Patent US3643452A successfully refreshed from Google Patents.
US3643452A
Expired / Lapsed
US
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Recovery of gases
Assignee: Costain Petrocarbon Ltd
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Filing: 1969-08-20
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Granted: 1972-02-22
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Expires: 1989-08-20
Abstract
Abstract A light gas, namely hydrogen or helium, of increased purity is obtained from a gaseous mixture consisting predominantly of the light gas by passing the mixture through a rotating gas centrifuge under conditions such that gaseous impurities are condensed and a light gas stream of increased purity is recovered. The process may be applied to a light gas concentrate obtained from a gaseous mixture by separation of the constituents other than the light gas by low-temperature condensation, in which case a gas expansion turbine used to produce refrigeration for the process may be used to drive the gas centrifuge.
Inventors
- 👤 Martin Siegfried Will Ruhemann
- 👤 Stanley Mercer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:05
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/06; F25J3/0605; F25J3/062; B; B01; B01D; B01D45/00; B01D45/12; B01D45/14; F25J3/063; F25J3/0655; F25J3/066; F25J3/0685; F25J3/069; F25J2200/00; F25J2200/80; F25J2205/00; F25J2205/10; F25J2205/40; F25J2210/00; F25J2210/20; F25J2240/00; F25J2240/02; Y; Y10; Y10S; Y10S494/00; Y10S494/90; Y10S62/00; Y10S62/902; Y10S62/91; Y10S62/927; Y10S62/931; Y10S62/933
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
A process according to claim 1, wherein the gaseous mixture introduced into the gas centrifuge contains from 90 to 98 percent by volume of said gas.
Claim 2
Dependent Claim
13 words
A process according to claim 2, wherein the said gaseous mixture contains nitrogen.
Claim 3
Dependent Claim
36 words
A process according to claim 2, wherein the said gaseous mixture is introduced into the gas centrifuge at a temperature of from 64 to 110* K. and a pressure of from 10 to 50 atmospheres absolute.
Claim 4
Dependent Claim
39 words
A process according to claim 1 wherein the said gaseous mixture is obtained from another gaseous mixture containing a lesser proportion of said gas by the separation of constituents other than said gas by low-temperature condensation in known manner.
Claim 5
Dependent Claim
15 words
A process according to claim 5, wherein said another gaseous mixture contains nitrogen and methane.
Claim 6
Dependent Claim
48 words
A process according to claim 5, wherein a gas expansion turbine is used to produce refrigeration for the process, the gas centrifuge is driven by the expansion turbine and the gas stream recovered from the gas centrifuge is expanded through the expansion turbine to produce the refrigeration required.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1 wherein the gas stream recovered from the gas centrifuge is further purified by being subjected to an adsorption process.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1 wherein the gas stream recovered from the gas centrifuge is further purified by being subjected to a diffusion process.
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |