Patent US3028980A successfully refreshed from Google Patents.
Patent US4136110A successfully refreshed from Google Patents.
US4136110A
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: 1979-01-23
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Expires: 1997-01-31
Abstract
Abstract Methacrylic acid or acrylic acid is 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 and phosphorus, promoted with chromium or at least one element selected from the group consisting of thallium, rubidium, cesium, potassium, titanium, and arsenic, or a mixture thereof, wherein at least part of the molybdenum employed in the preparation of the catalyst is supplied in the form of molybdenum trioxide. The oxidation of methacrolein in the presence of a catalyst wherein all the molybdenum employed in the preparation of the catalyst has been supplied by molybdenum trioxide gives especially desirable high yields and selectivities to methacrylic acid.
Inventors
- 👤 James F. White
- 👤 James R. Rege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:54
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; B01J23/00; B01J23/16; B01J23/24; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
183 words
In a process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or 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 an oxide catalyst, and optionally in the presence of steam, the improvement comprising using as the catalyst a catalyst of the formula: A.sub.a Mo.sub.3 P.sub.c O.sub.x wherein A is at least one element selected from the group consisting of rubidium, cesium, thallium, and potassium; wherein a is a positive number less than about 3; c is a positive number less than about 2; x is the number of oxygens required by the valence state of the other elements present; wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension and (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component and at least one compound containing the A component.
Claim 2
Dependent Claim
183 words
In a process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or 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 an oxide catalyst, and optionally in the presence of steam, the improvement comprising using as the catalyst a catalyst of the formula: A.sub.a Mo.sub.3 P.sub.c O.sub.x wherein A is at least one element selected from the group consisting of rubidium, cesium, thallium, and potassium; wherein a is a positive number less than about 3; c is a positive number less than about 2; x is the number of oxygens required by the valence state of the other elements present; wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension and (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component and at least one compound containing the A component.
Claim 3
Dependent Claim
74 words
The process of claim 1 wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension; (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component and (d) adding at least one compound containing the A component to the resulting refluxed slurry or suspension.
Claim 4
Dependent Claim
9 words
The process of claim 1 wherein A is rubidium.
Claim 5
Dependent Claim
9 words
The process of claim 1 wherein A is cesium.
Claim 6
Dependent Claim
9 words
The process of claim 1 wherein A is thallium.
Claim 7
Dependent Claim
9 words
The process of claim 1 wherein A is potassium.
Claim 8
Dependent Claim
9 words
The process of claim 1 wherein methacrolein is reacted.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the catalyst prepared is Rb 0 .5 Mo 3 P 0 .33 O x .
Claim 10
Dependent Claim
165 words
In a process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or 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 an oxide catalyst, and optionally in the presence of steam, the improvement comprising using as the catalyst a catalyst of the formula: Ti.sub.a Mo.sub.3 P.sub.c O.sub.x wherein a is a positive number less than about 3; c is a positive number less than about 2; x is the number of oxygens required by the valence states of the other elements present; wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension and (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component and at least one compound containing the A component.
Claim 11
Dependent Claim
165 words
In a process for the preparation of acrylic acid or methacrylic acid by the oxidation of acrolein or 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 an oxide catalyst, and optionally in the presence of steam, the improvement comprising using as the catalyst a catalyst of the formula: Ti.sub.a Mo.sub.3 P.sub.c O.sub.x wherein a is a positive number less than about 3; c is a positive number less than about 2; x is the number of oxygens required by the valence states of the other elements present; wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension and (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component and at least one compound containing the A component.
Claim 12
Dependent Claim
73 words
The process of claim 9 wherein said oxide catalyst is prepared in the absence of ammonia or a compound containing ammonium by: (a) forming an aqueous slurry or suspension of molybdenum trioxide; (b) refluxing the aqueous slurry or suspension; (c) adding to the refluxed aqueous slurry or suspension at least one compound containing the phosphorus component; (d) adding at least one compound containing the A component to the resulting refluxed slurry or suspension.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |