Mitsubishi Gas Chemical Company, Inc.

Japan Hydrazine Co., Ltd.

Yasuo Yamamoto

Takeo Ikarashi

Yoshio Kawai

Shuji Ebata

Mikio Yoneoka

Kazuhiko Amakawa

Shigeru Horie

Tadasi Nakamura

Kumiko Watabe

Tomiyoshi Furuta

Sadao Nozaki

Kazuo Takada

Kazuo Asakawa

Setunobu Asano

Shinichi Takano

Naoki Shirakawa

Tadashi Nakamura

A process for the preparation of pyrazolone derivatives represented by the general formula ##STR1## wherein R is a hydrogen atom, an alkyl group, an allyl group, an aryl group or an aralkyl group, and R.sub.1 and R.sub.2 are, respectively, a hydrogen atom, an alkyl group or a phenyl group which may have a substituent, comprising reacting a 2,3-dihalocarboxylic acid derivative or a 2-haloacrylic acid derivative with a hydrazine derivative. A pyrazolone or 1-substituted-3-pyrazolones useful as intermediate starting materials for the synthesis of agricultural chemicals, medicine and chemical compounds can be easily and cheaply prepared from widely used industrial starting materials.

Process for the preparation of pyrazolones

A condensed liquid obtained after separation of gaseous components from the gas produced by the steam reforming reaction of methanol is brought into contact, in a gaseous phase, with catalyst (I) containing copper oxide (A), oxide of at least one type of metals selected from the group consisting of zinc, aluminium and chromium (B) and oxide of the group VIII metal in the periodic table (C), or catalyst (II) comprising the group VIII metal in the periodic table or compound thereof supported on carriers. The treatment of the condensed liquid yields water containing substantially no methanol, ethanol and high boiling point components. The treated condensed liquid causes no pollution problem when disposed as effluent and may be reused for the steam reforming reaction of methanol.

Steam reforming of methanol

Disclosed is a process for the preparation of a catalyst for the synthesis of methyl formate by dehydrogenating methanol in the gaseous phase, said process being characterized in that (A) at least one phosphate selected from the group consisting of copper phosphates, zinc phosphates and aluminum phosphates, and (B) at least one chloride selected from the group consisting of copper chlorides, zinc chloride, aluminum chloride, alkali metal chlorides and alkaline earth metal chlorides and/or (C) at least one compound selected from the group consisting of alkali metal compounds (exclusive of halides) and alkaline earth metal compounds (exclusive of halides) are added to copper oxide, zinc oxide and aluminum oxide. The catalyst obtained according to this process has a high activity for preparing methyl formate by dehydrogenating methanol in the gaseous phase, and this catalyst is excellent in the heat resistance and durability and has a high mechanical strength.

Process for preparation of catalysts

A process for preparing a catalyst composition containing a copper oxide, a zinc oxide and an aluminum oxide as essential components and, if desired, containing a boron oxide, which comprises the following steps:

Preparation of improved catalyst composition

A copper, zinc, aluminum and boron catalyst is used as a low temperature methanol synthesis catalyst. The proportions of the catalyst components, in terms of metal atoms, are 30-70% of copper, 15-50% of zinc, 1-16% of aluminum and 0.3-5.3% of boron. This catalyst is prepared by adding an alumina sol to the mixture of copper, zinc and boron compounds and firing the total mixture.

Methanol production catalyst and process for preparing the same

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Niigata, Japan

Yasuo Yamamoto