Production of sodium perborate
Abstract
Abstract A PROCESS FOR PRODUCING SODIUM PERBORATE HAVING A RELATIVELY LOW BULK DENSITY AND A RELATIVELY HIGH SOLUTION RATE WHEREIN SODIUM METABORATE AND HYDROGEN PERODIDE ARE FED TO AND REACTED IN AN AQUEOUS REACTION SLURRY OF SODIUM PERBORATE FROM WHICH THE SODIUM PERBORATE IS CRYSTALIZED IN MORE THAN ONE CRYSTATLIZATION ZONE. THE CRYSTALLIZATION IN THE FIRST ZONE IS EFFECTED IN THE PRESENCE OF A RELATIVELY HIGH CONCENTRATION OF EXCESS SODIUM METABORATE AND THE COMPLETION OF THE CRYSTALLIZATION IS EFFECTED IN ONE OR MORE SUBSEQUENT ZONE IN THE PRESENCE OF A RELATIVELY LOW CONCENTRATION OF EXCESS SODIUM METABORATE RESULTING FROM THE ADDITION OF HYDROGEN PEROXIDE TO THE SLURRY IN THE SUBSEQUENT CRYSTALLIZATION ZONE.
Inventors
- 👤 Victor J Reilly
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |