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US4506087A
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Method for the continuous preparation of alkoxysilanes
Assignee: Dynamit Nobel AG
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Filing: 1983-10-03
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Granted: 1985-03-19
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Expires: 2003-10-03
Abstract
Abstract A method for the continuous preparation of an alkoxysilane with hydrogen chloride contents of less than 20 ppm. In the method, the esterification is performed continuously in a reactor, and the raw esterification product is delivered to the top of a column. In this column, the reactant alcohol is vaporized and condensed at the top. The raw product drips from the top of the column to the bottom where it is collected as pure product. The method is suitable for the preparation of both tetraalkoxysilanes and of substituted alkoxysilanes. Partially condensed alkoxysilanes having a defined silicon dioxide content can also be made by this method.
Inventors
- 👤 Peter Fischer
- 👤 Reiner Groh
- 👤 Hans-Joachim Vahlensieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:20
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04; B; B01; B01J; B01J19/00; B01J19/18; B01J19/1868; B01J19/1881; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/188; C08; C08G; C08G77/00; C08G77/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method for the continuous preparation of monomeric or oligomeric alkoxysilanes comprising: introducing a chlorosilane in liquid form into a reactor; introducing in a gaseous phase at least a stoichiometric amount of alcohol into the lower part of a mass transfer apparatus and condensing the off stream of alcohol for introduction into the reactor; reacting the chlorosilane and alcohol in the reactor to form a reaction mixture; removing the formed hydrogen chloride from the reactor; introducing the reaction mixture into the top end of the mass transfer apparatus; and removing the reaction product from the apparatus.
Claim 2
Independent Claim
96 words
A method for the continuous preparation of monomeric or oligomeric alkoxysilanes comprising: introducing a chlorosilane in liquid form into a reactor; introducing in a gaseous phase at least a stoichiometric amount of alcohol into the lower part of a mass transfer apparatus and condensing the off stream of alcohol for introduction into the reactor; reacting the chlorosilane and alcohol in the reactor to form a reaction mixture; removing the formed hydrogen chloride from the reactor; introducing the reaction mixture into the top end of the mass transfer apparatus; and removing the reaction product from the apparatus.
Claim 3
Dependent Claim
65 words
The method of claim 1 wherein the chlorosilane is of the general formula R.sub.a.sup.1 R.sub.b.sup.2 SiCl.sub.4-a-b wherein a is 0, 1, 2 or 3; b is 0 or 1; a-b is equal to or greater than 3; R 1 and R 2 represent hydrogen, saturated or unsaturated hydrocarbon moieties capable of having terminal functional groups which are not attached under the conditions of the reaction.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the alcohol is principally a univalent aliphatic alcohol having a carbon chain of 1 to 4 carbon atoms.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein the carbon chain contains an ether group.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein the chlorosilane is silicon tetrachloride, trichlorosilane, iso-butyltrichlorosilane, 2-cyanoethyltrichlorosilane, 3-methacryloxypropyltrichlorosilane, dimethyldichlorosilane, vinylmethyldichlorosilane, and trimethylchlorosilane.
Claim 7
Dependent Claim
13 words
The method of claim 4 wherein the alcohol is methanol, ethanol or 2-methoxyethanol.
Claim 8
Dependent Claim
27 words
The method of claim 4 wherein the reaction temperature is 40°-80° C. and the mass transfer apparatus temperature is higher than the boiling temperature of the alcohol.
Claim 9
Dependent Claim
17 words
The method of claim 4 wherein inert solvent is used in place of an excess of alcohol.
Claim 10
Dependent Claim
35 words
The method of claim 1 wherein the chlorosilane and alcohol are introduced into the reactor at a constant ratio independent of the stoichiometric ratio of the reactants in the desired end monomeric or oligomeric alkoxysilanes.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein a stoichiometric amount of water corresponding to the desired oligomeric alkoxysilane is proportioned in liquid form into the reactor.
Claim 12
Dependent Claim
25 words
The method of claim 4 wherein a stoichiometric amount of water corresponding to the desired oligomeric alkoxysilane is proportioned in liquid form into the reactor.
Claim 13
Dependent Claim
12 words
The method of claim 2, wherein the terminal functional group is halogen.
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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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |