US4284528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic CO2 acceptor
Assignee: Consolidation Coal Co
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Filing: 1980-02-25
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Granted: 1981-08-18
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Expires: 2000-02-25
Abstract
Abstract A synthetic CO 2 acceptor consisting essentially of at least one compound selected from the group consisting of calcium oxide and calcium carbonate supported in a refractory carrier matrix, the carrier having the general formula Ca 5 (SiO 4 ) 2 CO 3 . A method for producing the synthetic CO 2 acceptor is also disclosed.
Inventors
- 👤 Michael S. Lancet
- 👤 George P. Curran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:46
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/54; C10J3/56; C10J3/72; C10J3/78; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/0916; C10J2300/092; C10J2300/0953; C10J2300/0956; C10J2300/0973; C10J2300/0976; C10J2300/0983; C10J2300/0996; C10J2300/18; C10J2300/1807; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A synthetic CO 2 acceptor consisting essentially of at least one calcium compound selected from the group consisting of calcium oxide and calcium carbonate supported in a refractory carrier matrix, said carrier having the general formula Ca 5 (SiO 4 ) 2 CO 3 , wherein said calcium compound is present in an amount up to about 50 weight percent, calculated as calcium oxide, based on the weight of the acceptor.
Claim 2
Dependent Claim
71 words
A synthetic CO 2 acceptor consisting essentially of at least one calcium compound selected from the group consisting of calcium oxide and calcium carbonate supported in a refractory carrier matrix, said carrier having the general formula Ca 5 (SiO 4 ) 2 CO 3 , wherein said calcium compound is present in an amount up to about 50 weight percent, calculated as calcium oxide, based on the weight of the acceptor.
Claim 3
Independent Claim
121 words
A method for producing a synthetic CO 2 acceptor, said acceptor comprising a mixture of calcium carbonate and spurrite, Ca 5 (SiO 4 ) 2 CO 3 said method consisting essentially of: (a) mixing calcium carbonate, silica and water to produce a pelletizable mixture containing from about 85 to about 90 weight percent calcium carbonate and from about 10 to about 15 weight percent silica; (b) pelletizing said mixture to produce particles of a desired size; and (c) heating said particles to a temperature of at least 1500° F. for at least 30 minutes at a steam pressure of at least about 18 atmospheres and a carbon dioxide pressure of at least 2 atmospheres to produce said synthetic CO 2 acceptor.
Claim 4
Independent Claim
121 words
A method for producing a synthetic CO 2 acceptor, said acceptor comprising a mixture of calcium carbonate and spurrite, Ca 5 (SiO 4 ) 2 CO 3 said method consisting essentially of: (a) mixing calcium carbonate, silica and water to produce a pelletizable mixture containing from about 85 to about 90 weight percent calcium carbonate and from about 10 to about 15 weight percent silica; (b) pelletizing said mixture to produce particles of a desired size; and (c) heating said particles to a temperature of at least 1500° F. for at least 30 minutes at a steam pressure of at least about 18 atmospheres and a carbon dioxide pressure of at least 2 atmospheres to produce said synthetic CO 2 acceptor.
Claim 5
Dependent Claim
48 words
The method of claim 2 wherein said pellets are heated to a temperature of at least about 1600° F. at a carbon dioxide pressure of at least one atmosphere prior to the heating step of (c) to partially harden said particles prior to the heating of step (c).
Claim 6
Dependent Claim
18 words
The method of claim 2 wherein said carbon dioxide pressure is from about 2 to about 3 atmospheres.
Claim 7
Dependent Claim
53 words
The method of claim 2 wherein said synthetic CO 2 acceptor of step (c) is further heated in the presence of finely divided silica at a temperature from about 1450° to about 1600° F. at a carbon dioxide pressure of at least 2 atmospheres to further harden said synthetic CO 2 acceptor particles.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |