US3903010A
Expired / Lapsed
US
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Preparation of oxygen acceptor compositions and oxygen production process
Assignee: Consolidated Natural Gas Service Co Inc
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Filing: 1972-08-03
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Granted: 1975-09-02
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Expires: 1992-08-03
Abstract
Abstract Process of preparing special oxygen acceptor compositions for the production of oxygen in modified Brin-type processes. The preparation process comprises forming a physical mixture of finely ground barium carbonate and a composition or compound containing Mg and Ca carbonates, e.g., dolomite, in predetermined proportions, and heating them under an inert gas, such as nitrogen, or in a vacuum to convert the barium carbonate to barium monoxide and the dolomite dolomitic quicklime. Thereafter, the composition is heated in a dry, CO2-free atmosphere of air or oxygen to convert the barium monoxide to barium peroxide to form the final composition of barium peroxide-dolomitic quicklime. Pellets, powders, granules and coatings of the material may be formed. The mixture may be pelletized before or after either conversion step. Other decomposable compounds of magnesium and calcium may be used in place of the preferred dolomite. The end product compositions should have a carbon dioxide level such that the CO2/BaO2 mole ratio in the mixture is less than 1.0. Modified Brin-type processes employing pellets of this composition show improved oxidation and reduction rates and SORT conversion values for times in excess of typical static bed cycle time or fluidized bed residence time.
Inventors
- 👤 Lester G Massey
- 👤 Paul B Tarman
- 👤 Dharamvir Punwani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/08; C01B13/086; C01B13/083
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
187 words
A PROCESS FOR PRODUCTION OF OXYGEN ACCEPTOR COMPOSITIONS CONTAINING A BARIUM OXIDE, USEFUL IN THE PRODUCTION OF OXYGEN BY REVERSIBLE ACCEPTANCE AND STRIPPING OF OXYGEN FROM SAID BARIUM OXIDE UNDER CONTROLLED PRESSURE AND TEMPERATURE CONDITIONS, COMPRISING THE STEPS OF: A. MIXING BACO3 WITH MGCO3 AND CACO3 TO FORM A RAW COMPOSITION, SAID BACO3 BEING PRESENT IN SAID RAW COMPOSITION IN AN AMOUNT SUFFICIENT TO GIVE A FINAL AMOUNT OF BARIUM OXIDE, CALCULATED AS BAO2 IN SAID OXYGEN ACCEPTOR COMPOSITIONS IN THE RANGE OF FROM ABOUT 8 TO 70 WEIGHT %, B. HEATING SAID RAW COMPOSITION IN AN INERT ATMOSPHERE OR VACUUM TO EVOLVE CO2 FROM SAID RAW COMPOSITION AND TO CONVERT SAID BACO3 TO BAO AND TO PROVIDE A MOLE RATIO OF CO2 TO BAO2 IN THE RESULTANT PARTIALLY CONVERTED COMPOSITION OF LESS THAN 1.0, AND C. REACTING THE PARTIALLY CONVERTED COMPOSITION WITH OXYGEN AT AN ELEVATED TEMPERATURE AND COOLING SAID PARTIALLY CONVERTED COMPOSITION TO AMBIENT TEMPERATURE IN A SUBSTANTIALLY DRY,CO2-FREE OXYGEN-CONTAINING ATMOSPHERE HAVING A PARTIAL PRESSURE OF OXYGEN OF ABOVE ABOUT 0.2 ATMOSPHERES TO FORM SAID OXYGEN ACCEPTOR COMPOSITION PRODUCT HAVING BAO2, MGO AND CAO THEREIN.
Claim 2
Dependent Claim
187 words
A PROCESS FOR PRODUCTION OF OXYGEN ACCEPTOR COMPOSITIONS CONTAINING A BARIUM OXIDE, USEFUL IN THE PRODUCTION OF OXYGEN BY REVERSIBLE ACCEPTANCE AND STRIPPING OF OXYGEN FROM SAID BARIUM OXIDE UNDER CONTROLLED PRESSURE AND TEMPERATURE CONDITIONS, COMPRISING THE STEPS OF: A. MIXING BACO3 WITH MGCO3 AND CACO3 TO FORM A RAW COMPOSITION, SAID BACO3 BEING PRESENT IN SAID RAW COMPOSITION IN AN AMOUNT SUFFICIENT TO GIVE A FINAL AMOUNT OF BARIUM OXIDE, CALCULATED AS BAO2 IN SAID OXYGEN ACCEPTOR COMPOSITIONS IN THE RANGE OF FROM ABOUT 8 TO 70 WEIGHT %, B. HEATING SAID RAW COMPOSITION IN AN INERT ATMOSPHERE OR VACUUM TO EVOLVE CO2 FROM SAID RAW COMPOSITION AND TO CONVERT SAID BACO3 TO BAO AND TO PROVIDE A MOLE RATIO OF CO2 TO BAO2 IN THE RESULTANT PARTIALLY CONVERTED COMPOSITION OF LESS THAN 1.0, AND C. REACTING THE PARTIALLY CONVERTED COMPOSITION WITH OXYGEN AT AN ELEVATED TEMPERATURE AND COOLING SAID PARTIALLY CONVERTED COMPOSITION TO AMBIENT TEMPERATURE IN A SUBSTANTIALLY DRY,CO2-FREE OXYGEN-CONTAINING ATMOSPHERE HAVING A PARTIAL PRESSURE OF OXYGEN OF ABOVE ABOUT 0.2 ATMOSPHERES TO FORM SAID OXYGEN ACCEPTOR COMPOSITION PRODUCT HAVING BAO2, MGO AND CAO THEREIN.
Claim 3
Dependent Claim
14 words
A process as in claim 1 wherein said mole ratio is less than 0.84.
Claim 4
Dependent Claim
19 words
A process as in claim 1 wherein the temperature of said heating step is from about 1,600* to 2,000*F.
Claim 5
Dependent Claim
28 words
A process as in claim 4 wherein said inert atmosphere is a substantially dry, CO2-free gas selected from nitrogen, argon helium, substantially O2-free lean air, or mixtures thereof.
Claim 6
Dependent Claim
16 words
A process as in claim 1 wherein said MgCO3 and CaCO3 are present as a compound.
Claim 7
Dependent Claim
17 words
A process as in claim 5 wherein said MgCO3 and CaCO3 compound is a naturally occurring dolomite.
Claim 8
Dependent Claim
34 words
A process as in claim 1 wherein said BaCO3, MgCO3 and CaCO3 are supplied in the form of finely divided powders ranging from about 20 mesh to 320 mesh for mixing in step (a).
Claim 9
Dependent Claim
34 words
A process as in claim 6 wherein said BaCO3 and MgCO3-CaCO3 compound are supplied in the form of finely divided powders ranging from about 20 mesh to 320 mesh for mixing in step (a).
Claim 10
Dependent Claim
33 words
A process as in claim 7 wherein said BaCO3 and dolomite are supplied in the form of finely divided powders ranging from about 20 mesh to 320 mesh for mixing in step (a).
Claim 11
Dependent Claim
21 words
A process as in claim 8 which includes the step of pelleting said powders prior to said heating and reacting steps.
Claim 12
Dependent Claim
21 words
A process as in claim 9 which includes the step of pelleting said powders prior to said heating and reacting steps.
Claim 13
Dependent Claim
21 words
A process as in claim 10 which includes the step of pelleting said powders prior to said heating and reacting steps.
Claim 14
Dependent Claim
21 words
A process as in claim 8 which includes the step of pelleting said oxygen accEptor composition product after said reacting step.
Claim 15
Dependent Claim
36 words
A process as in claim 1 wherein said reacting step includes the step of introducing a substantially dry, CO2-free oxygen-containing gas into contact with said partially converted composition while said composition is at an elevated temperature.
Claim 16
Dependent Claim
40 words
A process as in claim 10 wherein said reacting step includes the step of cooling said partially converted composition to ambient temperature in a substantially dry, CO2-free oxygen-containing atmosphere, having a partial pressure of O2 of above about 0.2 atmospheres.
Claim 17
Dependent Claim
40 words
A process as in claim 13 wherein said reacting step includes the step of cooling said partially converted composition to ambient temperature in a substantially dry, CO2-free oxygen-containing atmosphere, having a partial pressure of O2 of above about 0.2 atmospheres.
Claim 18
Dependent Claim
38 words
A process as in claim 11 which includes the steps of crushing said pellet of oxygen acceptor composition to a size range suitable for use in, or for forming particles useful in a fluidized bed oxygen production operation.
Claim 19
Dependent Claim
37 words
A process as in claim 13 which includes the steps of crushing said pellet of oxygen acceptor composition to a size range suitable for use, or for forming particles useful in, a fluidized bed oxygen production operation.
Claim 20
Dependent Claim
24 words
A process as in claim 17 wherein said crushed particles are repelleted and recrushed to a size range suitable for said fluidized bed operation.
Claim 21
Dependent Claim
24 words
A process as in claim 18 wherein said crushed particles are repelleted and recrushed to a size range suitable for said fluidized bed operation.
Claim 22
Dependent Claim
49 words
A process as in claim 7 wherein the starting BaCO3 and dolomite are selected according to the relationship: Ro 1.166 Rg (1-DCO ), where Ro is the weight ratio of BaCO3/DQL produced in the oxygen acceptor composition product, and DCO is the weight fraction of CO2 in the dolomite.
Claim 23
Dependent Claim
13 words
An oxygen acceptor composition product produced according to the process of claim 1.
Claim 24
Dependent Claim
13 words
An oxygen acceptor composition product produced according to the process of claim 6.
Claim 25
Dependent Claim
13 words
An oxygen acceptor composition product produced according to the process of claim 7.
References Cited (Backward Citations)
US3773680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |