US3867345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the oxidizing alpha, beta-unsaturated aldehydes to alpha, beta-unsaturated carboxylic acids
Assignee: Evonik Operations GmbH
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Filing: 1972-09-27
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Granted: 1975-02-18
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Expires: 1992-09-27
Abstract
Abstract Alpha , Beta -unsaturated aldehydes are oxidized to Alpha , Beta -unsaturated carboxylic acids by contacting the Alpha , Beta -unsaturated aldehyde with air or oxygen and steam at 200*350*C and at atmospheric or elevated pressure in the presence of a catalyst so as to convert the aldehyde to the corresponding carboxylic acid. The catalyst comprises a mixture of oxides of the elements antimony, molybdenum, vanadium and tungsten and/or compounds of said elements and oxygen wherein the atomic ratio of the elements is as follows: 1 to 60 : 12 : 0.5 to 25 : 0.1 to 12. The catalyst is made by intimately mixing under agitation aqueous solutions or suspensions of the oxides or other compounds, for instance antimony oxide, ammonium molybdate, ammonium vanadate and ammonium tungstate, and possibly a carrier material and preferably bringing the mixture to boiling point, then separating the catalyst mass from the aqueous phase, drying it and calcining it at 225*-275*C, followed by heating in air for 15-60 minutes at 350*-475*C.
Inventors
- 👤 Edgar Koberstein
- 👤 Theodor Luessling
- 👤 Ewald Noll
- 👤 Hans Schaefer
- 👤 Wolfgang Weigert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; B01J23/28; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
A PROCESS FOR THE PRODUCTION OF AN UNSATURATED ALIPHATIC CARBOXYLIC ACID OF THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID WHICH COMPRISES PASSING A MIXTURE OF AIR OR OTHER GAS CONTAINING MOLECULAR OXYGEN, STEAM, AND AN UNSATURATED ALIPHATIC ALDEHYDE OF THE GROUP CONSISTING OF ACROLEIN FOR THE PRODUCTIOIN OF ACRYLIC ACID, AND METHACROLEIN FOR THE PRODUCTION OF METHACRYLIC ACID, INTO CONTACT AT A TEMPERATURE BETWEEN 200*C AND 350*C AND AT A PRESSURE BETWEEN ATMOSPHERIC AND A SUPERATMOSPHERIC PRESSURE OF 3 ATOMOSPHERES WITH A CATALYST CONSISTING ESSENTIALLY OF OXIDES OR OXYGENCONTAINING COMPOUNDS OF THE ELEMENTS ANTIMONY, MOLYBDENUM, VANADIUM, AND TUNGSTEN, SUPPORTED ON A CARRIER MATERIAL, THE ATOMIC RATIOS OF THE ELEMENTS OF THE CATALYST WITH RESPECT TO MOLYBDENUM BEING RESPECTIVELY BETWEEN 1: 12 AND 60: 12 FOR ANTIMONY, BETWEEN 0.5 : 12 AND 25 FOR VANADIUM, AND BETWEEN 0.1 : 12 AND 12 : 12 FOR TUNGSTEN, AND SUBSEQUENTLY RECOVERING THE ACRYLIC ACID OR METHACRYLIC ACID FROM THE RESULTING MIXTURE.
Claim 2
Dependent Claim
160 words
A PROCESS FOR THE PRODUCTION OF AN UNSATURATED ALIPHATIC CARBOXYLIC ACID OF THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID WHICH COMPRISES PASSING A MIXTURE OF AIR OR OTHER GAS CONTAINING MOLECULAR OXYGEN, STEAM, AND AN UNSATURATED ALIPHATIC ALDEHYDE OF THE GROUP CONSISTING OF ACROLEIN FOR THE PRODUCTIOIN OF ACRYLIC ACID, AND METHACROLEIN FOR THE PRODUCTION OF METHACRYLIC ACID, INTO CONTACT AT A TEMPERATURE BETWEEN 200*C AND 350*C AND AT A PRESSURE BETWEEN ATMOSPHERIC AND A SUPERATMOSPHERIC PRESSURE OF 3 ATOMOSPHERES WITH A CATALYST CONSISTING ESSENTIALLY OF OXIDES OR OXYGENCONTAINING COMPOUNDS OF THE ELEMENTS ANTIMONY, MOLYBDENUM, VANADIUM, AND TUNGSTEN, SUPPORTED ON A CARRIER MATERIAL, THE ATOMIC RATIOS OF THE ELEMENTS OF THE CATALYST WITH RESPECT TO MOLYBDENUM BEING RESPECTIVELY BETWEEN 1: 12 AND 60: 12 FOR ANTIMONY, BETWEEN 0.5 : 12 AND 25 FOR VANADIUM, AND BETWEEN 0.1 : 12 AND 12 : 12 FOR TUNGSTEN, AND SUBSEQUENTLY RECOVERING THE ACRYLIC ACID OR METHACRYLIC ACID FROM THE RESULTING MIXTURE.
Claim 3
Dependent Claim
54 words
A process as defined in claim 1 in which the atomic ratios of the elements in the catalyst with respect to molybdenum are between 3 : 12 and 40 : 12 for antimony, between 1 : 12 and 12 : 12 for vanadium, and between 0.1 : 12 and 6.6 : 12 for tungsten.
Claim 4
Dependent Claim
54 words
A process as defined in claim 1 in which the atomic ratios of the elements in the catalyst with respect to molybdenum are between 3 : 12 and 5 : 12 for antimony, between 1 : 12 and 8 : 12 for vanadium, and between 0.5 : 12 and 3 : 12 for tungsten.
Claim 5
Dependent Claim
94 words
A process as defined in claim 1 in which the catalyst was prepared by a process comprising adding antimony oxide that had been heated together with nitric acid to a soluTion of a molybdenum salt in water, thereafter adding the carrier material, a solution of a vanadium salt and a dispersion of a tungsten salt, to the said mixture and intimately mixing the same, drying the mixture and calcining it in air at a temperature between 225* and 275*C, and subsequently heating the calcined mixture in air at a temperature between 350* and 475*C.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the aldehyde is acrolein and the acid obtained is acrylic acid.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein the aldehyde is methacrolein and the acid obtained is methacrylic acid.
Claim 8
Dependent Claim
27 words
A process as defined in claim 1 in which the carrier material is highly dispersed silicon dioxide or a mixture of highly dispersed silicon dioxide and montmorillonite.
Claim 9
Dependent Claim
55 words
A process as defined in claim 1 in which the oxygen-containing gas is air and the aldehyde is acrolein and the molecular ratio of the mixture that is passed into contact with the catalyst is 1 mol of aldehyde to between 2.5 and 30 mols of air and between 2 and 20 mols of steam.
Claim 10
Dependent Claim
36 words
A process as defined in claim 8 in which the molecular ratio of the mixture is 1 mol of aldehyde to between 2.5 and 10 mols of air and between 5 and 10 mols of steam.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |