US4161487A
Expired / Lapsed
US
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Process for the hydrolysis and condensation of alkyl/aryl-trichlorosilanes
Assignee: Evonik Operations GmbH
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Filing: 1977-10-18
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Granted: 1979-07-17
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Expires: 1997-10-18
Abstract
Abstract A method for hydrolysis and condensation of alkyl/aryl-trichlorosilanes wherein the chlorosilanes are dissolved in liquid hydrogen chloride and the solution is hydrolized at a pressure of 15 to 80 atmospheres and at a temperature of -17° to +47° C. and water is present in an amount of 0.165 to 0.465 moles per chlorine atom attached to a silicon atom. After condensation, the reaction product is freed from hydrochloric acid and unhydrolyzed silanes. Also disclosed are new chlorosilanes prepared by the process of the invention.
Inventors
- 👤 Dieter Borner
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:52
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A process for the hydrolysis and condensation of alkyl/aryl-trichlorosilanes containing up to 40 mole % of dialkyl, diaryl, or alkylaryldichlorosilanes comprising dissolving the chlorosilanes in liquid hydrogen chloride and carrying out the hydrolysis at a pressure of 15 to 80 atmospheres and a temperature of -17° to +47° C. with water in an amount of 0.165 to 0.465 moles per chlorine atom attached to a silicon atom, and after subsequent condensation, freeing the reaction product from HCl and from silanes that have not been hydrolyzed.
Claim 2
Dependent Claim
85 words
A process for the hydrolysis and condensation of alkyl/aryl-trichlorosilanes containing up to 40 mole % of dialkyl, diaryl, or alkylaryldichlorosilanes comprising dissolving the chlorosilanes in liquid hydrogen chloride and carrying out the hydrolysis at a pressure of 15 to 80 atmospheres and a temperature of -17° to +47° C. with water in an amount of 0.165 to 0.465 moles per chlorine atom attached to a silicon atom, and after subsequent condensation, freeing the reaction product from HCl and from silanes that have not been hydrolyzed.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the reaction product is freed from HCl and silanes that have not been hydrolyzed by releasing the pressure.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the reaction product is freed from HCl and silanes that have not been hydrolyzed by raising the temperature.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the reaction product is freed from HCl and silanes that have not been hydrolyzed by releasing the pressure and raising the temperature.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the water required for hydrolysis is added in the form of an aqueous solution of HCl.
Claim 7
Dependent Claim
28 words
The process of claim 5 wherein the required water is added in the form of an aqueous HCl solution which is saturated under the conditions of the reaction.
Claim 8
Dependent Claim
99 words
The process of claim 1 wherein the halogen silanes are dissolved in liquid hydrogen chloride in a pressure reactor, gaseous HCl is dissolved in water in a second pressure vessel until a solution is obtained which is saturated with HCl under the conditions in the pressure reactor, feeding the aqueous HCl solution continuously from the pressure vessel into the pressure reactor at a rate corresponding to the rate of the reaction and after the required amount of water has been added, releasing the pressure in the pressure reactor collecting the escaping HCl gas and drawing off the reaction product.
Claim 9
Dependent Claim
32 words
The process of claim 7 wherein after adding the water, the mixture is allowed to react for an additional time period of from 15 minutes to 2 hours before releasing the pressure.
Claim 10
Dependent Claim
23 words
The process of claim 7 wherein the reaction product is heated to a temperature up to 200° C. before it is drawn off.
Claim 11
Dependent Claim
16 words
A compound having the formula ##EQU3## in which b has a value of 0.27 to <0.42.
Claim 12
Dependent Claim
16 words
A compound having the formula ##EQU3## in which b has a value of 0.27 to <0.42.
References Cited (Backward Citations)
US3489782A
Cited
US3687642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-16 | 1983-01-15 | 1983-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-16 | 1987-01-15 | 1987-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-16 | 1991-01-15 | 1991-07-17 | $7700.00 | Window Closed / Lapsed |