US2679537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposal of waste caustic solution by treatment with spent pickle liquor
Assignee: Standard Oil Co
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Filing: 1952-11-15
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Granted: 1954-05-25
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Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 Richard E Knowlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:08
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/66; C10; C10G; C10G19/00; C10G19/08; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS OF TREATING A SPENT CAUSTIC REFINERY WASTE LIQUOR COMPRISING SULFUR COMPOUNDS AND CRESYLIC ACIDS AND A SPENT PICKLE LIQUOR PRODUCED IN SULFURIC ACID PICKLE OF FERROUS METAL COMPRISING AN IRON SULFATE AND SULFURIC ACID, TO DISPOSE OF BOTH SAID WASTE PRODUCTS, WHICH COMPRISES MIXING (1) SAID SPENT REFINERY CAUSTIC WASTE LIQUOR AND (2) SPENT PICKLE LIQUOR IN PROPORTIONS TO PRODUCE (3) A RESULTING SOLUTION HAVING A PH OF FROM ABOVE ABOUT 6.0 TO 11.5 TO FORM A PRECIPITATE, SEPARATING THE PRECIPITATE, AND ACIDIFYING THE REMAINING LIQUOR TO A PH OF 3 TO LESS THAN 6.0 TO SEPARATE THE CRESYLIC ACIDS THEREFROM.
Claim 2
Dependent Claim
103 words
A PROCESS OF TREATING A SPENT CAUSTIC REFINERY WASTE LIQUOR COMPRISING SULFUR COMPOUNDS AND CRESYLIC ACIDS AND A SPENT PICKLE LIQUOR PRODUCED IN SULFURIC ACID PICKLE OF FERROUS METAL COMPRISING AN IRON SULFATE AND SULFURIC ACID, TO DISPOSE OF BOTH SAID WASTE PRODUCTS, WHICH COMPRISES MIXING (1) SAID SPENT REFINERY CAUSTIC WASTE LIQUOR AND (2) SPENT PICKLE LIQUOR IN PROPORTIONS TO PRODUCE (3) A RESULTING SOLUTION HAVING A PH OF FROM ABOVE ABOUT 6.0 TO 11.5 TO FORM A PRECIPITATE, SEPARATING THE PRECIPITATE, AND ACIDIFYING THE REMAINING LIQUOR TO A PH OF 3 TO LESS THAN 6.0 TO SEPARATE THE CRESYLIC ACIDS THEREFROM.
References 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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |