Denki Kagaku Kogyo Kabushiki Kaisha

L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude

Denka Company Limtied

Takahiro Kozuka

Jean-Marc Girard

Uichiro Yamagishi

Hiroyuki Yashima

Satoshi Watanabe

Seiichi Terasaki

Takashi Tachiyama

[Problem] To provide a novel production method for pentachlorodisilane and to obtain pentachlorodisilane having a purity of 90 mass % or more by carrying out this production method. [Solution] A production method provided with: a high-temperature reaction step in which a raw material gas containing vaporized tetrachlorosilane and hydrogen is reacted at a high temperature in order to obtain a reaction product gas containing trichlorosilane; a pentachlorodisilane generation step in which the reaction product gas obtained in the high-temperature reaction step is brought into contact with a cooling liquid obtained by circulative cooling of a condensate that is generated by cooling the reaction product gas, the reaction product gas is quickly cooled, and pentachlorodisilane is generated within the condensate; and a recovery step in which the generated pentachlorodisilane is recovered.

Pentachlorodisilane production method and pentachlorodisilane produced by same

Provided is a method of producing a polyvinyl alcohol resin, wherein the impurities in the resin are removed efficiently with a small amount of a washing liquid. A polyvinyl alcohol obtained after a polymerization step (step S) and a saponification step (step S) is washed with a washing liquid consisting of methyl acetate: 1 to 40 parts by mass, methanol: 50 to 98.9 parts by mass and water: 0.1 to 10 parts by mass in a washing step (step S). The solid matter concentration of the slurry containing the washing liquid then is 1 to 30 mass %.

Method for producing polyvinyl alcohol resin

Provided is a method and an apparatus for producing a polyvinyl alcohol that can reduce energy consumption without deterioration in quality of the product polyvinyl alcohol. First, one or more vinyl esters are polymerized or a vinyl ester and other copolymerizable monomers are copolymerized to give a polyvinyl ester. Then, a raw saponification solution containing the polyvinyl ester and an organic solvent is fed through a channeland a saponification catalyst-containing solution is introduced into the center of the channel. They are then mixed with static mixersand the mixtureis subjected to saponification reaction, as it is placed on a belt

Production method and production device for polyvinyl alcohol resins

Provided are an apparatus for removing residual monomers and a method of producing a polyvinyl alcohol resin that can prevent drift of the organic solvent gas and residual of the polymerization solution on the trays and permits efficient removal of the unreacted monomers from the polymerization solution. An apparatusfor removing residual monomers having a column main body and valve trayshaving multiple gas blowout ports each having openings only in a direction perpendicular to the flow direction of the polymerization solutionor openings directed downward in the flow direction of the polymerization solution, which are installed in multiple stages in the column main body is used in a monomer-removing step of removing monomers in a polymerization solutionby bringing an organic solvent gas, such as methanol gas, into contact with a polymerization solutionobtained from a polymerization reactor

Residual monomer elimination device and polyvinyl alcohol resin production method

Provided are a chloroprene rubber, a chloroprene rubber composition and the vulcanizate and formed body thereof superior in low-temperature properties. A chloroprene rubber is obtained by emulsion polymerization of raw monomers containing antiperiplanar trans-1-chlorobuta-1,3-diene and cis-1-chlorobuta-1,3-diene in a total amount of 0.5 mass % or more, 2,3-dichlorobuta-1,3-diene in an amount of 2.0 mass % or more, and the rest being chloroprene. A composition containing the chloroprene is vulcanized into a formed body.

Growing community of inventors

Itoigawa, Japan

Takahiro Kozuka