Sodium dithionite solution stabilization
Abstract
Abstract SODIUM DITHIONITE IN AQUEOUS SOLUTION IS WIDELY USED IN BLEACHING AND VAT DYEING OF TEXTILES. UNFORTUNATELY, HOWEVER, LOSSES OCCUR NOT ONLY THROUGH DECOMPOSITION DURING DISSOLVING OF THE SALT IN QUESTION , BUT ALSO DURING STORAGE OF THE SOLUTION. IT HAS BEEN DISCOVERED THAT THE LOSSES BY DECOMPOSTION IN A 5% AQUEOUS SOLUTION CAN BE SIGNIFICANTLY REDUCED BY THE ADDITION OF APPROXIMATELY 0.2% ZINC SULFATE. HERE THE RATE OF ANAEROBIC DECOMPOSITION IN THE PROTECTED SODIUM DITHIONITE SOLUTION WAS DECREASED TO 6% OF THE RATE FOR AN UNPROTECTED SYSTEM. AS TO THE STRONGER GRADES OF THE BLEACHING SOLUTION, VIZ: 15.0% TO 17.7% BY ADDITION OF 1.6% ZINC SULFATE, THE ANAEROBIC DECOMPOSITION RATES WERE REDUCED TO 25% TO 80% OF THOSE FOR UNPROTECTED BLEACHING SOLUTIONS IN STORAGE.
Inventors
- 👤 Mearl A Kise
- 👤 Leonard C Ellis
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |