US4950312A
Expired / Lapsed
US
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Silica-bound calcium-containing zeolite a granulate
Assignee: Bayer AG
•
Filing: 1988-05-11
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Granted: 1990-08-21
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Expires: 2008-05-11
Abstract
Abstract A SiO2-bound, substantially carbonate-free, calcium-containing zeolite A granulate in which the calcium content is 0.4 to 1 mole CaO/mole Al2O3 and a process for the production such SiO2-bound calcium exchanged zeolite A granulate in a CO2-free atmosphere at temperatures of 350 DEG C. to 700 DEG C. The SiO2-bound zeolite granulate A being useful as an adsorbent in the recovery of oxygen by the pressure change adsorption process.
Inventors
- 👤 Lothar Puppe
- 👤 Gerhard Reiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:19
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/14; B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2253/30; B01D2253/302; B01D2253/306; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2259/00; B01D2259/40; B01D2259/403; B01D53/04; B01D53/0407; B01D53/0446; B01D53/047; Y; Y10; Y10S; Y10S423/00; Y10S423/24; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A SiO 2 -bound, substantially carbonate-free activated, calcium-containing zeolite A granulate in which the calcium content of the zeolite A is 0.4 to 1 mole CaO/mole Al 2 O 3 .
Claim 2
Dependent Claim
31 words
A SiO 2 -bound, substantially carbonate-free activated, calcium-containing zeolite A granulate in which the calcium content of the zeolite A is 0.4 to 1 mole CaO/mole Al 2 O 3 .
Claim 3
Dependent Claim
24 words
A SiO 2 -bound zeolite according to claim 1, wherein the calcium content is more than 0.5 mole CaO/mole Al 2 O 3 .
Claim 4
Dependent Claim
40 words
A process for the production of the SiO 2 -bound zeolite granulate A according to claim 1, comprising activating a SiO 2 -bound, calcium-exchanged zeolite A in a CO 2 -free atmosphere at temperatures of 350° C. to 700° C.
Claim 5
Dependent Claim
15 words
A process according to claim 3, wherein the temperature is 400° C. to 700° C.
Claim 6
Dependent Claim
30 words
In the recovery of oxygen by the pressure change adsorption process, wherein the improvement comprises using a SiO 2 -bound zeolite A granulate according to claim 1 as the absorbent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |