Catalyst for production of unsaturated carboxylic acid, preparat

Details Catalyst for production of unsaturated carboxylic acid, preparat Catalyst for production of unsaturated carboxylic acid, preparat

1980-09-04

1982-12-21

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252437, 252443, 252455R, 252464, 562535, B01J 2718, B01J 2100

Patent

active

043648444

ABSTRACT:
An improved catalyst suitable for use in the production of an unsaturated carboxylic acid by the catalytic vapor phase oxidation of an unsaturated aldehyde is provided. In this catalyst, a heat-resistant inorganic substance, such as alumina, silica-alumina and silicon carbide, having a particle diameter of 3 through 10 mm, an apparent porosity of 35 through 60%, a water absorption of 20 through 50%, an average pore diameter of not less than 40 microns, a specific surface area of not more than 2 m.sup.2 /g and a bulk specific gravity of 1.5 through 2.0 is used for supporting a composition containing molybdenum, phosphorus, vanadium and the alkali metals. The use of the above-mentioned carrier results in the advantages that the unsaturated carboxylic acid, such as methacrylic acid, can be selectively produced from the unsaturated aldehyde at a high yield and that the mechanical strength of the catalyst is remarkably improved.

REFERENCES:
patent: 4075244 (1978-02-01), Akiyama et al.
patent: 4092271 (1978-11-01), Sze
patent: 4113745 (1978-09-01), Strojny et al.
patent: 4146733 (1979-03-01), White et al.
patent: 4174459 (1979-11-01), Sakamoto et al.
patent: 4225466 (1980-09-01), Wada et al.
patent: 4238359 (1980-12-01), Akiyama et al.

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