Patent US4454724A successfully refreshed from Google Patents.
US4454724A
Expired / Lapsed
US
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Aqueous absorbent for absorption cycle heat pump
Assignee: Individual
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Filing: 1982-09-29
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Granted: 1984-06-19
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Expires: 2002-09-29
Abstract
Abstract The invention comprises solution compositions suitable for absorbing and desorbing useful quantities of water vapor at high boiling point elevations, and, hence, which are useful in conjunction with H 2 O as the absorbent pair in absorption cycle heat pumps. The nonaqueous component of the solution is comprised of at least 35 mole percent LiNO 3 and at least 35 mole percent alkali nitrite. The absorbent is particularly useful in high temperature absorption cycles, i.e., with maximum temperatures in the range of 130° C. to 260° C. or even higher.
Inventors
- 👤 Donald C. Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:42
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
An aqueous absorbent solution comprised of water and a nonaqueous component wherein the nonaqueous component comprises at least 35 mole percent LiNO 3 and at least 35 mole percent alkali metal nitrite, and wherein water comprises between 2 and 50 weight percent of the solution.
Claim 2
Dependent Claim
45 words
An aqueous absorbent solution comprised of water and a nonaqueous component wherein the nonaqueous component comprises at least 35 mole percent LiNO 3 and at least 35 mole percent alkali metal nitrite, and wherein water comprises between 2 and 50 weight percent of the solution.
Claim 3
Dependent Claim
31 words
The composition according to claim 1 wherein the nonaqueous component consists of 50 weight percent LiNO 3 , 30 weight percent NaNO 2 , and 20 weight percent KNO 2 .
Claim 4
Dependent Claim
37 words
The composition according to claim 1 wherein the nonaqueous component consists of 40 to 60 weight percent LiNO 3 , 20 to 30 weight percent LiNO 2 , and 20 to 30 weight percent NaNO 2 .
Claim 5
Dependent Claim
25 words
The composition according to claim 1 wherein the nonaqueous component is comprised additionally of up to 30 weight percent of lithium halide, glycol, or alcohol.
Claim 6
Dependent Claim
102 words
In a process in which steam is absorbed at a first pressure into an absorbent solution at a first temperature which is at least 30° C. above the steam saturation temperature, and in which steam at a second pressure different from the first is desorbed out of the absorbent solution at a second temperature which is at least 30° C. above saturation temperature of the second pressure steam, the improvement comprising: providing as the absorbent solution an aqueous solution in which the nonaqueous component is comprised of at least 35 mole percent LiNO 3 and at least 35 mole percent alkali nitrite.
Claim 7
Dependent Claim
102 words
In a process in which steam is absorbed at a first pressure into an absorbent solution at a first temperature which is at least 30° C. above the steam saturation temperature, and in which steam at a second pressure different from the first is desorbed out of the absorbent solution at a second temperature which is at least 30° C. above saturation temperature of the second pressure steam, the improvement comprising: providing as the absorbent solution an aqueous solution in which the nonaqueous component is comprised of at least 35 mole percent LiNO 3 and at least 35 mole percent alkali nitrite.
Claim 8
Dependent Claim
20 words
The process according to claim 5 further comprising raising absorbent pressure for the desorption step, whereby a forward cycle results.
Claim 9
Dependent Claim
20 words
The process according to claim 5 further comprising lowering absorbent pressure for the desorption step, whereby a reverse cycle results.
Claim 10
Dependent Claim
24 words
The process according to claim 5 in which the nonaqueous component is comprised of at least 25 mole percent N 2 NO 2 .
References Cited (Backward Citations)
JPS5510830A
Cited
US4311024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |