Asahi Kasei Kogyo Kabushiki Kaisha

Ryoichi Mitsui

Atsushi Aoshima

Nobuhiro Tamura

Tatsuo Yamaguchi

Yoshio Suzuki

Yohei Fukuoka

Toshiaki Kaneko

Setsuo Yamamatsu

Tadayuki Ibuki

Hitoshi Nihei

Toshiaki Murobushi

A process for producing methacrolein by oxidizing isobutylene or tertiary butanol with molecular oxygen, characterized by contacting a gaseous mixture of isobutylene or tertiary butanol, air or oxygen and optionally steam and an inert gas with a catalyst having the general composition:

Process for producing methacrolein

A method for preparing methacrolein by oxidizing isobutylene or tertiary butanol with molecular oxygen, characterized by contacting a gaseous mixture of isobutylene or tertiary butanol, air or oxygen and optionally steam and an inert gas with a catalyst having the general combination:

Method for preparing methacrolein

Methanol is allowed to flow downwardly and contacted countercurrently with an unsaturated aldehyde-containing gas obtained from gas phase catalytic oxidation of the starting gas containing at least one gas selected from the group consisting of propylene, isobutylene and t-butanol, said methanol being supplied in such an amount that substantially the whole thereof can be gasified in the treatment. According to this method, the water content in said unsaturated aldehyde-containing gas can be rendered smaller than that in the azeotropic mixture of the unsaturated aldehyde and water, and also there takes place no polymerization of the unsaturated aldehyde.

Method for dehydration of unsaturated aldehyde-containing gas

A process for producing methacrolein by oxidation of isobutylene or tert-butanol with molecular oxygen in the presence of a catalyst having the following composition: ti Mo.sub.12 Bi.sub.a Fe.sub.b Ni.sub.c Pb.sub.d X.sub.f O.sub.g or

A carboxylic ester is produced in one step in a high yield and with a high selectivity by reacting an aldehyde with an alcohol in the presence of oxygen by using a catalyst comprising (I) palladium, (II) at least one compound selected from the group consisting of lead compounds, thallium compounds and mercury compounds and (III) at least one compound selected from the group consisting of alkali metal compounds and alkaline earth metal compounds.

Process for producing carboxylic esters

A process for producing tert-butanol by selective hydration of isobutylene in a hydrocarbon mixture comprising isobutylene and n-butene where an aqueous solution is used which contains a heteropolyacid, characterized in that the hydration reaction of isobutylene is carried out at a temperature of less than 100.degree. C.

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Fuji, Japan

Ryoichi Mitsui