US3020312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying phthalic acids
Assignee: Sunoco Inc
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Filing: 1958-01-13
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Granted: 1962-02-06
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Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Moscrip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN A PROCESS FOR PRODUCING ISOPHTHALIC ACID WHEREIN M-XYLENE IS PARTIALLY OXIDIZED IN LIQUID PHASE TO OBTAIN A REACTION PRODUCT COMPRISING SOLID ISOPHTALIC ACID, UNOXIDIZED LIQUID M-XYLENE AND CONTAMINATING COLOR BODIES, AND WHEREIN A SOLID MATERIAL COMPRISING SOLID ISOPHTHALIC ACID, OCCLUDED LIQUID M-XYLENE AND CONTAMINATING COLOR BODIES IS SEPARATED FROM THE FREE LIQUID IN SAID REACTION PRODUCT AND SUBSEQUENTLY CONTACTED WITH AN AQUEOUS LOWER ALKANOL THEREBY TO PRODUCE A SOLUTION OF THE ISOPHTHALIC ACID IN SAID AQUEOUS ALKANOL, SAID SOLUTION ALSO CONTAINING THE OCCULDED UNOXIDIZED XYLENE AND CONTAMINATING COLOR BODIES, THE IMPROVEMENT OF: (1) SEPARATELY CONTACTING SAID SOLUTION, AT A TEMPERATURE IN THE APPROXIMATE RANGE OF FROM ABOUT 50 TO ABOUT 300*F., WITH AN ADDED AGENT SELECTED FROM THE GROUP CONSISTING OF WATER, AND BOTH WATER AND XYLENE, IN AMOUNT SUFFICIENT TO PRODUCE A TWO-PHASE LIWUID SYSTEM; AND (2) SEPARATING FROM THE RESULTING TWO-PHASE LIQUID SYSTEM A XYLENE-RICH LAYER CONTAINING COLOR BODIES, WHEREBY AN AQUEOUS-ALKANOL-RICH SOLUTION OF ISOPHTHALIC ACID CONTINING REDUCED CONCENTRATIONS OF XYLENE AND COLOR BODIES IS OBTAINED
Claim 2
Dependent Claim
169 words
IN A PROCESS FOR PRODUCING ISOPHTHALIC ACID WHEREIN M-XYLENE IS PARTIALLY OXIDIZED IN LIQUID PHASE TO OBTAIN A REACTION PRODUCT COMPRISING SOLID ISOPHTALIC ACID, UNOXIDIZED LIQUID M-XYLENE AND CONTAMINATING COLOR BODIES, AND WHEREIN A SOLID MATERIAL COMPRISING SOLID ISOPHTHALIC ACID, OCCLUDED LIQUID M-XYLENE AND CONTAMINATING COLOR BODIES IS SEPARATED FROM THE FREE LIQUID IN SAID REACTION PRODUCT AND SUBSEQUENTLY CONTACTED WITH AN AQUEOUS LOWER ALKANOL THEREBY TO PRODUCE A SOLUTION OF THE ISOPHTHALIC ACID IN SAID AQUEOUS ALKANOL, SAID SOLUTION ALSO CONTAINING THE OCCULDED UNOXIDIZED XYLENE AND CONTAMINATING COLOR BODIES, THE IMPROVEMENT OF: (1) SEPARATELY CONTACTING SAID SOLUTION, AT A TEMPERATURE IN THE APPROXIMATE RANGE OF FROM ABOUT 50 TO ABOUT 300*F., WITH AN ADDED AGENT SELECTED FROM THE GROUP CONSISTING OF WATER, AND BOTH WATER AND XYLENE, IN AMOUNT SUFFICIENT TO PRODUCE A TWO-PHASE LIWUID SYSTEM; AND (2) SEPARATING FROM THE RESULTING TWO-PHASE LIQUID SYSTEM A XYLENE-RICH LAYER CONTAINING COLOR BODIES, WHEREBY AN AQUEOUS-ALKANOL-RICH SOLUTION OF ISOPHTHALIC ACID CONTINING REDUCED CONCENTRATIONS OF XYLENE AND COLOR BODIES IS OBTAINED
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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |