US4314908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of reaction mass for the production of methylchlorosilane
Assignee: Elkem Metals Co LP
•
Filing: 1979-10-24
•
Granted: 1982-02-09
•
Expires: 1999-10-24
Abstract
Abstract A copper catalyzed silicon reaction mass for the production of methylchlorosilane which comprises free-flowing powders or particles of silicon metal having spots of a copper-silicon alloy substantially uniformly distributed on the surface of the silicon particles, the copper constituting less than about 2% and preferably about 1.75% by weight of the catalytic mass.
Inventors
- 👤 James H. Downing
- 👤 James E. Wells, III
- 👤 Tom K. Ioannou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:14
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/16
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
46 words
A copper-catalyzed silicon reaction mass for the production of methylchlorosilanes which comprises freeflowing particles of silicon metal having spots of a copper-silicon alloy substantially uniformly distributed on the surface of the silicon particles, the copper constituting less than about 2% by weight of the catalytic mass.
Claim 2
Dependent Claim
46 words
A copper-catalyzed silicon reaction mass for the production of methylchlorosilanes which comprises freeflowing particles of silicon metal having spots of a copper-silicon alloy substantially uniformly distributed on the surface of the silicon particles, the copper constituting less than about 2% by weight of the catalytic mass.
Claim 3
Independent Claim
103 words
A method for preparing a coppercatalyzed silicon reaction mass which comprises blending together finely-divided particles of silicon metal and a copper catalyst, the copper catalyst having a particle size in the range of between about 2 and 5 microns, and then heating the blended mixture in a reducing atmosphere at temperatures ranging from about 660° C. to about 1080° C. for a period of from about 5 hours at lower temperatures to about one-half hour at higher temperatures, the silicon and copper catalyst mixture containing sufficient copper catalyst to produce a copper concentration of less than about 2% by weight in the product.
Claim 4
Independent Claim
103 words
A method for preparing a coppercatalyzed silicon reaction mass which comprises blending together finely-divided particles of silicon metal and a copper catalyst, the copper catalyst having a particle size in the range of between about 2 and 5 microns, and then heating the blended mixture in a reducing atmosphere at temperatures ranging from about 660° C. to about 1080° C. for a period of from about 5 hours at lower temperatures to about one-half hour at higher temperatures, the silicon and copper catalyst mixture containing sufficient copper catalyst to produce a copper concentration of less than about 2% by weight in the product.
Claim 5
Dependent Claim
28 words
A method according to claim 2 wherein said copper catalyst mixture contains sufficient copper catalyst to produce a copper concentration of about 1.75% by weight in the product.
Claim 6
Dependent Claim
28 words
A method according to claim 2 wherein said silicon and copper catalyst mixture contains zinc powders in a weight ratio of total copper to zinc of about 10/1.
Claim 7
Dependent Claim
27 words
A method according to claim 2 wherein said copper catalyst contains arsenic, antimony, bismuth and lead in a total concentration of less than about 0.1% by weight.
Claim 8
Dependent Claim
15 words
A method according to claim 2 wherein said copper catalyst is essentially pure copper metal.
Claim 9
Dependent Claim
14 words
A method according to claim 2 wherein said copper catalyst is Cu 2 O.
Claim 10
Dependent Claim
12 words
A method according to claim 2 wherein said copper catalyst is CuO.
Claim 11
Dependent Claim
16 words
A method according to claim 2 wherein said copper catalyst is uniformly oxidized Cu/Cu 2 O/CuO.
Claim 12
Dependent Claim
12 words
A method according to claim 2 wherein said reducing atmosphere is hydrogen.
Claim 13
Dependent Claim
23 words
A method according to claim 10 wherein the hydrogen stoichiometry is maintained in the range of between about 5 and 20 to 1.
Claim 14
Dependent Claim
41 words
A method according to claim 2 wherein said finely-divided particles of silicon metal and copper catalyst are blended together in a rotary calciner and wherein a reducing gas is passed countercurrently to the flow of said particles through said rotary calciner.
Claim 15
Dependent Claim
12 words
A method according to claim 12 wherein said reducing gas is hydrogen.
Claim 16
Dependent Claim
23 words
A method according to claim 13 wherein the hydrogen stoichiometry is maintained in the range of between about 5 and 200 to 1.
Claim 17
Dependent Claim
27 words
A method according to claim 13 wherein said hydrogen gas flows through said rotary calciner at a velocity of between about 0.04 and 0.13 feet per second.
Claim 18
Independent Claim
103 words
A method for preparing a copper-catalyzed silicon reaction mass which comprises blending together finely-divided particles of silicon metal, a copper catalyst and zinc powders, the copper catalyst having a particle size in the range of between 2 and 5 microns, and passing the blended mixture through a rotary calciner while continuously contacting the blended mixture with a countercurrent flow of hydrogen gas at a temperature of about 1000° C. for a period of at least about one-half hour, the silicon and copper catalyst mixture containing sufficient copper catalyst to produce a copper concentration of less than about 2% by weight in the product.
Claim 19
Independent Claim
103 words
A method for preparing a copper-catalyzed silicon reaction mass which comprises blending together finely-divided particles of silicon metal, a copper catalyst and zinc powders, the copper catalyst having a particle size in the range of between 2 and 5 microns, and passing the blended mixture through a rotary calciner while continuously contacting the blended mixture with a countercurrent flow of hydrogen gas at a temperature of about 1000° C. for a period of at least about one-half hour, the silicon and copper catalyst mixture containing sufficient copper catalyst to produce a copper concentration of less than about 2% by weight in the product.
Claim 20
Dependent Claim
23 words
A method according to claim 16 wherein the hydrogen stoichiometry is maintained in the range of between about 5 and 200 to 1.
References Cited (Backward Citations)
US2380996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |