Patent US4830208A successfully refreshed from Google Patents.
Patent US3985781A successfully refreshed from Google Patents.
US3985781A
Expired / Lapsed
US
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Esterification method for trichlorosilane
Assignee: Dynamit Nobel AG
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Filing: 1975-02-27
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Granted: 1976-10-12
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Expires: 1995-02-27
Abstract
Abstract A process for the preparation of a partial or complete trichlorosilane ester of the formula H-Si(OR).sub.3-n Cl.sub.n wherein n is 0 or 1, R is an alkyl group of 1 to 11 carbon atoms, an alkyl group of 1 to 11 carbon atoms containing an oxygen atom in the chain, or an alkyl group of 1 to 11 carbon atoms containing a sulfur atom in the chain which comprises: 1. Forming a partial esterification product by contacting a trichlorosilane with up to a 10% stoichiometric excess of a primary alcohol, the stoichiometric amount corresponding to only partial esterification of said trichlorosilane, said contacting being conducted only in the liquid phase without any contact in the vapor phase; 2. Removing HCl formed from the reaction vessel; 3. Thereafter contacting the partial esterification product with additional primary alcohol and removing liberated residual HCl from the reaction vessel.
Inventors
- 👤 Hans Joachim Kotzsch
- 👤 Hans Joachim Vahlensieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:34
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/025; C07F7/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
141 words
A process for the preparation of a trichlorosilane ester of the formula H-Si(OR).sub.3.sub.-n Cl.sub.n wherein n = 0 or 1, R is an alkyl group of 1 to 11 carbon atoms, an alkyl group of 1 to 11 carbon atoms containing an oxygen atom in the chain or an alkyl group of 1 to 11 carbon atoms containing a sulfur atom in the chain which comprises 1. forming a partial esterification product by contacting trichlorosilane with up to a 10% stoichiometric excess of a primary alcohol, the stoichiometric amount corresponding to only partial esterification of said trichlorosilane, said contacting being conducted only in the liquid phase and without contact in the vapor phase; 2. removing HCl formed from the reaction vessel; 3. thereafter contacting the partial esterification product with additional primary alcohol and removing liberated residual HCl from the reaction vessel.
Claim 2
Dependent Claim
141 words
A process for the preparation of a trichlorosilane ester of the formula H-Si(OR).sub.3.sub.-n Cl.sub.n wherein n = 0 or 1, R is an alkyl group of 1 to 11 carbon atoms, an alkyl group of 1 to 11 carbon atoms containing an oxygen atom in the chain or an alkyl group of 1 to 11 carbon atoms containing a sulfur atom in the chain which comprises 1. forming a partial esterification product by contacting trichlorosilane with up to a 10% stoichiometric excess of a primary alcohol, the stoichiometric amount corresponding to only partial esterification of said trichlorosilane, said contacting being conducted only in the liquid phase and without contact in the vapor phase; 2. removing HCl formed from the reaction vessel; 3. thereafter contacting the partial esterification product with additional primary alcohol and removing liberated residual HCl from the reaction vessel.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein the reactants in steps 1 and 3 are maintained at a temperature below 100° C.
Claim 4
Dependent Claim
39 words
A process according to claim 1 wherein th primary alcohol is contacted with the trichlorosilane or partial esterification product thereof by passing it through a tube submerged beneath the liquid level of said trichlorosilane or partial esterification product thereof.
Claim 5
Dependent Claim
29 words
A process according to claim 1 wherein said primary alcohol is selected from the group consisting of methanol, ethanol, propanol, butanol, 2-methoxy-ethanol, diethyleneglycol monomethyl ether and ethylene glycol monoacetate.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein step 1 is carried out in the presence of a solvent.
Claim 7
Dependent Claim
15 words
A process according to claim 5 wherein the solvent consists essentially of a chlorinated hydrocarbon.
Claim 8
Dependent Claim
22 words
A process according to claim 6 wherein said chlorinated hydrocarbon is selected from the group consisting of trans-dichloroethylene, cis-dichloroethylene, trichloroethylene and perchloroethylene.
Claim 9
Dependent Claim
23 words
A process according to claim 5 wherein said solvent consists essentially of a liquid hydrocarbon having a boiling point up to 150° C.
Claim 10
Dependent Claim
22 words
A process according to claim 1 wherein HCl is removed from the reaction vessel within three hours of the completion of esterification.
Claim 11
Dependent Claim
18 words
A process according to claim 1 wherein the HCl is removed by heating the reaction mixture to boiling.
Claim 12
Dependent Claim
18 words
A process according to claim 1 wherein step 1 is carried out in the absence of a solvent.
Claim 13
Dependent Claim
18 words
A process according to claim 1 wherein step 3 is carried out in the absence of a solvent.
Claim 14
Dependent Claim
20 words
A process according to claim 1 wherein steps 1 and 3 are carried out in the absence of a solvent.
Claim 15
Dependent Claim
15 words
A process according to claim 5 wherein said solvent consists essentially of a benzine fraction.
Claim 16
Dependent Claim
13 words
A process according to claim 5 wherein said solvent consists essentially of benzene.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |