Mitsubishi Petrochemical Company Limited

Kenji Takagi

Makoto Imanari

Yoshihisa Watanabe

Naohiro Nojiri

Koju Kadowaki

Yoshiaki Tanaka

Toshiyuki Sugihara

An .alpha.,.beta.-unsaturated aliphatic carboxylic acid can be prepared in a high yield by catalytic vapor phase oxidation of the corresponding .alpha.,.beta.-unsaturated aldehyde in the presence of a catalyst represented by the following formula:

Catalyst for production of .alpha.,.beta.-unsaturated carboxylic acids

For production of acrolein by gas-phase catalytic oxidation of propylene with molecular oxygen, there is used a catalyst containing molybdenum, bismuth, cobalt, nickel, iron, tin, silicon, and a particular borate in a prescribed proportion. Sodium or manganese is employed for formation of the desired borate. For preparation of the catalyst, the borate of each of the metals is preferably supplied in the combined form of a sodium or manganese salt of various boric acids, such as borax, although it may be supplied separately as a boric acid and a decomposable compound of each metal.

Process for production of acrolein

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Ami, Japan

Kenji Takagi