US3389059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying water by distillation while preventing corrosionby selective phosphate and acid addition
Assignee: Aqua Chem Inc
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Filing: 1965-01-27
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Granted: 1968-06-18
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Expires: 1985-01-27
Abstract
No abstract record available.
Inventors
- 👤 Richard W Goeldner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:13
CPC Classifications
B; B01; B01D; B01D3/00; C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/042; C02F5/00; C02F5/02; C02F5/04; Y; Y10; Y10S; Y10S159/00; Y10S159/13; Y10S159/20; Y10S159/31; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A METHOD OF PURIFYING IMPURE WATER, WHICH METHOD COMPRISES TREATING A FEED STREAM OF THE WATER WITH POLYPHOSPHATE, TREATING THE POLYPHOSPHATE-TREATED FEED WATER WITH DILUTED ACID, DEAERATING THE RESULTING ACID-TREATED FEED WATER, THE FEED WATER AS A FEED TO A VAPOR COMPRESSION EVAPORATOR, OPERATING SAID EVAPORATOR FOR VAPORIZING FEED WATER AND COMPRESSING AND DIRECTING DISTILLATE THROUGH THE HEAT EXCHANGE TUBES FOR VAPORIZING ADDITIONAL FEED WATER TO FORM A DISTILLATE OVERHEAD AND BRINE BOTTOMS, RECOVERING RESULTING CONDENSATE FROM THE HEAT EXCHANGE TUBES, PASSING THE CONDENSATE IN HEAT EXCHANGE WITH FEED INTERMEDIATE THE POLYPHOSPHATE-TREATING STEP AND THE ACID-TREATING STEP FOR PREHEATING THE FEED WATER TO A TEMPERATURE NO HIGHER THAN ABOUT 200*F., WHEREBY THE POLYPHOSPHATE INHIBITS SCALE FORMATION IN THE HEAT EXCHANGER, WITHDRAWING BRINE FROM SAID EVAPORATOR, PASSING WITHDRAWN BRINE IN INDIRECT HEAT EXCHANGE WITH FEED INTERMEDIATE THE POLYPHOSPHATE-TREATING STEP AND THE ACIDTREATING STEP FOR PREHEATING FEED WATER TO A TEMPERATURE NO HIGHER THAN ABOUT 200*F., DETECTING THE PH OF THE EVAPORATOR BRINE, AND CONTROLLING THE RATE OF ACID ADDITION TO THE FEED WATERE IN THE ACID-TREATING STEP IN RESPONSE TO SUCH DETECTING FOR PROVIDING A PRESELECTED BRINE PH IN THE EVAPORATOR.
Claim 2
Independent Claim
190 words
A METHOD OF PURIFYING IMPURE WATER, WHICH METHOD COMPRISES TREATING A FEED STREAM OF THE WATER WITH POLYPHOSPHATE, TREATING THE POLYPHOSPHATE-TREATED FEED WATER WITH DILUTED ACID, DEAERATING THE RESULTING ACID-TREATED FEED WATER, THE FEED WATER AS A FEED TO A VAPOR COMPRESSION EVAPORATOR, OPERATING SAID EVAPORATOR FOR VAPORIZING FEED WATER AND COMPRESSING AND DIRECTING DISTILLATE THROUGH THE HEAT EXCHANGE TUBES FOR VAPORIZING ADDITIONAL FEED WATER TO FORM A DISTILLATE OVERHEAD AND BRINE BOTTOMS, RECOVERING RESULTING CONDENSATE FROM THE HEAT EXCHANGE TUBES, PASSING THE CONDENSATE IN HEAT EXCHANGE WITH FEED INTERMEDIATE THE POLYPHOSPHATE-TREATING STEP AND THE ACID-TREATING STEP FOR PREHEATING THE FEED WATER TO A TEMPERATURE NO HIGHER THAN ABOUT 200*F., WHEREBY THE POLYPHOSPHATE INHIBITS SCALE FORMATION IN THE HEAT EXCHANGER, WITHDRAWING BRINE FROM SAID EVAPORATOR, PASSING WITHDRAWN BRINE IN INDIRECT HEAT EXCHANGE WITH FEED INTERMEDIATE THE POLYPHOSPHATE-TREATING STEP AND THE ACIDTREATING STEP FOR PREHEATING FEED WATER TO A TEMPERATURE NO HIGHER THAN ABOUT 200*F., DETECTING THE PH OF THE EVAPORATOR BRINE, AND CONTROLLING THE RATE OF ACID ADDITION TO THE FEED WATERE IN THE ACID-TREATING STEP IN RESPONSE TO SUCH DETECTING FOR PROVIDING A PRESELECTED BRINE PH IN THE EVAPORATOR.
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |