US3865873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing acrylic acid and or methacrylic acid from acrolein or methacrolein
Assignee: AGC Inc
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Filing: 1972-10-20
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Granted: 1975-02-11
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Expires: 1992-10-20
Abstract
Abstract A process for preparing acrylic acid or methacrylic acid which comprises reacting acrolein or methacrolein with molecular oxygen in the presence of a catalyst consisting essentially of (a) molybdenum, (b) phosphorus, (c) at least one element selected from the group consisting of niobium, tantalum and titanium, and (d) oxygen, as the essential components, and (e) at least one element selected from the group consisting of tin, nickel, magnesium, tungsten, bismuth and iron, as an optional component.
Inventors
- 👤 Yoshio Oda
- 👤 Keiichi Uchida
- 👤 Takeshi Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:14
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J23/00; B01J23/16; B01J23/24; B01J23/28; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A PROCESS FOR PREPARING ACRYLIC ACID OR METHYLACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHYLACROLEIN WITH MOLECULAR OXYGEN IN VAPOR PHASE AT A TEMPERATUE OF FROM 250* TO 450*C, IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (A) MOLYBDENUM, (B) PHOSPHORUS, (C) AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, TATALUM AND TITANIUM, AND (D) OXYGEN.
Claim 2
Dependent Claim
60 words
A PROCESS FOR PREPARING ACRYLIC ACID OR METHYLACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHYLACROLEIN WITH MOLECULAR OXYGEN IN VAPOR PHASE AT A TEMPERATUE OF FROM 250* TO 450*C, IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (A) MOLYBDENUM, (B) PHOSPHORUS, (C) AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, TATALUM AND TITANIUM, AND (D) OXYGEN.
Claim 3
Dependent Claim
59 words
A process as set forth in claim 1, wherein said catalysts having the empirical formula: Mo12-P -X -O wherein X is at least one element selected from the group consisting of niobium, tantalum and titanium, Alpha is a number of 0.1 to 5, Beta is a number of 0.1 to 10, gamma is a number of 36 to 81.
Claim 4
Dependent Claim
87 words
A PROCESS FOR PREPARING ACRYLIC ACID OR METHACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHACROLEIN WITH MOLECULAR OXYGEN IN VAPOR PHASE AT A TEMPERATURE OF FROM ABOUT 250* TO ABOUT 450*C, IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (A) MOLYBDENUM (B) PHOSPHORUS, (C), AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, TANTALUM AND TITANIUM, (D) OXYGEN AND (E) A MEMBER SELECTED FROM THE GROUP CONSISTING OF TIN, MAGNESIUM, TUNGSTEN, TIN AND MAGNESIUM, TIN AND TUNGSTEN, IRON AND TUNGSTEN, AND MAGNESIUM AND NICKEL.
Claim 5
Dependent Claim
87 words
A PROCESS FOR PREPARING ACRYLIC ACID OR METHACRYLIC ACID WHICH COMPRISES REACTING ACROLEIN OR METHACROLEIN WITH MOLECULAR OXYGEN IN VAPOR PHASE AT A TEMPERATURE OF FROM ABOUT 250* TO ABOUT 450*C, IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (A) MOLYBDENUM (B) PHOSPHORUS, (C), AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, TANTALUM AND TITANIUM, (D) OXYGEN AND (E) A MEMBER SELECTED FROM THE GROUP CONSISTING OF TIN, MAGNESIUM, TUNGSTEN, TIN AND MAGNESIUM, TIN AND TUNGSTEN, IRON AND TUNGSTEN, AND MAGNESIUM AND NICKEL.
Claim 6
Dependent Claim
95 words
A process as set forth in claim 3, wherein said catalysts having the empirical formula: Mo12-P -X -Y -O wherein X is at least one element selected from the group consisting of niobium, tantalum and titanium; Y is a member selected from the group consisting of tin, magnesium, tungsten, tin and magnesium, tin and tungsten, iron and tungsten, and magnesium and nickel; Alpha is a number of 0.1 to 5; Beta is a number of 0.1 to 10; delta is a number of 0.1 to 10 and epsilon is a number of 38 to 111.
Claim 7
Dependent Claim
51 words
A process as set forth in claim 1, wherein said catalysts are prepared by concentrating a solution or suspension containing requested 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 into the desired size.
Claim 8
Dependent Claim
25 words
A process as set forth in claim 5, wherein as the source of molybdenum component, being one of said requested components, ammonium paramolybdates are used.
Claim 9
Dependent Claim
27 words
A process as set forth in claim 5, wherein as a common source for molybdenium and phosphorus components, being two of said requested components, phosphomolybdate is used.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |