Nitto Kagaku Kogyo Kabushiki Kaisha

Nitto Chemical Industry Co., Ltd.

Mitsubishi Rayon Company, Limited

Nitto Kagaku Kogyu Kabushiki Kaisha

Takeyuki Fujita

Michio Fukatsu

Yoshiro Ashina

Kiyonobu Niwa

Junsuke Yagi

Kazumoto Ogura

Takeshi Inagaki

Takeshi Narita

Yasuyuki Takayanagi

Tuyoshi Irie

Masaru Suto

Yuya Yano

Yuko Nikaido

Disclosed is an improvement in a process for catalytic production of methylamines from methanol and NH.sub.3, or methanol, a mixture of methylamines and NH.sub.3, or a mixture of methylamines and NH.sub.3, in a gaseous phase, over a bed of a zeolite catalyst, where the improvement is that the catalyst bed is divided into two or more sub-beds, and the difference between the inlet and outlet temperatures of each catalyst sub-bed is kept in the range of approximately 5.degree. C. to approximately 70.degree. C. while the reaction is carried out.

Production of methylamines

There is provided a method for maintaining the activity of a zeolite catalyst in the catalytic production of methylamines from methanol and ammonia using a zeolite catalyst as at least one of catalysts applied, which comprises controlling the amount of aldehyde compounds as impurities flowing into a zeolite catalyst layer to about 0.15 g/hr.kg-cat. or lower, as calculated in terms of formaldehyde.

Method for maintaining the activity of zeolite catalysts

N-substituted maleimides are prepared by reacting maleic anhydride with an amine in the presence of Cu or a copper compound and purifying the maleimide produced in the absence of presence of said Cu or copper compound. N-substituted maleimides are widely useful or starting materials or intermediates for medicines, agricultural chemicals, dyes, macromolecular compounds, and the like.

Process for producing N-substituted maleimides

A process for the selective production of dimethylamine in preference to mono- and trimethylamines by a catalytic vapor phase reaction of ammonia and methanol over a zeolite selected from mordenite, clinoptilolite and erionite is disclosed, wherein the improvement is characterized by the fact that the zeolite used has been contacted with steam at a temperature of 250.degree. to 700.degree. C.

Process for producing dimethylamine in preference to mono- and

Catalytic production of dimethylamine in preference to mono- and trimethylamine over a mordenite catalyst is disclosed, which mordenite is characterized by its alkali metal content.

Process for producing dimethylamine in preference to mono- or

A process for producing dimethylformamide which comprises reacting methanol and ammonia to give methylamines, separating a dimethylamine-trimethylamine mixture from the methylamines, and reacting the dimethylamine-trimethylamine mixture with carbon monoxide to produce dimethylformamide.

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Yokosuka, Japan

Takeyuki Fujita