US3575952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tall oil recovery
Assignee: SCM Corp
•
Filing: 1969-10-02
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Granted: 1971-04-20
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Expires: 1989-10-02
Abstract
Abstract A PROCESS FOR REMOVING LIGNIN SALTS FROM CRUDE TALL OIL SOAP SKIMMINGS IS DISCLOSED. THE SOAP SKIMMINGS ARE WASHED OR EXTRACTED WITH AN AQUEOUS SALT SOLUTION. IN THE PREFERRED EMBODIMENT THE SALT SOLUTION IS THE AQUEOUSALKALIZED "SPENT ACID" FROM THE CRUDE TALL OIL ACIDULATION REACTION. THIS EXTRACTION REDUCES THE LIGNIN CONCENTRATION IN THE LIGNIN CONCENTRATION IN THE SOAP SKIMMING PHASE AND THEREBY PROMOTES A BETTER YIELD AND BETTER QUALITY OF CRUDE TALL OIL UPON ACIDULATION. A VISCOSITY CONTROLLED PHASE SEPARATION TECHNIQUE IS EMPLOYED IN SEPARATING THE VISCOUS SOAP SKIMMINGS FROM THE LESS VISCOUS AQUEOUS WASHING LIQUORS.
Inventors
- 👤 Charles W Morris
- 👤 Gerald S Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:35
CPC Classifications
C; C09; C09F; C09F1/00; C09F1/02
Claims Analysis
Total Claims: 0
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |