Patent US4259211A successfully refreshed from Google Patents.
US4259211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the oxidation of acrolein and methacrolein to acrylic acid and methacrylic acid, respectively
Assignee: BASF SE
•
Filing: 1978-11-24
•
Granted: 1981-03-31
•
Expires: 1998-11-24
Abstract
Abstract Catalysts which consist of a molded carrier, the surface of which is coated with an active catalyst composition of the general formula Mo 12 A a B b C c D d O x , where A is V and/or W, B is Cu and/or Fe and/or Mn and/or Ni and/or Cr, C is Nb and/or Ta and/or Bi and/or Sb and/or Sn and/or Th and/or Ce and/or U, D is Li and/or Na and/or K and/or Rb and/or Cs and/or Tl and a is from 0.1 to 18, b is from 0 to 8, c is from 0 to 10, d is from 0 to 2 and x is from 36 to 135, which are particularly active and selective for the oxidation of acrolein and methacrolein with oxygen-containing gases to give acrylic acid and methacrylic acid, respectively, are obtained by first manufacturing the catalyst composition, before applying it to the carrier, from thermally easily decomposed salts of the components by mixing aqueous solutions, slurries or moist solid masses of the salts of the components, drying the mixture and calcining the dried composition at from 140° to 600° C., then milling it to a particle size of less than 150 μm and thereafter applying it, as a mixture with water, as a layer from 10 to 1,500 μm thick, to the premolded carrier, which has a rough surface.
Inventors
- 👤 Richard Krabetz
- 👤 Walter Herrmann
- 👤 Norbert Scholz
- 👤 Heinz Engelbach
- 👤 Gerd-Juergen Engert
- 👤 Carl-Heinz Willersinn
- 👤 Gerd Duembgen
- 👤 Fritz Thiessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:46
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/002; B01J23/16; B01J23/24; B01J23/32; B01J23/34; B01J37/00; B01J37/02; B01J37/0215; B01J37/0221; B01J37/0236; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
287 words
A catalyst for the gas phase oxidation of acrolein or methacrolein with an oxygen-containing gas to give acrylic acid or methacrylic acid, respectively, said catalyst comprising a premolded inert carrier having a rough surface which has been coated with an active catalyst composition of the formula Mo 12 A a B b C c D d O x , wherein: A is a mixture of V and W; B is copper or copper in a mixture with a metallic element selected from the group consisting of Fe, Mn, Ni, and Cr; C is a metallic element selected from the group consisting of Nb, Ta, Bi, Sb, Sn, Th, Ce, and U; D is a metallic element selected from the group consisting of Li, Na, K, Rb, Cs and Tl; and a is from 0.5 to 12 for vanadium and from 0.2 to 6 for tungsten, the sum for vanadium and tungsten being from 2.5 to 18, b is from 0.5 to 8, the meaning of b for copper being 0.5 to 6, c is from 0 to 10, d is from 0 to less than 0.1 and x is from 41 to 127.75, said active catalyst composition being first manufactured, before its application to the carrier, from thermally easily decomposed salts of the metallic components by mixing aqueous solutions, slurries or moist solid masses of said easily decomposed salts, drying the mixture and calcining the dried composition at from 140° to 600° C., and said active catalyst composition in a particle size reduced to less than 150 micrometer then being applied together with water to the rough surface of the premolded carrier to form an active catalyst layer having a thickness of from 10 to 1,500 micrometer.
Claim 2
Dependent Claim
287 words
A catalyst for the gas phase oxidation of acrolein or methacrolein with an oxygen-containing gas to give acrylic acid or methacrylic acid, respectively, said catalyst comprising a premolded inert carrier having a rough surface which has been coated with an active catalyst composition of the formula Mo 12 A a B b C c D d O x , wherein: A is a mixture of V and W; B is copper or copper in a mixture with a metallic element selected from the group consisting of Fe, Mn, Ni, and Cr; C is a metallic element selected from the group consisting of Nb, Ta, Bi, Sb, Sn, Th, Ce, and U; D is a metallic element selected from the group consisting of Li, Na, K, Rb, Cs and Tl; and a is from 0.5 to 12 for vanadium and from 0.2 to 6 for tungsten, the sum for vanadium and tungsten being from 2.5 to 18, b is from 0.5 to 8, the meaning of b for copper being 0.5 to 6, c is from 0 to 10, d is from 0 to less than 0.1 and x is from 41 to 127.75, said active catalyst composition being first manufactured, before its application to the carrier, from thermally easily decomposed salts of the metallic components by mixing aqueous solutions, slurries or moist solid masses of said easily decomposed salts, drying the mixture and calcining the dried composition at from 140° to 600° C., and said active catalyst composition in a particle size reduced to less than 150 micrometer then being applied together with water to the rough surface of the premolded carrier to form an active catalyst layer having a thickness of from 10 to 1,500 micrometer.
Claim 3
Dependent Claim
20 words
A catalyst as claimed in claim 1, wherein the carrier has a mean diameter of from 2 to 7 mm.
Claim 4
Dependent Claim
16 words
A catalyst as claimed in claim 1, wherein the carrier is in the shape of spheres.
Claim 5
Dependent Claim
19 words
A catalyst as claimed in claim 1, wherein the carrier has surface recesses of from 20 to 750 μm.
Claim 6
Dependent Claim
48 words
A catalyst as claimed in claim 1, wherein the inner surface area of the carrier is from 1 to 20 m 2 /g and its porosity is from 1 to 65%, and from 50 to 85% of the pores have a diameter of from 20 to 1,500 μm.
Claim 7
Dependent Claim
33 words
A catalyst as set forth in claim 1 wherein said carrier is selected from the group consisting of aluminum oxides, natural and synthetic silicates and aluminosilicates, silicon carbide, zirconium oxides and titanium oxides.
Claim 8
Dependent Claim
32 words
A catalyst as set forth in claim 1 wherein said active catalyst composition is applid to the carrier by spraying a suspension of the active catalyst composition in water onto the carrier.
Claim 9
Dependent Claim
42 words
A catalyst as set forth in claim 1 wherein said active catalyst composition is applied to the carrier by feeding said active catalyst composition having a particle size less than 150 micrometers at a constant speed onto vigorously agitated, continuously moistened carrier.
References Cited (Backward Citations)
US3567773A
Cited
US3736354A
Cited
US3773692A
Cited
US3773828A
Cited
GB1387776A
Cited
US4111983A
Cited
DE2448804A1
Cited
US3988359A
Cited
US3956377A
Cited
US4157987A
Cited
US4035262A
Cited
US4138366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |