Patent US3872145A successfully refreshed from Google Patents.
US3872145A
Expired / Lapsed
US
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Process for obtaining trimethylvinylsilane by liquid-liquid extraction
Assignee: Rhone Poulenc SA
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Filing: 1973-11-21
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Granted: 1975-03-18
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Expires: 1993-11-21
Abstract
Abstract A trimethylvinylsilane containing less than 0.1 percent w/w tetrahydrofuran is obtained by subjecting a mixture of trimethylvinylsilane and tetrahydrofuran to liquid-liquid extraction with water. The mixtures are obtained by vinylation of trimethylchlorosilane in tetrahydrofuran and separated by counter current extraction with water.
Inventors
- 👤 Jacques Breysse
- 👤 Gilbert Joseph Marin
- 👤 Marcel Lefort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:36
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/0825; C07F7/0832
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
A PROCESS FOR OBTAINING A TRIMETHYLVINYLSILANE CONTAINING LESS THAN 0.01 PERCENT W W OF TETRAHYDROFURAN FROM A MIXTURE OF TRIMETHYLVINYLSILANE AND TETRYDROFURAN, WHEREIN THE MIXTURE OF TRIMETHYLVINYLSILANE AND TETRAHYDROFURAN IS SUBJECTED TO LIQUID-LIQUID EXTRACTION USING WATER AS THE SOLVENT.
Claim 2
Dependent Claim
39 words
A PROCESS FOR OBTAINING A TRIMETHYLVINYLSILANE CONTAINING LESS THAN 0.01 PERCENT W W OF TETRAHYDROFURAN FROM A MIXTURE OF TRIMETHYLVINYLSILANE AND TETRYDROFURAN, WHEREIN THE MIXTURE OF TRIMETHYLVINYLSILANE AND TETRAHYDROFURAN IS SUBJECTED TO LIQUID-LIQUID EXTRACTION USING WATER AS THE SOLVENT.
Claim 3
Dependent Claim
39 words
A process according to claim 1 wherein the mixture of trimethylvinylsilane and tetrahydrofuran is obtained by distilling the reaction mixture obtained by vinylation of trimethylchlorosilane using magnesium, this vinylation being carried out in tetrahydrofurane using vinyl chloride and magnesium.
Claim 4
Dependent Claim
37 words
A process according to claim 1 wherein the mixture of trimethylvinylsilane and tetrahydrofuran contains at least one impurity which is vinyl chloride, trimethylsilane butadiene or hexamethyldisiloxane, the proportion of total impurity being less than 10 percent w/w.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein the content of trimethylvinylsilane in the mixture is greater than 65 percent w/w.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein the liquid-liquid extraction is carried out in counter-current in a column.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein the liquids subjected to liquid-liquid extraction are stirred.
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein the liquid-liquid extraction is carried out in a column comprising at least five theoretical plates.
Claim 9
Dependent Claim
34 words
A process according to claim 7 wherein the ratio of the flow rate of the water to the flow rate of the mixture is 3:1 to 6:1 and the column comprises 5-10 theoretical plates.
Claim 10
Dependent Claim
23 words
A process according to claim 5 wherein the water and the mixture are introduced into the column at a rate of 1-15 m3/hour/m2.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |