US3968002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed heating method for multiple effect evaporators
Assignee: Individual
•
Filing: 1975-03-07
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Granted: 1976-07-06
•
Expires: 1995-03-07
Abstract
Abstract A multiple effect evaporator in which the feed is progressively preheated in an indirect falling film preheater by vapors from the lower temperature effects and then further preheated by direct contact with vapors from higher temperature effects, said preheated feed being degassed during said direct contact preheating, prior to evaporation.
Inventors
- 👤 Ferris C. Standiford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:33
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/30; B01D1/26; Y; Y02; Y02A; Y02A20/00; Y02A20/124
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A feed preheater system for a forward feed multiple effect falling film evaporator, said system comprising a falling film indirect preheater and a direct vapor contacting preheater, the discharge of the former feeding the latter, said system being constructed and arranged to raise the temperature of the feed to below the atmospheric boiling point thereof in the falling film preheater, said falling film preheater being heated by vapors from the lower temperature effects and the direct contact preheater by vapor from a higher temperature effect, said preheated feed entering the highest temperature effect.
Claim 2
Dependent Claim
93 words
A feed preheater system for a forward feed multiple effect falling film evaporator, said system comprising a falling film indirect preheater and a direct vapor contacting preheater, the discharge of the former feeding the latter, said system being constructed and arranged to raise the temperature of the feed to below the atmospheric boiling point thereof in the falling film preheater, said falling film preheater being heated by vapors from the lower temperature effects and the direct contact preheater by vapor from a higher temperature effect, said preheated feed entering the highest temperature effect.
Claim 3
Dependent Claim
23 words
The system as defined in claim 1 wherein the preheated feed enters at least two of the highest temperature effects as parallel feed.
Claim 4
Dependent Claim
32 words
The system as defined in claim 1 wherein acid is added to the feed before said feed enters the direct contact preheater, whereby said direct contact preheater also serves as a decarbonator.
Claim 5
Dependent Claim
42 words
The system as defined in claim 1 wherein said direct contact preheater is pluralized and they are connected in series liquid feed flow and are in turn heated by vapors at successively higher pressures from intermediate higher pressure effects of the evaporator.
References Cited (Backward Citations)
US3119752A
Cited
US3303106A
Cited
US3494836A
Cited
US3702807A
Cited
US3832289A
Cited
US3830704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |