US4500724A
Expired / Lapsed
US
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Method for making alkylhalosilanes
Assignee: General Electric Co
•
Filing: 1983-07-28
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Granted: 1985-02-19
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Expires: 2003-07-28
Abstract
Abstract A method is provided for making alkylhalosilanes by effecting reaction between an alkyl halide, such as methyl chloride and powdered silicon in the presence of a copper-zinc-tin catalyst. Significant improvements in reaction rate and product selectivity are achieved when copper is employed at a critical weight percent relative to silicon and critical weight ratios of tin and zinc are employed relative to copper.
Inventors
- 👤 William J. Ward, III
- 👤 Alan Ritzer
- 👤 Kenneth M. Carroll
- 👤 John W. Flock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:44
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/835; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/16
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
26 words
A method for making alkylhalosilanes comprising effecting reaction between an alkyl halide and powdered silicon in the presence of an effective amount of a copper-zinc-tin catalyst.
Claim 2
Independent Claim
26 words
A method for making alkylhalosilanes comprising effecting reaction between an alkyl halide and powdered silicon in the presence of an effective amount of a copper-zinc-tin catalyst.
Claim 3
Dependent Claim
14 words
A method in accordance with claim 1, where the alkyl halide is methyl chloride.
Claim 4
Dependent Claim
18 words
A method in accordance with claim 1, which is practiced under continuous conditions in a fluid bed reactor.
Claim 5
Dependent Claim
15 words
A method in accordance with claim 1, which is practiced in a stirred bed reactor.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1, which is practiced in a fixed bed reactor.
Claim 7
Dependent Claim
14 words
A method in accordance with claim 1, which is operated in a batch mode.
Claim 8
Dependent Claim
19 words
A method in accordance with claim 1, which is practiced at a temperature in the range of 250°-350° C.
Claim 9
Dependent Claim
38 words
A method in accordance with claim 1, where the copper-zinc-tin catalyst comprises from 0.5-10% by weight of copper relative to silicon and 200-3000 ppm of tin and 0.01 part to 0.5 part of zinc, per part of copper.
Claim 10
Dependent Claim
23 words
A method in accordance with claim 1, where partially oxidized copper is used as the source of copper for the powdered copper-zinc-tin catalyst.
Claim 11
Dependent Claim
21 words
A method in accordance with claim 1, where cuprous chloride is used as the source of copper for the copper-zinc-tin catalyst.
Claim 12
Dependent Claim
21 words
A method in accordance with claim 1, where tin tetrachloride is used as the source of tin for the copper-zinc-tin catalyst.
Claim 13
Dependent Claim
17 words
A method in accordance with claim 1, using a contact mass of powdered silicon and copper-zinc-tin catalyst.
Claim 14
Dependent Claim
21 words
A method in accordance with claim 1, where zinc metal is used as the source of zinc for the copper-zinc-tin catalyst.
Claim 15
Dependent Claim
21 words
A method in accordance with claim 1, where zinc chloride is used as the source of zinc for the copper-zinc-tin catalyst.
Claim 16
Dependent Claim
21 words
A method in accordance with claim 1, where zinc oxide is used as the source of zinc for the copper-zinc-tin catalyst.
Claim 17
Dependent Claim
22 words
A method in accordance with claim 1, where tin metal dust is used as the source of tin for the copper-zinc-tin catalyst.
Claim 18
Dependent Claim
21 words
A method in accordance with claim 1, where tin oxide is used as the source of tin for the copper-zinc-tin catalyst.
Claim 19
Dependent Claim
21 words
A method in accordance with claim 1, where tetramethyl tin is used as the source of tin for the copper-zinc-tin catalyst.
Claim 20
Dependent Claim
23 words
A method in accordance with claim 1, where an alkylhalo tin compound is used as the source of tin for the copper-zinc-tin catalyst.
Claim 21
Dependent Claim
21 words
A method in accordance with claim 1, where copper formate is used as the source of copper for the copper-zinc-tin catalyst.
Claim 22
Independent Claim
176 words
A method for making methylchlorosilanes which substantially enhances the rate of dimethyldichlorosilane formation, while substantially reducing the weight ratio of methyltrichlorosilane to dimethyldichlorosilane, and maintaining or reducing the percent by weight of products in the resulting methylchlorosilane crude having a boiling point of greater than 70° C. at atmospheric pressure which comprises, effecting reaction between methyl chloride and powdered silicon in a reactor in the presence of an effective amount of a copper-zinc-tin catalyst produced by the introduction of a mixture of powdered silicon, copper, or copper compound, zinc or zinc compound, and tin or tin compound, where the copper or copper compound, tin or tin compound, and zinc or zinc compound are introduced along with powdered silicon and methyl chloride, and the introduction of copper, tin and zinc or compounds thereof is effected at a rate sufficient to maintain in the reactor, a copper-zinc-tin catalyst having an average composition of 0.5-10% by weight copper relative to silicon, 200-3,000 ppm tin relative to copper and 0.01 part to 0.5 part of zinc per part of copper.
