US2970037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trona process
Assignee: FMC Corp
•
Filing: 1955-11-22
•
Granted: 1961-01-31
•
Expires: 1975-11-22
Abstract
No abstract record available.
Inventors
- 👤 Ned A Caldwell
- 👤 William C Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:38
CPC Classifications
C; C01; C01D; C01D7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A CYCLIC PROCESS FOR THE PRODUCTION OF DENSE SODA ASH FROM CRUDE TRONA COMPRISING DISSOLVING THE TRONA IN AN AQUEOUS SOLUTION OF SODIUM CARBONATE AND SODIUM BICARBONATE HAVING A GREATER CONCENTRATION OF NORMAL CARBONATE THAN BICARBONATE, CRYSTALLIZING SODIUM SESQUICARBONATE BY COOLING, SEPARATING THE SESQUICARBONATE CRYSTALS AND THE MOTHER LIQUOR SOLUTION, DISCARDING A PORTION OF THE MOTHER LIQUOR SOLUTION TO MAINTAIN THE DESIRED CARBONATE TO BICARBONATE RATIO, RECIRCULATING THE REMAINDER OF THE MOTHER LIQUOR SOLUTION TO DISSOLVE MORE TRONA, CALCINING THE SESQUICARBONATE CRYSTALS TO LIGHT ASH AND RECOVERING THE SODIUM VALUES IN SAID DISCARDED MOTHER LIQUOR BY REACTING A PORTION OF THE LIGHT ASH WITH A PORTION OF SAID MOTHER LIQUOR SOLUTION TO FORM SODIUM CARBONATE MONOHYDRATE@ AND CALCINING THE SODIUM CARBONATE MONOHYDRATE TO FORM DENSE ASH AND USING ONLY SUFFICIENT OF SAID MOTHER LIQUOR TO PROVIDE WATER TO STOICHIOMETRICALLY REACT WITH THE AVAILABLE SODIUM CARBONATE IN SAID LIGHT ASH AND SAID MOTHER LIQUOR IN A MOLAR RATIO OF ABOUT 1:1 TO FORM SODIUM CARBONATE MONOHYDRATE BY REHYDRATION AND TO REPLACE THE WATER EVAPORATED IN THE HYDRATION STEP.
Claim 2
Dependent Claim
177 words
A CYCLIC PROCESS FOR THE PRODUCTION OF DENSE SODA ASH FROM CRUDE TRONA COMPRISING DISSOLVING THE TRONA IN AN AQUEOUS SOLUTION OF SODIUM CARBONATE AND SODIUM BICARBONATE HAVING A GREATER CONCENTRATION OF NORMAL CARBONATE THAN BICARBONATE, CRYSTALLIZING SODIUM SESQUICARBONATE BY COOLING, SEPARATING THE SESQUICARBONATE CRYSTALS AND THE MOTHER LIQUOR SOLUTION, DISCARDING A PORTION OF THE MOTHER LIQUOR SOLUTION TO MAINTAIN THE DESIRED CARBONATE TO BICARBONATE RATIO, RECIRCULATING THE REMAINDER OF THE MOTHER LIQUOR SOLUTION TO DISSOLVE MORE TRONA, CALCINING THE SESQUICARBONATE CRYSTALS TO LIGHT ASH AND RECOVERING THE SODIUM VALUES IN SAID DISCARDED MOTHER LIQUOR BY REACTING A PORTION OF THE LIGHT ASH WITH A PORTION OF SAID MOTHER LIQUOR SOLUTION TO FORM SODIUM CARBONATE MONOHYDRATE@ AND CALCINING THE SODIUM CARBONATE MONOHYDRATE TO FORM DENSE ASH AND USING ONLY SUFFICIENT OF SAID MOTHER LIQUOR TO PROVIDE WATER TO STOICHIOMETRICALLY REACT WITH THE AVAILABLE SODIUM CARBONATE IN SAID LIGHT ASH AND SAID MOTHER LIQUOR IN A MOLAR RATIO OF ABOUT 1:1 TO FORM SODIUM CARBONATE MONOHYDRATE BY REHYDRATION AND TO REPLACE THE WATER EVAPORATED IN THE HYDRATION STEP.
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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |