Daikin Industries, Ltd.

Tomoyuki Iwamoto

Takashi Usui

Kazuhiro Takahashi

Takehiro Chaki

Tsubasa Nakaue

Megumi Kushida

Yuuko Ito

The present disclosure provides a method for purifying HFO-1132 to a high purity while suppressing the isomerization and loss of HFO-1132. Specifically, the present disclosure provides a method for purifying 1,2-difluoroethylene, which is HFO-1132, the method comprising, in this order,

Method for purifying 1,2-difluoroethylene (HFO-1132)

Provided is a method for producing an olefin compound using reaction with a base, whereby a target product with a higher purity than the prior art can be obtained. Specifically, provided is a method for producing an olefin compound by reacting a phosphorus-containing olefin compound salt with a base to obtain a dephosphorized and hydrogenated olefin compound, wherein the temperature of the reaction is 50° C. or less.

Olefin compound production method

Provided is a method for purifying a phosphorus-containing olefin compound salt as a raw material or an intermediate that is useful to increase the purity of a target product in a method for producing an olefin compound and that can be applied to the production method, and a method for producing an olefin compound using a purified product obtained thereby. Specifically, provided is a method for purifying a phosphorus-containing olefin compound salt, comprising reprecipitating and/or recrystallizing a solid comprising at least one phosphorus-containing olefin compound salt selected from the group consisting of:

Method for purifying phosphorus-containing olefin compound salt and method for producing olefin compound using purified product obtained thereby

The production method according to the present disclosure comprises obtaining a product containing the fluoroethane from a fluoroethylene by a reaction in the presence of catalysts. Each catalyst is formed by supporting a noble metal on a carrier. A reactor for performing the reaction is filled with a catalyst having a noble metal concentration of C1 mass % based on the entire catalyst and a catalyst having a noble metal concentration of C2 mass % based on the entire catalyst to form an upstream portion and a downstream portion, respectively; and C1&#x3c;C2. The reaction is performed by bringing the fluoroethylene represented by formula (3) and hydrogen gas into contact with the upstream portion and the downstream portion in this order.

Production method for fluoro-ethane and production method for fluoro-olefin

Provided are a method for producing a fluoroethane, which is the desired product, with high selectivity; and a method for producing a fluoroolefin. The production method according to the present disclosure comprises obtaining a product comprising a fluoroethane represented by CXXFCXXX(wherein X, X, X, X, and Xare the same or different and each represents a hydrogen atom, a fluorine atom, or a chlorine atom; and at least one of X, X, X, X, and Xrepresents a hydrogen atom) from a fluoroethylene by a reaction in the presence of at least one catalyst in at least one reactor. The reaction is performed by introducing a starting material gas comprising the fluoroethylene into the reactor, and the water content in the starting material gas is 150 ppm by mass or less based on the total mass of the starting material gas.

Fluoroethane production method and fluoroolefin production method

The production method according to the present disclosure comprises obtaining a product comprising a fluoroethane from a fluoroethylene by a reaction in the presence of at least one catalyst. The reaction is performed in two or more reaction zones. Each reaction zone comprises a catalyst, and the fluoroethylene is supplied to each reaction zone to perform the reaction.

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Osaka, Japan

Tomoyuki Iwamoto