US4039620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endothermal carbon dioxide absorption
Assignee: Scott Technologies Inc
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Filing: 1975-04-25
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Granted: 1977-08-02
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Expires: 1995-04-25
Abstract
Abstract The absorption of CO 2 from gas streams by lithium hydroxide can be caused to proceed at least partially by the reaction ##STR1## The reaction is endothermal, and more efficient than the normally occurring reaction. The presence of a molecular sieve and water favor the bicarbonate reaction.
Inventors
- 👤 Loyal G. Netteland
- 👤 Clifford E. Heintz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:18
CPC Classifications
A; A62; A62B; A62B19/00; A62D; A62D9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
The method of removing carbon dioxide from a gas stream containing moisture, at least in part according to the reaction ##STR3## comprising the steps of passing the gas stream directly through lithuim hydroxide and immediately thereafter through a molecular sieve.
Claim 2
Independent Claim
40 words
The method of removing carbon dioxide from a gas stream containing moisture, at least in part according to the reaction ##STR3## comprising the steps of passing the gas stream directly through lithuim hydroxide and immediately thereafter through a molecular sieve.
Claim 3
Dependent Claim
69 words
The method of claim 1 comprising the steps of first passing the gas stream through a first chamber containing lithium hydroxide as the carbon dioxide absorbent; immediately thereafter passing the stream through a second chamber containing hydrated molecular seive containing about 40 to 60 moles of water, per mole of said seive; and removing from said second chamber a gas stream having reduced levels of CO 2 and moisture.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the molecular seive is a crystalline zeolite.
Claim 5
Dependent Claim
11 words
The method of claim 3 wherein the zeolite is zeolite X.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the zeolite is zeolite 13X.
Claim 7
Dependent Claim
51 words
The method of claim 2 wherein at least some of the removed gas stream is recirculated through the first chamber containing lithium hydroxide and then through the second chamber containing the molecular seive until the carbon dioxide is substantially removed and the relative humidity is reduced to a very low level.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the molecular seive is crystalline zeolite.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the zeolite is zeolite X.
Claim 10
Dependent Claim
11 words
The method of claim 7 wherein the zeolite is zeolite 13X.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |