing at least 10% methanol by weight at a temperature of at least about 130° C. in the presence of a catalytic amount of a carbonate or bicarbonate of an alkali metal until methyl orthosilicate, ethyl orthosilicate and mixtures of methyl ethyl silicates are formed.
Claim 3
Dependent Claim
24 words
Method claimed in claim 1 wherein the methyl orthosilicates are subjected to transesterification with ethanol until said methyl orthosilicates are converted to ethyl orthosilicate.
Claim 4
Dependent Claim
11 words
Method claimed in claim 1 wherein the catalyst is potassium carbonate.
Claim 5
Dependent Claim
11 words
Method claimed in claim 1 wherein the catalyst is sodium carbonate.
Claim 6
Dependent Claim
11 words
Method claimed in claim 1 wherein the catalyst is lithium carbonate.
Claim 7
Dependent Claim
11 words
Method claimed in claim 1 wherein the catalyst is sodium bicarbonate.
Claim 8
Dependent Claim
15 words
Method claimed in claim 1 wherein the temperature is about 175° to about 185° C.
Claim 9
Dependent Claim
17 words
Process claimed in claim 1 wherein the ratio of methanol to ethanol is about 50/50 by weight.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |