US3925464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing unsaturated carboxylic acids from the corresponding unsaturated aldehydes
Assignee: AGC Inc
•
Filing: 1972-12-12
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Granted: 1975-12-09
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Expires: 1992-12-12
Abstract
Abstract A process for preparing unsaturated carboxylic acids which comprises reacting the corresponding unsaturated aldehydes with molecular oxygen in the presence of a catalyst consisting essentially of (a) molybdenum, (b) phosphorous, (c) at least one element selected from the group consisting of tungsten and magnesium, (d) at least one element selected from the group consisting of vanadium and bismuth, and (e) oxygen.
Inventors
- 👤 Yoshio Oda
- 👤 Keiichi Uchida
- 👤 Manabu Suhara
- 👤 Takeshi Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:24
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J23/00; B01J23/16; B01J23/24; B01J23/28; B01J23/30; B01J23/31; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
102 words
THE PROCESS FOR PREPARING ACRYLIC ACID OR METHACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHACROLEIN WITH MOLECULAR OXYGEN IN THE VAPOR PHASE AT A TEMPERATURE FROM 250* TO 450*C, IN THE PRESENCE OF A CATALYST HAVING THE EMPIRICAL FORMULA: MO12-PA-XB-YY-OG WHEREIN X IS AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN AND MAGNESIUM; Y IS AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF VANADIUM AND BISMUTH; A IS A NUMBER FROM 0.1 TO 5; B IS A NUMBER 0.1 TO 10;Y IS A NUMBER FROM 0.1 TO 10, AND O IS A NUMBER FROM 37 TO 131.
Claim 2
Dependent Claim
102 words
THE PROCESS FOR PREPARING ACRYLIC ACID OR METHACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHACROLEIN WITH MOLECULAR OXYGEN IN THE VAPOR PHASE AT A TEMPERATURE FROM 250* TO 450*C, IN THE PRESENCE OF A CATALYST HAVING THE EMPIRICAL FORMULA: MO12-PA-XB-YY-OG WHEREIN X IS AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN AND MAGNESIUM; Y IS AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF VANADIUM AND BISMUTH; A IS A NUMBER FROM 0.1 TO 5; B IS A NUMBER 0.1 TO 10;Y IS A NUMBER FROM 0.1 TO 10, AND O IS A NUMBER FROM 37 TO 131.
Claim 3
Dependent Claim
58 words
The process of claim 1, wherein said catalysts are prepared by concentrating a solution or a suspension containing the desired components, drying the resulting concentrate, calcining the dried product at a temperature of from 250* to 450*C., for 1 to 48 hours in air, and grinding said dried product into a mesh size ranging from 5 to 100.
Claim 4
Dependent Claim
15 words
The process of claim 2, wherein the source of said molybdenum component is ammonium paramolybdate.
Claim 5
Dependent Claim
18 words
The process of claim 2, wherein the molybdenum and phosphorus components are in the form of phosphomolybdic acid.
Claim 6
Dependent Claim
17 words
The process of claim 2, wherein the molybdenum and phosphorus components are in the form of phosphomolybdates.
Claim 7
Dependent Claim
22 words
The process of claim 1, wherein Alpha is 0.2 - 3, Beta is 0.3 - 5, and gamma is 0.3 - 5.
Claim 8
Dependent Claim
47 words
The process of claim 1, wherein the catalyst is supported on a carrier selected from the group consisting of silica, silica containing materials, silicon carbide, and alumina, the amount of carrier ranging from 30 - 97% by weight based on the total weight of carrier and catalyst.
Claim 9
Dependent Claim
31 words
The process of claim 1, wherein steam is added to the gaseous reactant mixture in a concentration within the range of from 2 -80% basEd on the volume of the feed.
Claim 10
Dependent Claim
12 words
The process of claim 1, wherein methacrylic acid is produced from methacrolein.
Claim 11
Dependent Claim
24 words
The process of claim 9, wherein the conversion and selectivity of methacrolein to methacrylic accid range from 60 -70% and 75 - 83% respectively.
Claim 12
Dependent Claim
14 words
The process of claim 9, wherein the catalyst has the following empirical formula Mo12P1W1V1O44.0.
Claim 13
Dependent Claim
14 words
The process of claim 9, wherein the catalyst has the following empirical formula Mo12P1W2Bi1O43.
Claim 14
Dependent Claim
14 words
The process of claim 9, wherein the catalyst has the following empirical formula Mo12P1Mg1Bi1O41.
Claim 15
Dependent Claim
13 words
The process of claim 1, wherein X is tungsten and Y is vanadium.
Claim 16
Dependent Claim
13 words
The process of claim 1, wherein X is magnesium and Y is bismuth.
Claim 17
Dependent Claim
30 words
The process of claim 1, wherein steam and a gas selected from the group consisting of nitrogen, methane, propane, butane, and inert gases are added to the gaseous reactant mixture.
References Cited (Backward Citations)
US3686294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |