US3885927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing carbon dioxide from gas streams
Assignee: Union Carbide Corp
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Filing: 1974-02-05
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Granted: 1975-05-27
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Expires: 1994-02-05
Abstract
Abstract A more efficient removal by selective adsorption of carbon dioxide from nitrogen-containing gas streams is achieved by using as the adsorbent a Type X zeolitic molecular sieve containing at least 90 equivalent per cent barium cations.
Inventors
- 👤 John Delano Sherman
- 👤 Ronald Jay Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
PROCESS FOR REMOVING CARBON DIOXIDE FROM GAS STREAMS WHICH COMPRISES PROVIDING A GAS STREAM COMPRISING NITROGEN AND CARBON DIOXIDE, SAID GAS STREAM CONTAINING NOT MORE THAN ABOUT 1000 PPM BT VOLUME OF CARBON DIOXIDE, PASSING SAID GAS STREAM THROUGH AN ADSORPTION ZONE AT A TEMPERATURE OF FROM -40*F TO + 120*F AT A PRESSURE OF FROM ABOUT 6 TO 170 ATMOSPHERES AND AT A FEED RATE OF FROM 5000 TO 5,000,000 STANDARD CUBIC FEET PER HOUR, SAID ADSORPTION ZONE CONTAINING THE BARIUM CATION FORM OF ZEOLITE X IN WHICH THE BAO/AL2O3 MOLAR RATION IS AT LEAST 0.90, WHEREBY THE CARBON DIOXIDE IS SELECTIVELY ADSORBED AND THE EFFLUENT FROM THE ADSORPTION ZONE IS SUBSTANTIALLY FREE OF CARBON DIOXIDE.
Claim 2
Dependent Claim
117 words
PROCESS FOR REMOVING CARBON DIOXIDE FROM GAS STREAMS WHICH COMPRISES PROVIDING A GAS STREAM COMPRISING NITROGEN AND CARBON DIOXIDE, SAID GAS STREAM CONTAINING NOT MORE THAN ABOUT 1000 PPM BT VOLUME OF CARBON DIOXIDE, PASSING SAID GAS STREAM THROUGH AN ADSORPTION ZONE AT A TEMPERATURE OF FROM -40*F TO + 120*F AT A PRESSURE OF FROM ABOUT 6 TO 170 ATMOSPHERES AND AT A FEED RATE OF FROM 5000 TO 5,000,000 STANDARD CUBIC FEET PER HOUR, SAID ADSORPTION ZONE CONTAINING THE BARIUM CATION FORM OF ZEOLITE X IN WHICH THE BAO/AL2O3 MOLAR RATION IS AT LEAST 0.90, WHEREBY THE CARBON DIOXIDE IS SELECTIVELY ADSORBED AND THE EFFLUENT FROM THE ADSORPTION ZONE IS SUBSTANTIALLY FREE OF CARBON DIOXIDE.
Claim 3
Dependent Claim
13 words
Process according to claim 1 wherein the gas stream being treated is air.
Claim 4
Dependent Claim
22 words
Process according to claim 2 wherein the barium cation form of zeolite X has a molar BaO/Al2O3 ratio of at least 0.95.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |