US2526689A
Expired / Lapsed
US
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Process for controlled catalytic oxidation
Assignee: Standard Oil Development Co
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Filing: 1948-07-30
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Granted: 1950-10-24
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Expires: 1968-07-30
Abstract
No abstract record available.
Inventors
- 👤 Walter F Rollman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:49
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/388; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
THE METHOD OF CATALYTICALLY OZIDIZING AN AROMATIC HYDROCARBON TO PRODUCE PHTHALIC ANHYDRIDE, WHICH COMPRISES FLOWING VAPOR OF THE AROMATIC HYDROCARBON AT A CONCENTRATION OF 1.5 TO 2.4 MOL PER CENT IN ADMIXTURE WITH AN OXYGENCONTAINING GAS IN A CONTINUOUS STREAM UP THROUGH A REACTION ZONE, CONCURRENTLY FLOWING IN THE STREAM OF VAPOR AND GAS SUSPENDED VANADIUM OXIDE CATALYST PARTICLES OF ABOUT 20-80 MESH IN THE REACTION ZONE AT A TEMPERATURE IN THE RANGE OF 800*-1100*F. ABRUPTLY SEPARATING THE SUSPENDED CATALYST FROM VAPOR DISCHARGED FROM THE REACTION ZONE, IMMEDIATELY STRIPPING VAPOR FROM
References Cited (Backward Citations)
US2428914A
Cited
US2373008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |