Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Tetsuro Dozono

Tsutomu Katsumata

Makoto Honda

Kunitoshi Aoki

Shinsuke Fukuoka

Tomonari Watanabe

Method for producing a crystallized aromatic polycarbonate, and a

In the preparation of methacrylonitrile by gas-phase ammoxidation of isobutylene or tertiary butanol, the reaction is carried out (A) (i) using a catalyst system consisting essentially of (1) 30-70% by weight of a silica catalyst carrier and (2) a catalyst material having a composition represented by the formula:

Production of methacrylonitrile

Malononitrile is prepared in a high yield by catalytic oxidative dehydrogenation of .beta.-aminopropionitrile in a gaseous phase with molecular oxygen in the presence of a catalyst, comprising a oxide composition of, preferably, Mo and at least one other catalytic element, more preferably, of the empirical formula (I):

Process for producing malononitrile

A catalyst composition having a composition represented by the formula:

Catalyst composition

A process for the preparation of acrylonitrile by the ammoxidation reaction of propylene, characterized by using an oxide type catalyst which contains, as active ingredients, molybdenum, bismuth, iron and at least one element selected from potassium, rubidium and cesium in specifically limited proportions and which may further contain sodium and/or phosphorus. By the use of such a specific catalyst, the selectivity for the desired acrylonitrile is remarkably improved, and there can be attained high yield of the product. In the process of the present invention, the catalyst can maintain a high activity and a high selectivity for a long time, without undergoing attrition. The catalyst is well prevented from sublimation-escaping of the ingredient molybdenum therefrom.

Growing community of inventors

Yokosuka, Japan

Tetsuro Dozono