Downflow ion exchange
Abstract
Abstract A CONTINUOUS CYCLIC PROCESS FOR COUNTERCURRENT CONTACT OF A CONTAMINANT CONTAINING LIQUID WITH A SOLID IN A COLUMN LOOP WHICH INCLUDES INTRODUCING THE CONTAMINANT CONTAINING LIQUID INTO THE UPPER PORTION OF ONE SECTION OF THE COLUMN LOOP FOR DOWNWARD FLOW THROUGH THE SOLIDS BED THEREIN TO TRANSFER OR LOAD THE CONTAMINANT ONTO THE SOLIDS. THE SECTION IS POSITIONED ADJACENT THE UPPER END OF THE COLUMN LOOP. LIQUID WITH A REDUCED AMOUNT OF CONTAMINANT IS WITHDRAWN FROM THE LOWER PORTION OF THIS SECTION. A REGENERATING AGENT IS FED TO THE LOWER PORTION OF ANOTHER SECTION OF THE COLUMN LOOP FOR FLOW THROUGH A BED OF SOLIDS LOADED WITH THE CONTAMINANT. THE FLOW OF LIQUID AND REGENERATING AGENT ARE INTERRUPTED AND THE SOLIDS BED IS SHIFTED AROUND THE LOOP AND THE LOADING AND REGENERATING CYCLES ARE THEN REPEATED.
Inventors
- 👤 Irwin R Higgins
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |