Removal of inorganic catalysts from polyols
Abstract
Abstract A METHOD FOR REMOVING WATER-SOLUBLE IMPURITIES FROM WATER-INSOLUBLE POLYETHERS WHICH COMPRISES PROVIDING A MIXTURE OF WATER, POLYETHER, AND A SOLVENT WHICH IS SUBSTANTIALLY IMMISCIBLE IN WATER, WHICH HAS A DENSITY SUBSTANTIALLY DIFFERENT FROM WATER IN WHICH THE POLYETHER IS SOLUBLE AND WHICH IS RELATIVELY INERT WITH RESPECT TO THE POLYETHER AND WATER, WHEREBY A POLYETHER-SOLVENT SOLUTION IS FORMED WHICH IS SUBSTANTIALLY IMMISCIBLE IN WATER. THE SOLVENT IS EMPLOYED IN AN AMOUNT SUFFICIENT TO ADJUST THE DENSITY DIFFERENTIAL BETWEEN THE POLYETHER-SOLVENT SOLUTION AND WATER TO AT LEAST ABOUT 0.03 GRAM PER MILLILITER. THE POLYETHER-SOLVENT SOLUTION IS THEN SEPARATED FROM THE WATER BY ELECTROSTATIC COALESCENCE. A STREAM OF WATER CONTAINING DISSOLVED THEREIN THE WATER-SOLUBLE IMPURITIES AND A STREAM OF POLYETHER-SOLVENT SOLUTION ARE SEPARATION RECOVERED AFTER THE PRECIPITATION, FOLLWED BY SEPARATING THE SOLVENT FROM THE POLYETHER-SOLVENT SOLUTION.
Inventors
- 👤 Joseph F Louvar
- 👤 Newlin S Nichols
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |