US3810346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removal of oil and water from compressed air
Assignee: SUMIDA EQUIP IND
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Filing: 1972-09-01
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Granted: 1974-05-14
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Expires: 1992-09-01
Abstract
Abstract Compressed air contaminated with water vapor and a mist of oil droplets is purified by spraying into the air a cold, liquid refrigerant (CCl3F, CHCl2F, C2Cl3F3, C2Cl2F4) which cools the air below its dew point without itself evaporating and absorbs the oil. The precipitating mixture of oil-bearing solvent and water is permitted to settle. An upper aqueous layer of water is removed by overflow, and the lower layer of solvent containing oil is recycled until it contains too much oil, whereupon it is separated from the oil by distillation.
Inventors
- 👤 E Uratani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:59
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method as set forth in claim 1, wherein said liquid coolant and said compressed air carrying said water vapor and said oil droplets are fed in respective continuous streams to an absorption zone for said dispersing of the coolant in the air, said coolant having said oil dissolved therein and said condensed water vapor are withdrawn jointly from said absorption zone and separately from said purified air to a settling zone for said settling, and the coolant in one of said recovered layers is cooled and thereafter returned to said dispersing zone.
Claim 2
Dependent Claim
22 words
the amount of said coolant being sufficient to avoid heating said coolant above the boiling point thereof by contact with said air,
Claim 3
Dependent Claim
12 words
said coolant being a better solvent for said oil than for water,
Claim 4
Dependent Claim
45 words
A method as set forth in claim 1, wherein said coolant has a boiling point of 0* to 50* C at atmospheric pressure, and the temperature of said compressed air is lower than the boiling point of said coolant at the pressure of said air.
Claim 5
Dependent Claim
26 words
A method as set forth in claim 3, wherein said coolant is a halogenated hydrocarbon selected from the group consisting of trichlorofluoromethane, dichlorofluoromethane, trichlorotrifluoroethane, and dichlorotetrafluoroethane.
Claim 6
Dependent Claim
75 words
the specific gravity of said solvent being substantially greater than that of water, whereby oil of said droplets is dissolved in said coolant and water vapor is condensed while said air is being purified; b. separating said coolant having said oil dissolved therein and said condensed water vapor from the purified compressed air; c. permitting the separated oil-bearing coolant and condensed water vapor to settle in respective superposed layers, and d. separately recovering said layers.
Claim 7
Dependent Claim
70 words
A method as set forth in claim 4, wherein said layer of oil-bearing coolant is heated to a temperature above the boiling point of said coolant and below the boiling point of said oil, and the resulting coolant vapor is condensed and further cooled below the boiling point of said coolant and thereafter dispersed in an additional amount of said compressed air carrying said water vapor and said oil droplets.
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |