US4487949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of alkyl silicates
Assignee: Union Carbide Corp
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Filing: 1983-11-22
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Granted: 1984-12-11
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Expires: 2003-11-22
Abstract
Abstract Tetraalkyl orthosilicates may be prepared in good yield by contacting an alkanol having 1 to about 4 carbon atoms with copper-activated silicon synthesized by heating a mixture of cupric oxide and silicon particles at elevated temperatures at a temperature of about 120 DEG -250 DEG C. under autogeneous pressure.
Inventors
- 👤 Charles B. Mallon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:43
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
Method of synthesizing tetraalkyl orthosilicates which comprises the steps of: (A) calcining a mixture of cupric oxide and silicon particles containing about 1 to about 10 weight percent of cupric oxide at a temperature of about 400°-1,000° C. for at least about 0.5 hours under an inert gas atmosphere; and (B) contacting the mixture treated in step (A) with a stoichiometric excess of an alkanol, having one to about four carbons, based on the weight of silicon in said mixture, at a temperature of about 120°-250° C. until a tetraalkyl silicate is obtained.
Claim 2
Dependent Claim
93 words
Method of synthesizing tetraalkyl orthosilicates which comprises the steps of: (A) calcining a mixture of cupric oxide and silicon particles containing about 1 to about 10 weight percent of cupric oxide at a temperature of about 400°-1,000° C. for at least about 0.5 hours under an inert gas atmosphere; and (B) contacting the mixture treated in step (A) with a stoichiometric excess of an alkanol, having one to about four carbons, based on the weight of silicon in said mixture, at a temperature of about 120°-250° C. until a tetraalkyl silicate is obtained.
Claim 3
Dependent Claim
17 words
Method claimed in claim 1 wherein the cupric oxide is introduced in step (A) as cement copper.
Claim 4
Dependent Claim
22 words
Method claimed in claim 1 wherein the cupric oxide is introduced in step (A) contains about 2 to about 8% cupric oxide.
Claim 5
Dependent Claim
19 words
Method claimed in claim 1 wherein the mixture in step (A) contains about 5 to about 10% cupric oxide.
Claim 6
Dependent Claim
13 words
Method claimed in claim 1 wherein the alkanol in step (B) is ethanol.
Claim 7
Dependent Claim
13 words
Method claimed in claim 1 wherein the alkanol in step (B) is methanol.
Claim 8
Dependent Claim
13 words
Method claimed in claim 1 wherein the alkanol in step (B) is n-propanol.
Claim 9
Dependent Claim
13 words
Method claimed in claim 1 wherein the alkanol in step (B) is n-butanol.
Claim 10
Dependent Claim
15 words
Method claimed in claim 1 wherein the temperature is about 170° to about 190° C.
Claim 11
Dependent Claim
12 words
Method claimed in claim 1 wherein the inert gas atmosphere is nitrogen.
Claim 12
Dependent Claim
15 words
Method claimed in claim 1 wherein the temperature is about 500° to about 700° C.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |