US3628340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cryogenic purification of hydrogen
Assignee: HRI Inc
•
Filing: 1969-11-13
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Granted: 1971-12-21
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Expires: 1989-11-13
Abstract
Abstract A process for separating condensable contaminants such as methane from a crude hydrogen stream utilizing a series of multipass heat exchangers through which the gas flows for stepwise cooling, with interstage separation of condensates which are expanded and passed in a reverse flow path for autogenous refrigeration. Supplemental refrigeration is provided for the last cooling stage to maintain the plant in proper heat balance for variations in feed gas composition and to facilitate startup.
Inventors
- 👤 Joseph Meisler
- 👤 Edward Harold Van Baush
- 👤 Gregory Christ Banikiotes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:56
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; F; F25; F25J; F25J3/00; F25J3/06; F25J3/0605; F25J3/062; F25J3/063; F25J3/0635; F25J3/064; F25J3/0655; C01B2203/00; C01B2203/04; C01B2203/046; C01B2203/0465; C01B2203/048; C01B2203/0495; F25J2205/00; F25J2205/40; F25J2205/60; F25J2210/00; F25J2210/12; F25J2220/00; F25J2220/60; F25J2270/00; F25J2270/90; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/932
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
The process of claim 1 wherein the partially cooled gas stream from step (b) is further cooled to about at least as low as -30* F. by a first external heat exchange means.
References Cited (Backward Citations)
US1913805A
Cited
US3119677A
Cited
US3224211A
Cited
US3363428A
Cited
US3359744A
Cited
US3543529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |