Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Ryo-nichi Co., Ltd.

Hiroshi Kameo

Shinji Isogai

Tomoyuki Mori

Chihiro Miyazawa

Kazuyuki Iwakai

Hiroki Hinoishi

Soichiro Saita

Masayuki Otake

Souichi Orita

Kazunari Takahashi

Hiroshi Takeo

Kazunaga Komizo

Hidenobu Kajitani

Takeshi Takeuchi

Tetsufumi Yamaguchi

Tetsuaki Kihara

Tsunekazu Akiyama

An object of the present invention is to suppress performance deterioration of a molybdenum composite oxide-based catalyst at the time of performing gas-phase catalytic partial oxidation with molecular oxygen by using a tubular reactor. The present invention relates to a catalytic oxidation method using a tubular reactor in which a Mo compound layer containing a Mo compound and a composite oxide catalyst layer containing a Mo composite oxide catalyst are arranged in this order from a reaction raw material supply port side and under a flow of a mixed gas containing 75 vol % of air and 25 vol % of water vapor at 440&#xb0; C., a Mo sublimation amount of the Mo compound is larger than a Mo sublimation amount of the Mo composite oxide catalyst under the same conditions.

Catalytic oxidation method and method for producing conjugated diene

The invention is concerned with a method for producing a conjugated diene including a reaction step of subjecting a raw material gas containing a monoolefin having a carbon atom number of 4 or more to an oxidative dehydrogenation reaction with a gas containing molecular oxygen in the presence of a catalyst, to obtain a reaction product gas containing a conjugated diene; and a cooling step of cooling the reaction product gas, wherein in the cooling step, a cooling agent is supplied into a cooling column and brought into contact with the reaction product gas; the cooling agent discharged from the cooling column is then cooled by a heat exchanger; a precipitate dissolved in the cooling agent is precipitated within the heat exchanger and recovered; and the cooling agent from which the precipitate has been recovered is circulated into the cooling column.

Method for producing conjugated diene

Disclosed is a method for producing a conjugated diene by subjecting a monoolefin having a carbon atom number of 4 or more and an oxygen gas to an oxidative dehydrogenation reaction by using a molybdenum-containing metal oxide catalyst under heat removal with a coolant, wherein an amount of molybdenum adhered onto a cooling heat transfer surface within a reactor is kept at not more than 20 mg/m, or not only a surface roughness Ra of a cooling heat transfer surface within a reactor is not more than 3 &#x3bc;m, but a temperature difference between a reaction temperature and a coolant temperature is in the range of from 5 to 220&#xb0; C.

The disclosure describes a process for producing alkadienols comprising the steps of: reacting a conjugated alkadiene with water in a reaction solvent in the presence of a palladium catalyst; distilling the obtained reaction mixture so as to separate the reaction solvent from the reaction mixture while directly supplying heated water, steam or a mixture thereof as a heating medium to a distillation column, under the condition that the temperature of a bottom liquid in the distillation column is not higher than 120.degree. C.; and phase-separating bottoms discharged from the bottom of the distillation column.

Process for producing alkadienols

A method for producing allyl alcohols, which comprises heat-treating diallyl ethers in the presence of a catalyst containing a palladium compound and a phosphorus compound to convert them to allyl alcohols, wherein the heat treatment is conducted under such conversion reaction conditions that the value of function F represented by the following formula is within a range of 0.ltoreq.F&lt;100, the concentration of allyl alcohols in the conversion reaction solution is not higher than 20 wt %, and the Pd concentration in the conversion reaction solution is within a range of from 0.005 to 1.0 wt %:

Method for producing allyl alcohols

A method for continuously producing alkadienols, which comprises subjecting a conjugated alkadiene and water to a hydration dimerization reaction in a continuous type reactor in the presence of carbon dioxide and a catalyst comprising a palladium compound and a phosphorus compound, wherein a hydrophobic phosphorus compound is used as the phosphorus compound, and the reaction is carried out in the presence of an amine while maintaining the concentration of the conjugated alkadiene in the reaction solution in the reactor within a range of from 0.5 to 4.5 wt %.

Method for continuously producing alkadienols

A process for producing a lactone by reacting in a hydrogenation reaction zone a dicarboxylic acid, a dicarboxylic acid anhydride and/or a dicarboxylic acid ester with hydrogen in a liquid phase using a solvent in the presence of a catalyst comprising ruthenium and an organic phosphine, which process comprises the following steps (1) to (6):

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Kurashiki, Japan

Hiroshi Kameo