Claim 23
Independent Claim
176 words
A method for making methylchlorosilanes which substantially enhances the rate of dimethyldichlorosilane formation, while substantially reducing the weight ratio of methyltrichlorosilane to dimethyldichlorosilane, and maintaining or reducing the percent by weight of products in the resulting methylchlorosilane crude having a boiling point of greater than 70° C. at atmospheric pressure which comprises, effecting reaction between methyl chloride and powdered silicon in a reactor in the presence of an effective amount of a copper-zinc-tin catalyst produced by the introduction of a mixture of powdered silicon, copper, or copper compound, zinc or zinc compound, and tin or tin compound, where the copper or copper compound, tin or tin compound, and zinc or zinc compound are introduced along with powdered silicon and methyl chloride, and the introduction of copper, tin and zinc or compounds thereof is effected at a rate sufficient to maintain in the reactor, a copper-zinc-tin catalyst having an average composition of 0.5-10% by weight copper relative to silicon, 200-3,000 ppm tin relative to copper and 0.01 part to 0.5 part of zinc per part of copper.
Claim 24
Dependent Claim
56 words
A method in accordance with claim 21, where the average composition of the copper-zinc-tin catalyst is maintained by conducting the reaction between methyl chloride and powdered silicon in a fluid bed reactor under continuous conditions and copper, zinc and tin or compounds thereof are continuously recycled as elutriated material along with powdered silicon to the reactor.
Claim 25
Dependent Claim
77 words
A method in accordance with claim 21, utilizing partially oxidized copper as the source of copper for the copper-zinc-tin catalyst, where the partially oxidized copper has less than 2000 ppm of tin based on the weight of copper which allows for the use of partially oxidized copper as the source of copper for the copper-zinc-tin catalyst having a level of tin exceeding the ppm range based on the weight of copper needed to maintain the copper-zinc-tin catalyst.
Claim 26
Dependent Claim
33 words
A powdered silicon-copper-zinc-tin contact mass comprising 0.5-10% by weight copper based on silicon, 200-3000 ppm of tin per part of copper and 0.01 part to 0.5 part of zinc per part of copper.
Claim 27
Dependent Claim
33 words
A powdered silicon-copper-zinc-tin contact mass comprising 0.5-10% by weight copper based on silicon, 200-3000 ppm of tin per part of copper and 0.01 part to 0.5 part of zinc per part of copper.
Claim 28
Dependent Claim
42 words
A method for making a contact mass of claim 24 comprising heating a mixture of powdered silicon cuprous chloride, tin and zinc or compounds thereof at a temperature in the range of from 280°-400° C. until the generation of silicon tetrachloride ceases.
Claim 29
Dependent Claim
17 words
A copper-zinc-tin catalyst useful for making methylchlorosilane based on the reaction between methyl chloride and powdered silicon.
Claim 30
Dependent Claim
17 words
A copper-zinc-tin catalyst useful for making methylchlorosilane based on the reaction between methyl chloride and powdered silicon.
Claim 31
Independent Claim
104 words
A method for making methylchlorosilanes which substantially enhances the rate of dimethyldichlorosilane formation while substantially reducing the weight ratio of methyltrichlorosilane to dimethyldichlorosilane and maintaining or reducing the percent by weight of products in the resulting methylchlorosilane crude having a boiling point of greater than 70° C. at atmospheric pressure, which comprises effecting reaction between methyl chloride and powdered silicon in the presence of an effective amount of a copper-zinc-tin catalyst where the copper-zinc-tin catalyst comprises from 0.5 to 10% by weight of copper relative to silicon and 200-3000 ppm of tin and 0.01 part to 0.5 part of zinc per part of copper.
Claim 32
Independent Claim
104 words
A method for making methylchlorosilanes which substantially enhances the rate of dimethyldichlorosilane formation while substantially reducing the weight ratio of methyltrichlorosilane to dimethyldichlorosilane and maintaining or reducing the percent by weight of products in the resulting methylchlorosilane crude having a boiling point of greater than 70° C. at atmospheric pressure, which comprises effecting reaction between methyl chloride and powdered silicon in the presence of an effective amount of a copper-zinc-tin catalyst where the copper-zinc-tin catalyst comprises from 0.5 to 10% by weight of copper relative to silicon and 200-3000 ppm of tin and 0.01 part to 0.5 part of zinc per part of copper.
Claim 33
Dependent Claim
22 words
A method in accordance with claim 27 where partially oxidized copper is used as a source of copper for the copper-zinc-tin catalyst.
References Cited (Backward Citations)
US2380996A
Cited
US2380997A
Cited
US2380995A
Cited
US2383818A
Cited
US2389931A
Cited
US2427605A
Cited
US2466412A
Cited
US2464033A
Cited
US2443902A
Cited
US2666776A
Cited
US2657114A
Cited
US2666775A
Cited
US2903473A
Cited
US2877254A
Cited
US2865939A
Cited
US2917529A
Cited
US2887502A
Cited
US3069452A
Cited
US3133109A
Cited
US3446829A
Cited
US3555064A
Cited
US4314908A
Cited
US4307242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |