Method of regenerating waste pickle liquor
Abstract
Abstract A PROCESS FOR REGENERATING AQUEOUS SULFURIC ACID PICKING LIQUOR THAT CONTAINS RESIDUAL IRON-SULFUR COMPOUNDS CHARACTERIZED BY THE STEPS OF (1) OXIDIZING THE IRON-SULFUR COMPOUNDS IN AT LEAST A PORTION OF THE LIQUOR BY RAISING ITS PH LY NEUTRALIZING THE PORTION OF THE LIQUOR BY RAISING ITS PH TO AT LEAST 2 WITH THE ADDITION OF A SOLUBLE CAUSTIC MATERIAL, PREFERABLY ONE THAT CONTAINS A CATION WHOSE REACTION PRODUCT AFTER THE TWO STEPS FORMS A PECIPITATE AT A PH OF 2 AND HIGHER; (3) SEPARATING THE PRECIPITATES FROM THE REGENERATED PICKLING LIQUOR; AND (4) RETURNING THE REGENERATED PICKLING LIQUOR TO PICKLING SERVICE. ALSO DISCLOSED ARE SPECIFIC PREFERRED MATERIALS AND PROCESSES EMPLOYING ADDITIONAL STEPS.
Inventors
- 👤 W Johnson
- 👤 W Massey
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |