EP0421644A2
Expired / Lapsed
EP
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Method for preparation of organoalkoxysilanes
Assignee: Dow Silicones Corp
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Filing: 1990-09-21
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Granted: —
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Expires: 2010-09-21
Abstract
Abstract Disclosed is a one reactor, continuous system for the manufacture of organoalkoxysilanes. The reactor consists of a fractionating means that allows for completion of the reaction and separation of the HCl formed as a by-product. Also disclosed is a means for removing or reducing any residual hydrolyzable chloride or other acids in the organoalkoxysilanes using ion exchange resins.
Inventors
- 👤 Howard Marvin Bank
- 👤 Robert Allan Petrisko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A process for making organoalkoxysilanes using fractionation means consisting essentially of (i) a column comprised of contacting devices (ii) means for providing heat to and partially containing the contents at a sump portion and (iii) means for providing cooling to the contents at a head of the column; wherein the process comprises A) feeding simultaneously into the column a) organochlorosilane, b) liquid alcohol and c) vaporized alcohol, such that the alcohol contacts the organochlorosilane; B) maintaining a temperature within said column such that at least the lower 1/3 of the column is above the boiling point of the alcohol and no reflux of alcohol is present in the head of the column; C) recovering any organoalkoxysilane formed from the sump portion of the column; and D) recovering HCl at the head of the column.
Claim 2
Dependent Claim
134 words
A process for making organoalkoxysilanes using fractionation means consisting essentially of (i) a column comprised of contacting devices (ii) means for providing heat to and partially containing the contents at a sump portion and (iii) means for providing cooling to the contents at a head of the column; wherein the process comprises A) feeding simultaneously into the column a) organochlorosilane, b) liquid alcohol and c) vaporized alcohol, such that the alcohol contacts the organochlorosilane; B) maintaining a temperature within said column such that at least the lower 1/3 of the column is above the boiling point of the alcohol and no reflux of alcohol is present in the head of the column; C) recovering any organoalkoxysilane formed from the sump portion of the column; and D) recovering HCl at the head of the column.
Claim 3
Dependent Claim
36 words
A process as claimed in claim 1 wherein a reboiler is used as the means to provide heat and the temperature of the reboiler contents is maintained between 70 to 115°C. while operating under atmospheric pressure.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 1 where the organochlorosilane is distilled prior to its introduction into the column.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 1 wherein additionally the organoalkoxysilanes prepared are contacted with an ion exchange resin that is free of hydroxylic materials to remove any acid.
References Cited (Backward Citations)
No citation records indexed.
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