US4035262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrolein oxidation catalyst
Assignee: Dow Chemical Co
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Filing: 1976-04-19
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Granted: 1977-07-12
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Expires: 1996-04-19
Abstract
Abstract A method of preparing acrylic acid by oxidation of acrolein over a new and improved catalyst providing conversions of acrolein of greater than 99% with yields of acrylic acid in excess of 95%. The catalyst consists essentially of the oxides of molybdenum, vanadium, chromium and copper and at least one of tantalum and niobium and optionally silicon on an inert carrier. Catalysts useful in the process contain the elements previously mentioned in the atomic ratios of Mo.sub.15 V.sub.5-10 Cu.sub.2-5 Cr.sub.0.2-2 M.sub.0.1-3 where M is tantalum, niobium or mixtures thereof.
Inventors
- 👤 David L. Childress
- 👤 William V. Hayes
- 👤 Richard L. Poppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:47
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8878; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A supported catalyst suitable for oxidizing acrolein to acrylic acid which contains oxides of molybdenum, vanadium, chromium, copper and at least one of an oxide of tantalum and niobium on an inert support, wherein the atomic ratios of the metals are Mo.sub.15 V.sub.5-10 Cr.sub.0.2-2 Cu.sub.2-5 M.sub.0.1-3 wherein M is tantalum, niobium or mixtures thereof.
Claim 2
Dependent Claim
54 words
A supported catalyst suitable for oxidizing acrolein to acrylic acid which contains oxides of molybdenum, vanadium, chromium, copper and at least one of an oxide of tantalum and niobium on an inert support, wherein the atomic ratios of the metals are Mo.sub.15 V.sub.5-10 Cr.sub.0.2-2 Cu.sub.2-5 M.sub.0.1-3 wherein M is tantalum, niobium or mixtures thereof.
Claim 3
Dependent Claim
20 words
The catalyst of claim 1 which additionally contains silicon as its oxide in the ratio of 1-5 atoms of silicon.
Claim 4
Dependent Claim
18 words
The catalyst of claim 1 wherein the atomic ratios of the metals are Mo.sub.15 V.sub.5-7 Cr.sub.0.7-0.8 Cu.sub.2.4-2.8 M.sub.1.5-2
Claim 5
Dependent Claim
20 words
The catalyst of claim 3 which additionally contains silicon as its oxide in the ratio of 1-3 atoms of silicon.
Claim 6
Dependent Claim
40 words
The catalyst of claim 3 wherein the support is alumina having a surface area of not more than 2 m 2 /g and a porosity of 35-65%, 90% of the pores being in the range of 50-1500 microns in diameter.
References Cited (Backward Citations)
US3853792A
Cited
US3926915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |