US3839847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic hydrogen adsorption system
Assignee: HRI Inc
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Filing: 1972-07-05
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Granted: 1974-10-08
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Expires: 1992-07-05
Abstract
Abstract High purity, 97 to 99.9 percent, hydrogen is obtained through a separation process comprising a low temperature refrigeration system operating below 120*R, and an adsorption system operating on the adiabatic pressure-swing principle within the temperature range of 260* to 140*R. The adsorption system contains particulate material in admixture with the adsorbent medium. The material provides sufficient heat capacity within the adsorption system to minimize any temperature fluctuations in the adsorption bed between the adsorption period and the desorption period.
Inventors
- 👤 G Banikiotes
- 👤 Baush E Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:40
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/108; B01D2253/1085; B01D2256/00; B01D2256/16; B01D2259/00; B01D2259/40; B01D2259/404; B01D2259/416; B01D53/047; C01B2203/00; C01B2203/04; C01B2203/046; C01B2203/0465; C01B2203/047; C01B2203/048
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
AN IMPROVED PROCESS FOR THE CRYCOGENIC ADSORPTION PURIFICATION OF HYDROGEN TO OBTAIN A PRODUCT OF 97 TO 99.9 PERCENT HYDROGEN WHEREIN PURIFIED HYDROGEN IS FED TO AN ADSORPTION SYSTEM WHICH IS OPERATED AT A TEMPERATURE BETWEEN ABOUT 140*R AND 260*R, AT A PRESSURE BETWEEN 20 AND 900 PSIA AND SUCH THAT THE ADSORPTION, DEPRESSURIZATION, DESORPTION AND PRESSURIZATION STEPS ARE CARRIED OUT TO MINIMIZE PRESSURE FLUCTUATIONS THROUGHOUT THE PROCESS WHEREIN THE IMPROVEMENT COMPRISES THE ADDITION OF PARTICULATE MATERIAL HAVING A HIGH HEAT CAPACITY AND A HIGH THERMAL CONDUCTIVITY SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, STEEL, IRON AND QUARTZ, TO THE ADSORPTION MEDIUM FORMING AN ADMIXTURE THEREOF TO THEREBY MINIMIZE TEMPERATURE FLUCTUATIONS DURING THE OPERATION OF THE ADSORPTION SYSTEM.
Claim 2
Dependent Claim
118 words
AN IMPROVED PROCESS FOR THE CRYCOGENIC ADSORPTION PURIFICATION OF HYDROGEN TO OBTAIN A PRODUCT OF 97 TO 99.9 PERCENT HYDROGEN WHEREIN PURIFIED HYDROGEN IS FED TO AN ADSORPTION SYSTEM WHICH IS OPERATED AT A TEMPERATURE BETWEEN ABOUT 140*R AND 260*R, AT A PRESSURE BETWEEN 20 AND 900 PSIA AND SUCH THAT THE ADSORPTION, DEPRESSURIZATION, DESORPTION AND PRESSURIZATION STEPS ARE CARRIED OUT TO MINIMIZE PRESSURE FLUCTUATIONS THROUGHOUT THE PROCESS WHEREIN THE IMPROVEMENT COMPRISES THE ADDITION OF PARTICULATE MATERIAL HAVING A HIGH HEAT CAPACITY AND A HIGH THERMAL CONDUCTIVITY SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, STEEL, IRON AND QUARTZ, TO THE ADSORPTION MEDIUM FORMING AN ADMIXTURE THEREOF TO THEREBY MINIMIZE TEMPERATURE FLUCTUATIONS DURING THE OPERATION OF THE ADSORPTION SYSTEM.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the adsorption medium is silica gel and the particulate material is aluminum in a ratio of 1:1.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the temperature fluctuation within the adsorption system is maintained between 5* and 10*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |