Patent US3876387A successfully refreshed from Google Patents.
US3876387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing burkeite
Assignee: North American Chemical Co
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Filing: 1972-03-13
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Granted: 1975-04-08
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Expires: 1992-03-13
Abstract
Abstract The present invention relates to a method of producing burkeite crystals from a brine. More particularly, it relates to a method wherein the brine is heated in several stages. In the last stage, heating is accomplished by the direct introduction of steam into the brine.
Inventors
- 👤 Norman William Coulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:41
CPC Classifications
C; C01; C01D; C01D7/00; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
A METHOD OF PRODUCING BURKEITE CRYSTALS FROM A FEED BRINE CONTAINING BURKEITE AND SODIUM CHLORIDE COMPRISING: A. PROVIDING AT LEAST A FIRST ANND LAST HEATING ZONE, B. PROVIDING AT LEAST A FIRST AND LAST EVAPORATOR ZONE, C. PROVIDING A CRYSTALLIZING ZONE, D. A MAINTAINING A BODY OF BRINE AND WARM VAPORS IN EACH OF SAID EVAPORATOR ZONES, E. PASSING THE FEED BRINE SEQUENTIALLY THROUGH SAID FIRST AND LAST HEATER ZONES, F. WITHDRAWING A STREAM OF WARM VAPORS FROM SAID FIRST EVAPORATOR ZONE AND INTRODUCING IT INTO SAID FIRST HEATING ZONE, WITHDRAWING A STREAM OOF WARM VAPORS FROM SAID LAST EVAPORATOR ZONE AND INTRODUCING IT INTO SAID LEAST HEATING ZONE, G. INTRODUCING THE FEED BRINE FROM SAID LAST HEATING ZONE INTO A CRYSTALLIZING ZONE, H. INTRODUCING STEAM INTO THE BRINE IN SAID CRYSTALLIZING ZONE WHEREBY THE BRINE IS HEATED TO A TEMPERATURE OF AT LEAST 175*F. AND A SUBSTANTIAL PORTION OF THE BURKEITE CONTAINED THEREIN IS CRYSTALLIZED, I. WITHDRAWING THE BURKEITE CRYSTAL-CONTAINING BRINE FROM SAID CRYSTALLIZING ZONE, SEPARATING AND RECOVERING THE BURKEITE CRYSTALS FROM THE BRINE AND, J. PASSING THE SUBSTANTIALLY BURKEITE CRYSTALFREE BRINE THROUGH SAID LAST EVAPORATOR ZONE INTO SAID FIRST EVAPORATOR ZONE.
Claim 2
Independent Claim
193 words
A METHOD OF PRODUCING BURKEITE CRYSTALS FROM A FEED BRINE CONTAINING BURKEITE AND SODIUM CHLORIDE COMPRISING: A. PROVIDING AT LEAST A FIRST ANND LAST HEATING ZONE, B. PROVIDING AT LEAST A FIRST AND LAST EVAPORATOR ZONE, C. PROVIDING A CRYSTALLIZING ZONE, D. A MAINTAINING A BODY OF BRINE AND WARM VAPORS IN EACH OF SAID EVAPORATOR ZONES, E. PASSING THE FEED BRINE SEQUENTIALLY THROUGH SAID FIRST AND LAST HEATER ZONES, F. WITHDRAWING A STREAM OF WARM VAPORS FROM SAID FIRST EVAPORATOR ZONE AND INTRODUCING IT INTO SAID FIRST HEATING ZONE, WITHDRAWING A STREAM OOF WARM VAPORS FROM SAID LAST EVAPORATOR ZONE AND INTRODUCING IT INTO SAID LEAST HEATING ZONE, G. INTRODUCING THE FEED BRINE FROM SAID LAST HEATING ZONE INTO A CRYSTALLIZING ZONE, H. INTRODUCING STEAM INTO THE BRINE IN SAID CRYSTALLIZING ZONE WHEREBY THE BRINE IS HEATED TO A TEMPERATURE OF AT LEAST 175*F. AND A SUBSTANTIAL PORTION OF THE BURKEITE CONTAINED THEREIN IS CRYSTALLIZED, I. WITHDRAWING THE BURKEITE CRYSTAL-CONTAINING BRINE FROM SAID CRYSTALLIZING ZONE, SEPARATING AND RECOVERING THE BURKEITE CRYSTALS FROM THE BRINE AND, J. PASSING THE SUBSTANTIALLY BURKEITE CRYSTALFREE BRINE THROUGH SAID LAST EVAPORATOR ZONE INTO SAID FIRST EVAPORATOR ZONE.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said substantially burkeite crystal-free brine from said first evaporator zone is passed to a separation zone and recovering a portion of the sodium chloride from said brine.
Claim 4
Dependent Claim
75 words
The method of claim 1 wherein there is provided a first through fifth heating zones and a first through fifth evaporator zones and a stream of warm vapors is withdrawn from each evaporator zone and introduced into the corresponding heating zone, the brine is passed sequentially through the first through fifth heating zones into the crystallizing zone and the substantially burkeite crystal-free brine is passed sequentially and countercurrently through the fifth through first evaporator zones.
Claim 5
Dependent Claim
38 words
The method of claim 1 wherein additional sodium chloride is added to said feed brine, intermediate said first and last heating zones, in an amount sufficient to maintain said brine substantially saturated with respect to said sodium chloride.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |