US4072708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of unsaturated acids from unsaturated aldehydes
Assignee: Standard Oil Co
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Filing: 1977-01-31
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Granted: 1978-02-07
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Expires: 1997-01-31
Abstract
Abstract Methacrylic acid or acrylic acid are produced by the oxidation of methacrolein or acrolein, respectively, with molecular oxygen in the vapor phase in the presence of a catalytic oxide of molybdenum, phosphorus, arsenic, a rare earth element or mixture thereof, oxygen, and optionally, at least one of Ag, Tl, Rh, Pd, Ru, Pt, Cd, Al, Au, Cu, alkaline earth metal, Cl, and NH 4 .
Inventors
- 👤 James F. White
- 👤 Wilfrid G. Shaw
- 👤 Michael D. Applequist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8872; B01J23/16; B01J23/24; B01J23/28; B01J23/38; B01J23/54; B01J23/8871; B01J23/8876; B01J23/89; B01J23/8933; B01J23/8993; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
143 words
In the process for the production of acrylic acid and methacrylic acid by the oxidation of acrolein and methacrolein respectively, with molecular oxygen in the vapor phase at a reaction temperature of about 200° C to about 500° C. in the presence of a catalyst, and optionally in the presence of steam, the improvement comprising using as a catalyst a catalyst of the formula X.sub.a Y.sub.b Mo.sub.12 P.sub.c As.sub.d O.sub.x wherein X is a rare earth element or a mixture thereof; Y is at least one of Ag, Tl, Rh, Pd, Ru, Pt, Cd, Al, Au, Cu, alkaline earth metal, Cl, and NH 4 ; wherein a is 0.001 to 10; b is 0 to 10; c is 0.01 to 5; d is 0.01 to 5; x is the number of oxygens required to satisfy the valence states of the other elements present.
Claim 2
Dependent Claim
143 words
In the process for the production of acrylic acid and methacrylic acid by the oxidation of acrolein and methacrolein respectively, with molecular oxygen in the vapor phase at a reaction temperature of about 200° C to about 500° C. in the presence of a catalyst, and optionally in the presence of steam, the improvement comprising using as a catalyst a catalyst of the formula X.sub.a Y.sub.b Mo.sub.12 P.sub.c As.sub.d O.sub.x wherein X is a rare earth element or a mixture thereof; Y is at least one of Ag, Tl, Rh, Pd, Ru, Pt, Cd, Al, Au, Cu, alkaline earth metal, Cl, and NH 4 ; wherein a is 0.001 to 10; b is 0 to 10; c is 0.01 to 5; d is 0.01 to 5; x is the number of oxygens required to satisfy the valence states of the other elements present.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein X is cerium, erbium, or a mixture of rare earth elements consisting essentially of Ce, La, Nd, and Pr.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein X is a mixture of rare earth elements consisting essentially of Ce, La, Nd and Pr.
Claim 5
Dependent Claim
9 words
The process of claim 1 wherein X is cerium.
Claim 6
Dependent Claim
9 words
The process of claim 1 wherein X is erbium.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein Y is at least one of silver, thallium and copper.
Claim 8
Dependent Claim
9 words
The process of claim 1 wherein Y is silver.
Claim 9
Dependent Claim
9 words
The process of claim 1 wherein Y is thallium.
Claim 10
Dependent Claim
9 words
The process of claim 1 wherein Y is copper.
Claim 11
Dependent Claim
9 words
The process of claim 1 wherein b is zero.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein a is 0.001 to 3.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein b is 0.001 to 3.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein the active catalytic material is coated on an inert support.
Claim 15
Dependent Claim
44 words
The process of claim 13 wherein the catalyst consists essentially of an inert support material having a diameter of at least 20 microns and an outer surface and a continuous coating of said active catalyst strongly adhering to the outer surface of said support.
Claim 16
Dependent Claim
22 words
The process of claim 14 wherein the active catalyst is about 10 to about 100 percent by weight of the inert support.
Claim 17
Dependent Claim
23 words
The process of claim 14 wherein the support is selected from the group consisting of silica, alumina, alumina-silica, silicon carbide, titania and zirconia.
Claim 18
Dependent Claim
19 words
The process of claim 14 wherein the particle size of the inert support is 0.2 cm. to 2 cm.
Claim 19
Dependent Claim
12 words
The process of claim 1 wherein methacrylic acid is prepared from methacrolein.
References Cited (Backward Citations)
US3686294A
Cited
US3761516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |