US3854301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic absorption cycles
Assignee: Individual
•
Filing: 1971-06-11
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Granted: 1974-12-17
•
Expires: 1991-06-11
Abstract
Abstract For the development of power and/or the production of cryogenic fluids, e.g., oxygen, absorption refrigeration cycles are employed. For example, one process comprises the steps of absorbing a refrigerant vapor in a liquid absorbent, increasing the pressure on resultant mixture of said refrigerant and said absorbent, distilling and rectifying the mixture into substantially pure refrigerant vapor and pure absorbent, reducing the pressure on resultant pure liquid absorbent and returning the latter to the absorbing step, cooling and condensing the refrigerant vapor to the liquid state, reducing the pressure upon the liquid refrigerant to below the triple point of the refrigerant to produce solid refrigerant, sublimating the solid refrigerant to the vapor state, and passing resultant refrigerant vapor to the absorbing step at a rate that maintains the pressure below the triple point.
Inventors
- 👤 E Cytryn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:34
CPC Classifications
F; F25; F25B; F25B15/00; F25J; F25J1/00; F25J1/0002; F25J1/0012; F25J1/003; F25J1/0032; F25J1/0035; F25J1/02; F25J1/0225; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04278; F25J2260/00; F25J2260/30; F25J2270/00; F25J2270/90; F25J2270/906; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62; Y10; Y10S; Y10S203/00; Y10S203/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A refrigeration process comprising the steps of: absorbing a refrigerant vapor in a liquid absorbent; increasing the pressure on resultant mixture of said refrigerant and said absorbent; distilling and rectifying the mixture into substantially pure refrigerant vapor and pure absorbent; reducing the pressure on resultant pure liquid absorbent and returning the latter to the absorbing step; cooling and condensing the refrigerant vapor to the liquid state; reducing the pressure upon the liquid refrigerant to below the triple point of the refrigerant to produce solid refrigerant; sublimating the solid refrigerant to the vapor state; and passing resultant refrigerant vapor to the absorbing step at a rate that maintains the pressure below the triple point.
Claim 2
Dependent Claim
113 words
A refrigeration process comprising the steps of: absorbing a refrigerant vapor in a liquid absorbent; increasing the pressure on resultant mixture of said refrigerant and said absorbent; distilling and rectifying the mixture into substantially pure refrigerant vapor and pure absorbent; reducing the pressure on resultant pure liquid absorbent and returning the latter to the absorbing step; cooling and condensing the refrigerant vapor to the liquid state; reducing the pressure upon the liquid refrigerant to below the triple point of the refrigerant to produce solid refrigerant; sublimating the solid refrigerant to the vapor state; and passing resultant refrigerant vapor to the absorbing step at a rate that maintains the pressure below the triple point.
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein prior to the sublimating step the liquid refrigerant is passed through a porous plate and solid refrigerant is formed in said plate.
Claim 4
Dependent Claim
16 words
A process according to claim 2 wherein the porous plate is heated to sublimate the refrigerant.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein the passage of the refrigerant from the sublimation step to the absorbing step is induced by mechanical means.
Claim 6
Dependent Claim
28 words
A process according to claim 1 in which the pressure on the liquid absorbent is reduced by passing said liquid absorbent through a turbine, thereby recovering energy therefrom.
Claim 7
Dependent Claim
63 words
A process according to claim 1 in which the refrigerant is selected from the group consisting of nitrogen, hydrogen, neon, helium and hydrocarbon having a saturation pressure between that of butane and methane; and the absorbent is a liquid having a freezing point below the temperature of the process and selected from the group consisting of a hydrocarbon liquid and an inorganic liquid.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein the refrigerant is methane and the absorbent is selected from ethane and propane.
Claim 9
Dependent Claim
25 words
A process according to claim 1 wherein the cooling and condensing of the refrigerant is conducted in heat exchange with a separate absorbent refrigeration cycle.
Claim 10
Dependent Claim
26 words
A process according to claim 1 wherein the heat for distilling and rectifying the mixture is supplied by heat exchange with a separate absorbent refrigeration cycle.
Claim 11
Dependent Claim
133 words
A process for the recovery of energy and refrigeration comprising the steps of: absorbing a refrigerant vapor in a liquid absorbent; increasing the pressure on the resultant mixture of refrigerant and absorbent; distilling and rectifying the mixture into substantially pure refrigerant vapor and pure absorbent; heating the refrigerant vapor from the distillation step by indirect heat exchange with absorbent from the distillation step, to simultaneously increase the temperature of the vapoR refrigerant and reduce the temperature and pressure of the liquid absorbent; recovering energy from the refrigerant vapor by reducing its temperature and pressure; condensing the vaporous refrigerant to the liquid state; recovering the energy of the liquid refrigerant by reducing its pressure and temperature; evaporating the liquid refrigerant under reduced pressure; and returning the absorbent and the refrigerant to the absorbing step.
Claim 12
Dependent Claim
133 words
A process for the recovery of energy and refrigeration comprising the steps of: absorbing a refrigerant vapor in a liquid absorbent; increasing the pressure on the resultant mixture of refrigerant and absorbent; distilling and rectifying the mixture into substantially pure refrigerant vapor and pure absorbent; heating the refrigerant vapor from the distillation step by indirect heat exchange with absorbent from the distillation step, to simultaneously increase the temperature of the vapoR refrigerant and reduce the temperature and pressure of the liquid absorbent; recovering energy from the refrigerant vapor by reducing its temperature and pressure; condensing the vaporous refrigerant to the liquid state; recovering the energy of the liquid refrigerant by reducing its pressure and temperature; evaporating the liquid refrigerant under reduced pressure; and returning the absorbent and the refrigerant to the absorbing step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |