US3766027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for co{11 {11 conversion to methane
Assignee: Gas Technology Institute
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Filing: 1972-02-04
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Granted: 1973-10-16
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Expires: 1992-02-04
Abstract
Abstract A process of fixation and conversion of carbon dioxide from the atmosphere or other sources to produce methane and oxygen. Carbon dioxide is scrubbed from a CO2-containing source and separated by process of chemical concentration. A special cell is provided in which hydrogen is produced and reacted with the separated CO2 at methanation conditions to produce methane.
Inventors
- 👤 D Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
C; C10; C10L; C10L3/00; C10L3/06; C10L3/08; C07; C07C; C07C1/00; C07C1/02; C07C1/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A process of claim 1 wherein the carbon dioxide selective sorbent is selected from a. molecular sieves, b. aqueous solutions of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, c. monoethanolamine, diethanolamine, triethanolamine, methyl-2-pyrrolidone, d. diamino isopropanol, methanol and e. mixtures thereof.
Claim 2
Dependent Claim
21 words
A process of claim 2 wherein the carbon dioxide selective sorbent is selected from mono-, di-, and triethanolamine, methyl-2-pyrrolidone, and methanol.
Claim 3
Dependent Claim
30 words
A process of claim 1 which includes the added step of transferring the exothermic heat of reaction produced in said reaction zone to said desorption zone to selectively effect desorption.
Claim 4
Dependent Claim
46 words
A process as in claim 3 which includes the steps of: g. passing said carbon dioxide-containing sorbent produced in step (a) into a desorption zone to effect desorption therein, and h. recycling said regenerated sorbent into contact with said air to effect resorption of carbon dioxide.
Claim 5
Dependent Claim
33 words
A process as in claim 1 which includes the step of: g. passing a portion of said methane-containing gas mixture to the desorption zone as said oxygen-free gaseous stream to effect said desorption.
Claim 6
Dependent Claim
41 words
A process as in claim 1 wherein said step (f) of methane recovery includes the step of separation of water from said methane-containing gas mixture, and which includes the added step of: g. recycling said water to said electrochemical reaction zone.
Claim 7
Dependent Claim
32 words
A process as in claim 1 wherein said step (f) of methane recovery from said methane-containing gas mixture includes separation therefrom of residual CO2, H2 and CO produced in said methanation zone.
Claim 8
Dependent Claim
18 words
A process as in claim 8 wherein said residual CO2 and H2 are recycled to said methanation zone.
Claim 9
Dependent Claim
25 words
A process as in claim 8 wherein said residual CO2 and H2 are recycled to said desorption step (b) as said oxygen-free gaseous desorption stream.
Claim 10
Dependent Claim
26 words
A process as in claim 1 wherein said desorption step (b) is maintained at a temperature within the range of from about 100* to 1,000* F.
Claim 11
Dependent Claim
27 words
A process as in claim 1 wherein said electrolysis methanation step (d) is maintained at a temperature within the range of from about 250* to 2,000* F.
Claim 12
Dependent Claim
24 words
A process as in claim 1 which includes the step of: g. passing said recovered methane to said desorption zone to effect said desorption.
Claim 13
Dependent Claim
23 words
A process as in claim 1 wherein said reaction zone utilizes an electrolyte selected from an acid, a carbonate or a solid oxide.
Claim 14
Dependent Claim
11 words
A process as in claim 1 wherein said gas is air.
Claim 15
Dependent Claim
17 words
A process as in claim 1 wherein said gas is process flue gas relatively rich in CO2.
References Cited (Backward Citations)
US1730997A
Cited
US1431047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |