US4563295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature absorbent for water vapor
Assignee: Individual
•
Filing: 1983-08-04
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Granted: 1986-01-07
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Expires: 2003-08-04
Abstract
Abstract The invention discloses a novel binary composition of matter for use in absorption cycles and similar applications requiring the reversible absorption and desorption of water vapor. The composition comprises an aqueous solution wherein the nonaqueous component consists essentially of a mixture of alkali metal nitrates optionally admixed with at least one alkali metal nitrite.
Inventors
- 👤 Donald C. Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:09
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
37 words
In an absorption cycle apparatus of conventional and widely known type wherein the working fluid is water, the improvement comprising an absorbent comprised of an aqueous mixture of alkali metal nitrates which contains essentially no nitrite anion.
Claim 2
Dependent Claim
37 words
In an absorption cycle apparatus of conventional and widely known type wherein the working fluid is water, the improvement comprising an absorbent comprised of an aqueous mixture of alkali metal nitrates which contains essentially no nitrite anion.
Claim 3
Dependent Claim
20 words
The apparatus according to claim 1 wherein the absorbent comprises a mixture of lithium nitrate, sodium nitrate, and potassium nitrate.
Claim 4
Dependent Claim
46 words
The apparatus according to claim 2 wherein the mixture comprises at least 20 molar percent each of lithium and potassium nitrates and at least 10 mole percent sodium nitrate, and wherein the absorbent is subjected to temperatures in excess of 200° C. in the absorption cycle.
Claim 5
Dependent Claim
45 words
A process for drying a hot gas by contacting the hot gas with an aqueous absorbent solution wherein the nonaqueous component consists essentially of at least two alkali metal cations and nitrate anions, and at most one of the components lithium cations and nitrite anions.
Claim 6
Dependent Claim
45 words
A process for drying a hot gas by contacting the hot gas with an aqueous absorbent solution wherein the nonaqueous component consists essentially of at least two alkali metal cations and nitrate anions, and at most one of the components lithium cations and nitrite anions.
Claim 7
Dependent Claim
18 words
The process according to claim 4 wherein water comprises between 1 and 50 mole percent of the solution.
Claim 8
Dependent Claim
24 words
The process according to claim 5 wherein the anhydrous component consists of at least 10 ionic percent each of lithium, sodium, and potassium cations.
Claim 9
Dependent Claim
13 words
The process according to claim 5 wherein the anhydrous component contains nitrite anions.
Claim 10
Dependent Claim
18 words
The process according to claim 4 wherein the anhydrous component contains at least 10 ionic percent lithium cations.
Claim 11
Dependent Claim
18 words
The process according to claim 4 wherein the anhydrous component contains at least 10 ionic percent lithium cations.
Claim 12
Dependent Claim
48 words
A process comprising evaporating water to produce cooling, and absorbing the vapor into an aqueous absorbent in which the anhydrous component of the absorbent consists essentially of at least 20 mole percent LiNO 3 , 20 mole percent KNO 3 , and 10 mole percent NaNO 3 .
Claim 13
Dependent Claim
48 words
A process comprising evaporating water to produce cooling, and absorbing the vapor into an aqueous absorbent in which the anhydrous component of the absorbent consists essentially of at least 20 mole percent LiNO 3 , 20 mole percent KNO 3 , and 10 mole percent NaNO 3 .
Claim 14
Dependent Claim
17 words
The process according to claim 10 further comprised of exposing the absorbent to temperatures above 200° C.
References Cited (Backward Citations)
DE2942697A1
Cited
US4454724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |