US3626705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature separation of gaseous mixtures employing solidification
Assignee: Messer Griesheim GmbH
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Filing: 1968-09-04
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Granted: 1971-12-14
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Expires: 1988-09-04
Abstract
Abstract A PROCESS FOR RECOVERING HYDROGEN FROM A REFINERY OFF GAS BY PROGRESSIVE REDUCTION IN TEMPERATURE OF THE GAS AND SUCCESSIVE REMOVAL OF RESPECTIVE CONTAMINANTS THEREFROM BY CONDENSATION THEREOF. AT LEAST SOME OF THE CONDENSED CONTAMINANTS ARE EXPANDED AND EMPLOYED AS A REFRIGERATING FLUID IN THE PROCESS. METHANE WHICH PRECIPITATES OUT AS SOLID IN THE FINAL STAGE OF HEAT EXCHANGE IS REMOVED IN AN ALTERNATING EXCHANGER PURGE ARRANGEMENT. IN A HYDROGEN PURIFICATON SYSTEM, A PORTION OF THE PURIFIED HYDROGEN ISMIXED WITH THE CONDENSED HYDROCARBONS SEPARATED FROM THE CRUDE HYDROGEN AND THIS MIXTURE IS USED TO COOL THE CRUDE HYDROGEN TO BE PURIFIED.
Inventors
- 👤 Helmut Knapp
- 👤 Irving Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:15
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/06; F25J3/063; F25J3/0635; F25J3/0605; F25J3/062; F25J3/064; F25J3/0655; F25J2205/00; F25J2205/20; F25J2210/00; F25J2210/12; F25J2270/00; F25J2270/12; F25J2270/42; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/932
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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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |