US2801272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering polymethyl aromatic compounds containing paramethyl groupings y fractional crystallization in the presence of chloral
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-09-30
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Granted: 1957-07-30
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Expires: 1975-09-30
Abstract
No abstract record available.
Inventors
- 👤 Delos E Bown
- 👤 Winfred O Milligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:32
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR THE RECOVERY OF A C8 TO C10 POLYMETHYL BENZENE CONTAINING A PARAMETHYL GROUPING FROM A FEED STOCK COMPRISING A MIXTURE OF AROMATIC HYDROCARBON COMPOUNDS CONTAINING SAID PARAMETHYL AROMATIC COMPOUND WHICH COMPRISES THE STEPS OF MIXING SAID FEED STOCK WITH ABOUT 60 TO 100 VOLUME PERCENT OF CHLORAL, CHIL RESULTANT MIXTURE TO ABOUT THE LOWERMOST TEMPERATURE OF SELECTIVE CRYSTALLIZATION OF SAID PARAMETHYL AROMATIC COMPOUND TO BE USED TO FORM A SLURRY OF CHLORALPARAMETHYL AROMATIC CO-CRYSTALLIZED SOLID IN A MOTHER LIQUOR CONTAINING UNCRYSTALLIZED CHLORAL AND UNCRYSTALLIZED PARAMETHYL AROMATIC COMPOUND, FILTERING SAID SLURRY TO OBTAIN A FILTRATE FRACTION AND A FILTER CAKE FRACTOR, AND REMOVING CHLORAL FROM SAID FILTER CAKE FRACTION.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE RECOVERY OF A C8 TO C10 POLYMETHYL BENZENE CONTAINING A PARAMETHYL GROUPING FROM A FEED STOCK COMPRISING A MIXTURE OF AROMATIC HYDROCARBON COMPOUNDS CONTAINING SAID PARAMETHYL AROMATIC COMPOUND WHICH COMPRISES THE STEPS OF MIXING SAID FEED STOCK WITH ABOUT 60 TO 100 VOLUME PERCENT OF CHLORAL, CHIL RESULTANT MIXTURE TO ABOUT THE LOWERMOST TEMPERATURE OF SELECTIVE CRYSTALLIZATION OF SAID PARAMETHYL AROMATIC COMPOUND TO BE USED TO FORM A SLURRY OF CHLORALPARAMETHYL AROMATIC CO-CRYSTALLIZED SOLID IN A MOTHER LIQUOR CONTAINING UNCRYSTALLIZED CHLORAL AND UNCRYSTALLIZED PARAMETHYL AROMATIC COMPOUND, FILTERING SAID SLURRY TO OBTAIN A FILTRATE FRACTION AND A FILTER CAKE FRACTOR, AND REMOVING CHLORAL FROM SAID FILTER CAKE FRACTION.
References Cited (Backward Citations)
GB677368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |