US4032557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing organosiloxanes
Assignee: Wacker Chemie AG
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Filing: 1976-04-26
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Granted: 1977-06-28
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Expires: 1996-04-26
Abstract
Abstract An improved process for preparing organosiloxanes and alkyl halides by passing organohalosilanes and alkanols having 1 and/or 2 carbon atoms through at least one layer of packing material which is maintained at a temperature of from 60° to 150° C, the improvement which comprises (1) recycling from 1 to 6 liters of an aqueous phase separated from the organosiloxanes emerging from the layer or layers of packing material for each mol of organohalosilane introduced into the layer or layers of packing material and (2) reacting the organosiloxane separated from the aqueous phase with from 2 to 10 percent by weight based on the weight of the organosiloxane with the same organohalosilane which is passed through the layer or layers of packing material.
Inventors
- 👤 Helmut Spork
- 👤 Rudolf Strasser
- 👤 Rudolf Riedle
- 👤 Wolfgang Jacques
- 👤 Johann Waas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:27
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C07; C07C; C07C17/00; C07C17/093; C07C17/16; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874; C07F7/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
An improved process for preparing organosiloxanes and alkyl halides by introducing an organohalosilane and alkanol having from 1 to 2 carbon atoms into a reactor containing at least one layer of packing material which is maintained at a temperature of from 60° to 150° C. to form an aqueous phase containing organosiloxanes, and thereafter separating the organosiloxanes from the aqueous phase, the improvement which comprises (1) recycling into the reactor from 1 to 6 liters of the aqueous phase for each mol of the organohalosilane introduced into the reactor and (2) reacting the organosiloxanes separated from the aqueous phase with from 2 to 10 percent by weight based on the weight of the organosiloxanes with the same organohalosilane used in the initial reaction.
Claim 2
Dependent Claim
123 words
An improved process for preparing organosiloxanes and alkyl halides by introducing an organohalosilane and alkanol having from 1 to 2 carbon atoms into a reactor containing at least one layer of packing material which is maintained at a temperature of from 60° to 150° C. to form an aqueous phase containing organosiloxanes, and thereafter separating the organosiloxanes from the aqueous phase, the improvement which comprises (1) recycling into the reactor from 1 to 6 liters of the aqueous phase for each mol of the organohalosilane introduced into the reactor and (2) reacting the organosiloxanes separated from the aqueous phase with from 2 to 10 percent by weight based on the weight of the organosiloxanes with the same organohalosilane used in the initial reaction.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein from 1 to 1.75 mols of alkanol for each gram-atom of halogen is added to the reactor in addition to the alkanol present in the recycled aqueous phase.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the reactor contains from 7 to 50 percent by weight of alkanol based on the total weight of alkanol, water and hydrogen halide.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the alkanol is generated in in-situ by the hydrolysis of carboxylic acid esters having from 2 to 4 carbon atoms.
Claim 6
Dependent Claim
69 words
The process of claim 1 wherein the organohalosilane is represented by the formula R.sub.m H.sub.n SiX.sub.4.sub.-m.sub.-n in which R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals having from 1 to 6 carbon atoms, X is a halogen, m is a number of from 1 to 3, n is 0 to 1 and the sum of m+ n is 2 or 3.
Claim 7
Dependent Claim
90 words
The process of claim 1 wherein the organosilane is represented by the formula XSi(R.sub.2)R'Si(R.sub.2)X in which R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals having from 1 to 6 carbon atoms, R' is selected from the group consisting of divalent hydrocarbon radicals and substituted divalent hydrocarbon radicals having from 1 to 6 carbon atoms, X is a halogen, m is a number of from 1 to 3, n is 0 to 1 and the sum of m+ n is 2 or 3.
References Cited (Backward Citations)
US3803195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |