US3761516A
Expired / Lapsed
US
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Process for producing unsaturated acids from the corresponding unsaturated aldehydes
Assignee: Halcon Research and Development Corp
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Filing: 1971-09-28
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Granted: 1973-09-25
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Expires: 1991-09-28
Abstract
Abstract A catalyst useful for the oxidation of unsaturated aldehydes, particularly the oxidation of acrolein and methacrolein, to produce the corresponding unsaturated acids, comprises the combination of molybdenum, phosphorus and arsenic on a support or carrier which is characterized by external macro pores. A preferred form of the catalyst further includes a promoter which is aluminum, copper or cobalt.
Inventors
- 👤 S Khoobiar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:06
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: 9
Claim 1
Independent Claim
26 words
A process as defined in claim 1, wherein said catalyst contains a promoter which is selected from the group consisting essentially of aluminum, copper or cobalt.
Claim 2
Dependent Claim
14 words
A process as defined in claim 1, wherein the catalyst carrier is an alumina.
Claim 3
Dependent Claim
15 words
A process as defined in claim 1, wherein the unsaturated aldehyde is acrolein or methacrolein.
Claim 4
Dependent Claim
39 words
A process as defined in claim 1, wherein the arsenic is present in the amount of 0.02 to 1 mol and the phosphorus is present in the amount of 0.04 to 0.5 mol based on 1 mol of molybdenum.
Claim 5
Dependent Claim
83 words
A process for the preparation of methacrylic acid, which comprises oxidizing methacrolein in the vapor-phase with molecular oxygen in the presence of a non-noble metal catalyst consisting essentially of oxides of molybdenum, arsenic, and phosphorus and optionally a promoter selected from the group consisting essentially of aluminum, copper and cobalt disposed upon a support characterized by external macro pores having a diameter of about 1 micron to about 500 microns and having a surface area of at most 2 square meters per gram.
Claim 6
Dependent Claim
142 words
A process for the preparation of an unsaturated acid which comprises oxidizing acrolein Or methacrolein in the vapor phase with molecular oxygen in the presence of a catalyst composition consisting essentially of molybdenum, arsenic, and phosphorus and optionally a promoter selected from the group consisting essentially of aluminum, copper and cobalt, wherein the proportions per molar quantity of molybdenum are 0.04 to 0.5 mol phosphorus, and 0.02 to 1.0 mol arsenic, disposed upon a support characterized by external macro pores and having a surface area of at most 2 square meters per gram, said pores having a diameter of about 1 micron to about 500 microns and extending inwardly from the surface of the support particles for a distance up to about 500 microns, with 10 to 90 percent of the external surface of the support particles being composed of such pores.
Claim 7
Dependent Claim
26 words
A process as defined in claim 7, wherein the catalyst contains a promoter which is selected from the group consisting essentially of aluminum, copper or cobalt.
Claim 8
Dependent Claim
18 words
A process as defined in claim 7, wherein the aldehyde reactant is methacrolein and the promoter is aluminum.
Claim 9
Dependent Claim
12 words
A process as defined in claim 6, wherein the promoter is aluminum.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |