US2768222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of xylenes with antimony trichloride
Assignee: Shell Development Co
•
Filing: 1950-03-31
•
Granted: 1956-10-23
•
Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 Alan C Nixon
- 👤 Jr Carl H Deal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:18
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING ESSENTIALLY PURE PARA-XYLENE FROM A MIXTURE CONSISTING ESSENTIALLY OF 20-50 PARTS BY WEIGHT OF PARA-XYLENE AND 80-50 PARTS BY WEIGHT OF META-XYLENE WHICH COMPRISES FORMING A LIQUID SOLUTION BY MIXING SAID MIXTURE AT AN ELEVATED TEMPERATURE WITH A SUBSTANTIAL PROPORTION OF ANTIMONY TRICHLORIDE TO PRODUCE A RESULTING MIXTURE FROM WHICH A SOLID PHASE COMPLEX CONTAINING ONLY ANTIMONY TRICHLORIDE AND PARA-XYLENE IS FIRST PRODUCED ON COOLING, COOLING THE RESULTING MIXTURE UNTIL A EUTECTIC LIQUID PHASE AND A SOLID COMPLEX OF PARAXYLENE WITH ANTIMONY TRICHLORIDE IS FORMED, SEPARATING THE SOLID COMPLEX FROM THE EUTECTIC LIQUID AND RECOVERING PURE PARA-XYLENE FROM THE SEPARATED COMPLEX.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING ESSENTIALLY PURE PARA-XYLENE FROM A MIXTURE CONSISTING ESSENTIALLY OF 20-50 PARTS BY WEIGHT OF PARA-XYLENE AND 80-50 PARTS BY WEIGHT OF META-XYLENE WHICH COMPRISES FORMING A LIQUID SOLUTION BY MIXING SAID MIXTURE AT AN ELEVATED TEMPERATURE WITH A SUBSTANTIAL PROPORTION OF ANTIMONY TRICHLORIDE TO PRODUCE A RESULTING MIXTURE FROM WHICH A SOLID PHASE COMPLEX CONTAINING ONLY ANTIMONY TRICHLORIDE AND PARA-XYLENE IS FIRST PRODUCED ON COOLING, COOLING THE RESULTING MIXTURE UNTIL A EUTECTIC LIQUID PHASE AND A SOLID COMPLEX OF PARAXYLENE WITH ANTIMONY TRICHLORIDE IS FORMED, SEPARATING THE SOLID COMPLEX FROM THE EUTECTIC LIQUID AND RECOVERING PURE PARA-XYLENE FROM THE SEPARATED COMPLEX.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |