US3638708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of multiple stage evaporation from heat sources other than steam
Assignee: Marathon Engineering Inc
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Filing: 1969-06-11
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Granted: 1972-02-01
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Expires: 1989-06-11
Abstract
Abstract A method of multiple stage evaporation incorporating direct contact evaporation, with the flue gas utilized to heat water, the heated water utilized to heat liquor for flash evaporation to a vacuum. The condensed vapors are then used to heat liquor that is air contact evaporated to provide 3 stages of evaporation. Low-quality flue gas heat is also used to heat liquor for air contact evaporation.
Inventors
- 👤 William G Farin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:32
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/26; B01D3/00; B01D3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
The method set forth in claim 1, wherein the said flue gas cooled by direct contact with said circulating water stream are further cooled by a third direct contact with a second circulating water stream whereby the said second water stream is heated and the heat of condensation of the gas borne saturated vapor recovered in the heated and collected water stream at the reduced saturation point of the cooled flue gas; circulating the said second water stream resulting from said third direct contact through an indirect heat exchanger, cooling the said second water stream with a portion of the flow of the said third liquor flow of liquor being concentrated in said indirect heat exchanger, thereby heating a portion of said third flow of liquor being concentrated for air contact evaporation.
Claim 2
Dependent Claim
55 words
The method set forth in claim 1, wherein the said flue gas with moisture content raised to near its saturation point following direct contact evaporation with the first flow of liquor being concentrated, is contacted with a separate circulating water stream at near the flue gas saturation temperature to remove contaminants before said subsequent cooling.
References Cited (Backward Citations)
US2343027A
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US2839122A
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US2764234A
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US2770295A
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US2901061A
Cited
US3323289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |