Patent US2724007A successfully refreshed from Google Patents.
US2724007A
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Para xylene separation process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-07-30
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Granted: 1955-11-15
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Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 Bruce R Tegge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:34
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D11/00; B01D11/02; B01D11/028; B01D11/0284; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN A PROCESS FOR SEPARATING PARA XYLENE FROM A NORMALLY LIQUID PREDOMINANTLY AROMATIC HYDROCARBON FEED BOILING IN THE RANGE OF 130* TO 160*C. WHEREIN THE AROMATIC FEED IS CHILLED TO A CRYSTALLIZATION TEMPERATURE BETWEEN ONLY -40* TO 90*C. TO CRYSTALLIZE SUBSTANTIALLY ONLY THE PARA XYLENE AND THE RESULTING PARA XYLENE CRYSTALS ARE MECHANICALLY SEPARATED FROM CHILLED MOTHER LIQUOR, THE IMPROVEMENT WHICH COMPRISES PLACING THE SEPARATED PARA XYLENE CRYSTALS SUBSTANTIALLY AT SAID CRYSTALLIZATION TEMPERATURE IN A CRYSTAL WASHING ZONE, WASHING SAID CRYSTALS IN SAID WASHING ZONE WITH ABOUT 10 TO 100 PARTS (PER 100 PARTS OF PARA XYLENE CRYSTALS) OF AN AQUEOUS
Claim 2
Dependent Claim
101 words
IN A PROCESS FOR SEPARATING PARA XYLENE FROM A NORMALLY LIQUID PREDOMINANTLY AROMATIC HYDROCARBON FEED BOILING IN THE RANGE OF 130* TO 160*C. WHEREIN THE AROMATIC FEED IS CHILLED TO A CRYSTALLIZATION TEMPERATURE BETWEEN ONLY -40* TO 90*C. TO CRYSTALLIZE SUBSTANTIALLY ONLY THE PARA XYLENE AND THE RESULTING PARA XYLENE CRYSTALS ARE MECHANICALLY SEPARATED FROM CHILLED MOTHER LIQUOR, THE IMPROVEMENT WHICH COMPRISES PLACING THE SEPARATED PARA XYLENE CRYSTALS SUBSTANTIALLY AT SAID CRYSTALLIZATION TEMPERATURE IN A CRYSTAL WASHING ZONE, WASHING SAID CRYSTALS IN SAID WASHING ZONE WITH ABOUT 10 TO 100 PARTS (PER 100 PARTS OF PARA XYLENE CRYSTALS) OF AN AQUEOUS
References Cited (Backward Citations)
US2615058A
Cited
US2541682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |