Patent US4218387A successfully refreshed from Google Patents.
US4218387A
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Preparation of catalytic copper and production of organochlorosilane using said copper
Assignee: Momentive Performance Materials GmbH
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Filing: 1978-10-19
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Granted: 1980-08-19
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Expires: 1998-10-19
Abstract
Abstract In the preparation of catalytic copper with an average particle size between about 0.1 and 100 microns and a copper-I oxide content of about 3 to 100% by oxidation of a Cu powder, the improvement which comprises carrying out the oxidation with oxygen at a reduced partial pressure compared with that of air, the resulting catalyst being of enhanced catalytic activity especially for the reaction of hydrocarbon chlorides with silicon for the production of organochlorosilanes (Rochow synthesis) wherein the desired material is produced in higher yield and greater selectivity.
Inventors
- 👤 Joachim Maas
- 👤 Rudolf Mundil
- 👤 Bruno Degen
- 👤 Hans-Heinrich Moretto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:55
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/16; B; B01; B01J; B01J23/00; B01J23/70; B01J23/72; B01J37/00; B01J37/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
In the preparation of catalytic copper with an average particle size between about 0.1 and 100 microns and a copper-I oxide content of about 3 to 100% by oxidation of a Cu powder, the improvement which comprises carrying out the oxidation with oxygen at a reduced partial pressure compared with that of air, the resulting catalyst being of enhanced catalytic activity.
Claim 2
Dependent Claim
61 words
In the preparation of catalytic copper with an average particle size between about 0.1 and 100 microns and a copper-I oxide content of about 3 to 100% by oxidation of a Cu powder, the improvement which comprises carrying out the oxidation with oxygen at a reduced partial pressure compared with that of air, the resulting catalyst being of enhanced catalytic activity.
Claim 3
Dependent Claim
39 words
A process according to claim 1, wherein the oxygen is mixed with further gases which are either inert or also have an oxidizing action, the oxygen content in the gas mixture being between about 0.1 and 15% by volume.
Claim 4
Dependent Claim
24 words
A process according to claim 1, wherein oxygen under a pressure of about 0.001 to 0.2 atmospheres absolute is used as the oxidizing agent.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein the oxidation is carried out at a temperature between about 100° to 1,000° C.
Claim 6
Dependent Claim
26 words
A process according to claim 1, wherein the residence time of the Cu powder in the oxidation zone is between about 2 seconds and 120 minutes.
Claim 7
Dependent Claim
9 words
Catalytic copper produced by the process of claim 1.
Claim 8
Dependent Claim
45 words
In the reaction of hydrocarbon chlorides with silicon in the presence of a copper catalyst to produce an organochlorosilane, the improvement which comprises employing as said catalyst catalytic copper produced by the process of claim 1, whereby the yield and selectivity of conversion are increased.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |