US3261846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of trimellitic acid product
Assignee: Standard Oil Co
•
Filing: 1961-06-30
•
Granted: 1966-07-19
•
Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Delbert H Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:39
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN THE PREPARATION OF TRIMELLITIC ACID PRODUCT SELECTED FROM THE CLASS CONSISTING OF TRIMELLITIC ACID AND THE INTRA-MOLECULAR ANHYDRIDE OF TRIMELLITIC ACID RESULTING FROM THE CATALYTIC LIQUID PHASE OXIDATION OF PSUEDOCUMENE WITH MOLECULAR OXYGEN IN THE PRESENCE OF ACETIC ACID AS REACTION MEDIUM AT ELEVATED TEMPERATURE AND ELAVATED PRESSURE IN AN OXIDATION ZONE TO PRODUCE TRIMELLITIC ACID, THE RECOVERY OF TRIMELLITIC ACID PRODUCT WHICH CONSISTS OF COMBINING THE TOTAL FLUID EFFLUENT CONTAINING TRIMELLITIC ACID FROM SAID OXIDATION ZONE WITH PSFUDOCUMENE IN AN AMOUNT IN THE RANGE OF FROM 0.2 TO 10 PARTS PER PART OF TOTAL SOLIDS BY WEIGHT IN SAID TOTAL DFFLUENT; DISTILLING THE RESULTING MIXTURE TO RECOVER (A) AN AZEOTROPIC MIXTURE CONTAINING AN AQUEOUS ACETIC ACID PHASE AND A PSUEDOCUMENE PHASE, (B) DEHYDRATED ACETIC ACID AND (C) SAID TRIMELLITIC ACID PRODUCT AS RESIDUE.
Claim 2
Dependent Claim
135 words
IN THE PREPARATION OF TRIMELLITIC ACID PRODUCT SELECTED FROM THE CLASS CONSISTING OF TRIMELLITIC ACID AND THE INTRA-MOLECULAR ANHYDRIDE OF TRIMELLITIC ACID RESULTING FROM THE CATALYTIC LIQUID PHASE OXIDATION OF PSUEDOCUMENE WITH MOLECULAR OXYGEN IN THE PRESENCE OF ACETIC ACID AS REACTION MEDIUM AT ELEVATED TEMPERATURE AND ELAVATED PRESSURE IN AN OXIDATION ZONE TO PRODUCE TRIMELLITIC ACID, THE RECOVERY OF TRIMELLITIC ACID PRODUCT WHICH CONSISTS OF COMBINING THE TOTAL FLUID EFFLUENT CONTAINING TRIMELLITIC ACID FROM SAID OXIDATION ZONE WITH PSFUDOCUMENE IN AN AMOUNT IN THE RANGE OF FROM 0.2 TO 10 PARTS PER PART OF TOTAL SOLIDS BY WEIGHT IN SAID TOTAL DFFLUENT; DISTILLING THE RESULTING MIXTURE TO RECOVER (A) AN AZEOTROPIC MIXTURE CONTAINING AN AQUEOUS ACETIC ACID PHASE AND A PSUEDOCUMENE PHASE, (B) DEHYDRATED ACETIC ACID AND (C) SAID TRIMELLITIC ACID PRODUCT AS RESIDUE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |