US4554141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas stream purification
Assignee: SunEdison Inc
•
Filing: 1984-05-14
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Granted: 1985-11-19
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Expires: 2004-05-14
Abstract
Abstract A process for the removal of ethylene from silane. Hydrocarbon-contaminated silane is preferably first distilled in a conventional distillation column to remove hydrocarbons boiling higher and lower than silane. Ethylene is removed by passing the silane stream through a column of zeolite, preferably zeolite A having a 4 Angstrom micropore. The 4 Angstrom zeolite A has a high capacity for ethylene and is readily regenerated.
Inventors
- 👤 Herbert M. Scull
- 👤 Sebastian M. Laurent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:59
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/04; C01B33/046; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
32 words
A process for the purification of silane, said process comprising contacting silane contaminated with ethylene with a zeolite which has a pore structure that selectively removes ethylene and recovering the purified silane.
Claim 2
Dependent Claim
32 words
A process for the purification of silane, said process comprising contacting silane contaminated with ethylene with a zeolite which has a pore structure that selectively removes ethylene and recovering the purified silane.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said silane contains about 1-10 ppm ethylene and the silane is contacted with a zeolite so as to lower the ethylene to less than 25 ppb.
Claim 4
Dependent Claim
27 words
The process of claim 1 comprising passing silane contaminated with ethylene through a zeolite A having a micropore of about 4 Angstroms and recovering the purified silane.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein said zeolite A is of the sodium cation form.
Claim 6
Dependent Claim
23 words
The process of claim 3 wherein about one part or less by weight zeolite A is used per 40 parts by weight silane.
Claim 7
Dependent Claim
23 words
The process of claim 3 wherein said silane contains at least about 25 parts by weight ethylene per billion parts by weight silane.
Claim 8
Dependent Claim
15 words
The process of claim 3 wherein said silane contaminated with ethylene also contains another hydrocarbon.
Claim 9
Dependent Claim
12 words
The process of claim 7 wherein said hydrocarbon is methane or ethane.
Claim 10
Dependent Claim
18 words
The process of claim 3 wherein said process is carried out in a column of said zeolite A.
Claim 11
Dependent Claim
17 words
The process of claim 3 wherein said zeolite A is in the form of small diameter extrudate.
Claim 12
Dependent Claim
25 words
The process of claim 3 wherein the ethylene contaminant is present in the silane at the level of up to about 10 ppm by weight.
Claim 13
Dependent Claim
18 words
The process of claim 1 wherein the process is carried out at a temperature below about 30° C.
Claim 14
Dependent Claim
55 words
A process for the removal of hydrocarbon contaminants from silane said process comprising the steps of: (a) distilling silane contaminated with hydrocarbon contaminants including ethylene so as to remove hydrocarbons other than ethylene; (b) passing the distilled silane through a zeolite having a pore structure that selectively removes ethylene; and (c) recovering the purified silane.
Claim 15
Dependent Claim
55 words
A process for the removal of hydrocarbon contaminants from silane said process comprising the steps of: (a) distilling silane contaminated with hydrocarbon contaminants including ethylene so as to remove hydrocarbons other than ethylene; (b) passing the distilled silane through a zeolite having a pore structure that selectively removes ethylene; and (c) recovering the purified silane.
Claim 16
Dependent Claim
13 words
The process of claim 13 wherein said hydrocarbon contaminants include methane or ethane.
Claim 17
Dependent Claim
20 words
The process of claim 13 wherein said zeolite is a zeolite A having a micropore structure of about 4 Angstroms.
Claim 18
Dependent Claim
15 words
The process of claim 15 wherein said zeolite A is a sodium cation zeolite A.
Claim 19
Dependent Claim
23 words
The process of claim 15 wherein at least one part by weight zeolite A is used per 40 parts by weight distilled silane.
Claim 20
Dependent Claim
17 words
The process of claim 15 wherein said zeolite A is in the form of small diameter extrudate.
Claim 21
Dependent Claim
18 words
The process of claim 13 wherein said process is carried out at a temperature below about 30° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |