Daikin Industries, Ltd.

Kenji Otoi

Yoshiyuki Hiraga

Hideki Nakaya

Mitsuo Tsukamoto

Tadahiro Yabu

Yoshiyuki Takase

Tomohisa Noda

Yuji Imahori

Michinobu Koizumi

Nobuo Fukita

Hitoshi Motoyama

Shoji Itakura

Kayui Go

Mai Taguchi

Hideya Saitou

The present disclosure provides a method for processing a fluorine-containing aqueous solution. The method comprises a reaction step for mixing in a vertical direction the fluorine-containing aqueous solution and a disiloxane compound represented by a general formula RRRSiOSiRRR, wherein R, R, R, R, Rand Rare selected independently from each other from a group consisting of a phenyl group and an alkyl group comprising from 1 to 20 carbon atoms and hydrogen, to react a fluorine ion in the fluorine-containing aqueous solution with the disiloxane compound, obtaining a first reaction liquid containing a monofluorosilane compound represented by general formulas RRRSiF and RRRSiF.

Method for processing fluorine-containing aqueous solution

The present invention provides a polymerization inhibitor preventing the self-polymerization of TFE and the generation of a modified polymer of a polymerization inhibitor in a distillation step, particularly in a rectification step, of TFE. The present invention provides a method of distilling tetrafluoroethylene in the presence of a polymerization inhibitor comprising a cyclohexadiene compound of the formula:R-A-Rwherein Ris a hydrocarbon group having 1 to 5 carbon atoms, Ris a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and A is a cyclohexadiene ring. The cyclohexadiene compound is preferably &#x3b1;-terpinene or &#x3b3;-terpinene.

Polymerization inhibitor for tetrafluoroethylene

A method of purifying a treatment target substance containing a fluorine-containing surfactant which includes removing at least part of the fluorine-containing surfactant from the treatment target substance by contacting the treatment target substance with a gas containing carbon dioxide. The fluorine-containing surfactant is an ether oxygen-free anionic compound represented by one of general formulae (1) and (2) as defined herein.

Method for purifying material to be treated and method for producing coagulated material

The present invention has for its object to provide a method of producing fluoropolymers with high productivity under comparatively low temperature and low pressure conditions which are conducive to reduced cost of commercial-scale production equipment. The present invention is directed to a method of producing a fluoropolymer which comprises polymerizing a radical polymerizable monomer in a defined reaction-field, said radical polymerizable monomer comprising a fluorine-containing ethylenic monomer and said defined reaction-field being in supercriticality-expression state with a monomer density [&#x3c1;]-monomer critical density [&#x3c1;] ratio of [&#x3c1;/&#x3c1;] not less than 1.1.

Process for producing fluoropolymer

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Settsu, Japan

Kenji Otoi