US3766265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of acrylic acid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1972-03-24
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Granted: 1973-10-16
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Expires: 1992-03-24
Abstract
Abstract IN THE PREPARATION OF ACRYLIC ACID BY THE GAS PHASE CATALYTIC OXIDATION OF ACROLEIN WITH MOLECULAR OXYGEN IN THE PRESENCE OF STEAM, A PROCESS WHEREIN THE OXIDATION IS EFFECTED N THE PRESENCE OF A CATALYST COMPOSITION CORRESPONDING TO THE FORMULA: MOA BB(LI2 SO4)COD WHEREIN A, B AND D REPRESENT RESPECTIVELY THE NUMBER OF ATOMS AND C IS THE MOL NUMBER OF LITHIUM SULFATE, AND WHEREIN A IS 12, B IS 0.1 TO 9/0, C IS 0.1 TO 9.0 AND D IS 36.25 TO 58.5. THE CATALYST COMPOSITION HAS A HIGH CATALYTIC ACTIVITY WITH A LONG CATALYTIC LIFE, AND ACRYLIC ACID IS PRODUCED IN AN EXCELLENT YIELD WITH A HIGH PURITY BY THE USE OF SUCH COMPOSITION.
Inventors
- 👤 T Shiraishi
- 👤 S Honmaru
- 👤 Y Nagaoka
- 👤 S Kishiwada
- 👤 S Shimizu
- 👤 K Zinpo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |