Production of fertilizers
Abstract
Abstract THE INVENTION RELATES TO THE PRODUCTION OF FERTILIZERS, IN PARTICULAR POTASSIUM DIHYDROGEN PHOSPHATE. THIS IS OBTAINED THROUGH ACID ATTACH ON PHOSPHATE ROCK BY A MEDIUM OBTAINED BY THE REACTION OF SULPHURIC ACID WITH PARTICULAR, THE PHOSPHATE ROCK IS REACTED WITH A MEDIUM COMPRISING POTASSIUM BISULPHATE, SULPHURIC ACID AND PHOSPHORIC ACID. AS A RESULT, THE SOLID CALCIUM SULPHATE FORMED IN THE REACTION MIXTURE CAN BE READILY FILTERED OFF FROM THE MOTHER LIQOUR AND THE POTASSIUM DIHYDROGEN PHOSPHATE PRODUCT CAN BE RECOVERED IN A COMEMRCIALLY OPERATIVE PROCESS. THE MOTHER LIQOUR CONTAINING PHOSPHORIC ACID AND POTASSIUM DIHYDROGEN PHOSPHATE IS RECYCLED TO THE ORIGINAL REACTION MIXTURE.
Inventors
- 👤 W Thompson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |