US3412168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering monomethylnaphthalenes
Assignee: United States Steel Corp
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Filing: 1965-10-22
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Granted: 1968-11-19
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Philip X Masciantonio
- 👤 Francis P Mullooly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:41
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/005; C07C7/17; C07C7/171; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/06; C10G31/00; C10G7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
A METHOD OF RECOVERING A HIGH-PURITY MONOMETHYLNAPHTHALENES FRACTION FROM A FRACTION HAVING A NOMINAL BOILING RANGE OF 230*-270*C. COMPRISING TREATING SAID FRACTION AT A TEMPERATURE BETWEEN 10* AND 80* C. WITH SULFURIC ACID HAVING A CONCENTRATION BETWEEN ABOUT 10% AND 50%, THE MOLE RATIO OF ACID TO BASES IN SAID FRACTION BEING BETWEEN ABOUT 0.5 AND 2.0 OF ACID TO 1 OF BASES, SEPARATING SAID FRACTION FROM AN ACID LAYER, TREATING SAID FRACTION AT A TEMPERATURE BETWEEN ABOUT 150* AND 190* C. WITH AT LEAST ABOUT 3% BY WEIGHT OF SAID FRACTION OF SULFURIC ACID HAVING A CONCENTRATION BETWEEN ABOUT 90% AND 100% UNTIL A FRIABLE RESIN IS FORMED, FILTERING TO SEPARATE SAID FRACTION AND RESIN, TREATNG SAID FRACTION WITH ABOUT 10% TO 25% BY WEIGHT OF A 10% TO 50% AQUEOUS CAUSTIC SOLUTION, SEPARATING SAID FRACTION FROM A CAUSTIC LAYER, TREATING SAID FRACTION WITH A VOLUME OF WATER AT LEAST ABOUT 10% OF THE VOLUME OF SAID FRACTION, SEPARATING SAID FRACTION FROM A WATER LAYER, FRACTIONATING SAID FRACTION AND COLLECTING A DISTILLATE COMPRISING A SAID MONOMETHYLNAPHTHALENES FRACTION HAVING A BOILING RANGE OF 235* TO 247*C.
Claim 2
Independent Claim
186 words
A METHOD OF RECOVERING A HIGH-PURITY MONOMETHYLNAPHTHALENES FRACTION FROM A FRACTION HAVING A NOMINAL BOILING RANGE OF 230*-270*C. COMPRISING TREATING SAID FRACTION AT A TEMPERATURE BETWEEN 10* AND 80* C. WITH SULFURIC ACID HAVING A CONCENTRATION BETWEEN ABOUT 10% AND 50%, THE MOLE RATIO OF ACID TO BASES IN SAID FRACTION BEING BETWEEN ABOUT 0.5 AND 2.0 OF ACID TO 1 OF BASES, SEPARATING SAID FRACTION FROM AN ACID LAYER, TREATING SAID FRACTION AT A TEMPERATURE BETWEEN ABOUT 150* AND 190* C. WITH AT LEAST ABOUT 3% BY WEIGHT OF SAID FRACTION OF SULFURIC ACID HAVING A CONCENTRATION BETWEEN ABOUT 90% AND 100% UNTIL A FRIABLE RESIN IS FORMED, FILTERING TO SEPARATE SAID FRACTION AND RESIN, TREATNG SAID FRACTION WITH ABOUT 10% TO 25% BY WEIGHT OF A 10% TO 50% AQUEOUS CAUSTIC SOLUTION, SEPARATING SAID FRACTION FROM A CAUSTIC LAYER, TREATING SAID FRACTION WITH A VOLUME OF WATER AT LEAST ABOUT 10% OF THE VOLUME OF SAID FRACTION, SEPARATING SAID FRACTION FROM A WATER LAYER, FRACTIONATING SAID FRACTION AND COLLECTING A DISTILLATE COMPRISING A SAID MONOMETHYLNAPHTHALENES FRACTION HAVING A BOILING RANGE OF 235* TO 247*C.
References Cited (Backward Citations)
US2920121A
Cited
US3116341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |