Ammonium polyphosphate solutions from super wet acid
Abstract
Abstract STABLE LIQUID FERTILIZERS HAVING 80 PERCENT OR MORE OF THE TOTAL P2O5 IN POLYPHOSPHATE FORM ARE PREPARED FROM WET-PROCESS SUPERPHOSPHORIC ACID WITH A POLYPHOSPHATE CONTENT RANGING FROM THE NORMAL AMOUNT OF ABOUT 50 PERCENT DOWN TO ABOUT ONLY 5 PERCENT. CONDENSATION OF THE P2O5 IN THE ACID IN THE ORTHO FORM TO THE PYRO AND MORE HIGHLY CONDENSED FORMS OF POLYPHOSPHATES IS ACCOMPLISHED BY USING THE ENERGY AVAILABLE FROM THE HEAT OF REACTION OF THE AMMONIA AND ACID. THE PROCESS IS CARRIED OUT IN A SIMPLE PIPE REACTOR WHERE THE ACID AND AMMONIA REACT TO FORM A MELT AT TEMPERATURES IN THE RANGE OF 600-700*F. THE MELT IS QUENCHED IN COOLED LIQUID FERTILIZER WHERE THE ADDITIONAL AMMONIA REQUIRED TO MAKE THE DESIRED N:P2O5 RATIO IS FIXED AND THE WATER REQUIRED TO MAKE THE DESIRED GRADE OF FERTILIZER IS ADDED.
Inventors
- 👤 R Meline
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |