US4110369A
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: 1976-10-19
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Granted: 1978-08-29
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Expires: 1996-10-19
Abstract
Abstract Coated catalysts having an inert support material with an outer surface and a coating of active catalyst containing molybdenum, phosphorus, arsenic, copper and oxygen have been found to be especially effective catalysts for the production of unsaturated acids from the corresponding unsaturated aldehydes, for example, methacrolein is oxidized to methacrylic acid using these catalysts. The catalysts give a very low exotherm, very high single pass yields of the desired acid and reduce the undesirable byproducts.
Inventors
- 👤 James F. White
- 👤 Wilfrid G. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:09
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
156 words
In the process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or methacrolein in the vapor phase with molecular oxygen in the presence of an oxide or oxide complex active catalyst of the formula Mo.sub.12 P.sub.b As.sub.c Cu.sub.d O.sub.f wherein b, c and d are numbers from 0.001 to 10; f is the number of oxygens required by the valence states of the other elements present, at an elevated temperature of about 200° to about 500° C., the improvement comprising: using a coated catalyst consisting 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 on said inert support strongly adhering to the outer surface of said support wherein said coated catalyst is prepared by partially wetting the support with water and rolling the partially wet support in a powder of the active catalyst.
Claim 2
Dependent Claim
156 words
In the process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or methacrolein in the vapor phase with molecular oxygen in the presence of an oxide or oxide complex active catalyst of the formula Mo.sub.12 P.sub.b As.sub.c Cu.sub.d O.sub.f wherein b, c and d are numbers from 0.001 to 10; f is the number of oxygens required by the valence states of the other elements present, at an elevated temperature of about 200° to about 500° C., the improvement comprising: using a coated catalyst consisting 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 on said inert support strongly adhering to the outer surface of said support wherein said coated catalyst is prepared by partially wetting the support with water and rolling the partially wet support in a powder of the active catalyst.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the active catalyst is about 10 to about 100 percent by weight of the inert support.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the inert support is selected from the group consisting of silica, Alundum, alumina, alumina-silica, silicon carbide, titania and zirconia.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the catalyst is calcined at a temperature of 325° C to 425° C.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the reaction temperature is 250°-370° C.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein b is 0.01 to 5.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein c is 0.01 to 5.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein d is 0.001 to 5.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein b is 0.5 to 1.5, c is 0.1 to 1.0 and d is 0.1 to 1.0.
Claim 11
Dependent Claim
21 words
The process of claim 1 wherein the inert support has a particle size of about 0.2 cm. to about 2 cm.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein the catalyst employed is 25%Mo 12 P 1 .0 As 0 .5 Cu 0 .25 O f + 75% Alundum.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein the oxidation is carried out in the presence of steam.
Claim 14
Dependent Claim
9 words
The process of claim 1 wherein methacrolein is reacted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |