Electrodialytic recovery of acid and insoluble products from spent liquors
Abstract
Abstract A MULTI-CHAMBER ELECTRODIALYTIC APPARATUS AND PROCESS ARE USED TO RECOVER EXCESS FREE ACID AND TO REGENERATE AND CONCENTRATE ACID FROM SPENT LIQUORS, E.G., SPENT PICKLE LIQUORS. SULFURIC ACID AND HYDROCHLORIC ACID ARE RECOVERED AND REGENERATED FROM THE RESPECTIVE IRON AND STEEL PICKLE LIQUORS ALONG WITH OXIDES AND HYDROXIDES OF IRON. EFFICIENCY FOR THE RECOVERY OF THE SULFURIC OR HYDROCHLORIC ACIDS FROM THE SPENT PICKLE LIQUOR IS GREATELY IMPROVED BY USING AN ELECTRODIALYTIC APPARATUS HAVING AN SEQUENCE AN ANODE CHAMBER, AT LEAST ONE CONCENTRATING CHAMBER, A SPENT LIQUOR CHAMBER AND A CATHODE CHAMBER. A SEQUESTRANT IS USED IN THE CATHOLYTE TO PREVENT MEMBRANE FOULING. OTHER VALUES ARE RECOVERED DEPENDING UPON THE MAKEUP OF THE SPENT LIQUORS.
Inventors
- 👤 R Smith
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |