Central Glass Company, Limited

Akira Ishihara

Yasuo Hibino

Chikashi Kawashima

Seiiti Minegishi

Katunori Kawamura

Iwao Ojima

Toshio Koishi

Takashi Yasumura

Ryoichi Tamai

Satoshi Nakahata

Takeshi Asanawa

Takamasa Fuchigami

Disclosed is a method of purifying (Z)-1-chloro-3,3,3-trifluoropropene of the formula [1], comprising: distilling a mixture containing (Z)-1-chloro-3,3,3-trifluoropropene and 1-chloro-1,3,3,3-tetrafluoropropane (CFCHCHClF), wherein the distilling is performed by extractive distillation of the mixture in the coexistence of at least one kind of compound selected from the group consisting of halogenated hydrocarbons of the formula [2], halogenated unsaturated hydrocarbons, nitriles, ketones, carbonates, ethers, esters and alcohols as an extractant

Method of purifying (Z)-1-chloro-3,3,3-trifluoropropene

There is provided an azeotrope or azeotrope-like composition containing (A) 1,1,2,2-tetrafluoro-1-methoxyethane and (B) a compound formed of at least one selected from the group consisting of (Z)-1-chloro-3,3,3-trifluoropropene, 2-bromo-3,3,3-trifluoropropene, and (E)-2-bromo-1,3,3,3-tetrafluoropropene.

Azeotrope or azeotrope-like composition comprising 1,1,2,2-tetrafluoro-1-methoxyethane

Disclosed is a method for producing 3,3,3-trifluoropropyne, which is characterized in that a base is reacted with (Z)-1-halogeno-3,3,3-trifluoropropene represented by formula [1]. It is possible by this production method to obtain 3,3,3-trifluoropropyne with high yield. Furthermore, since waste disposal is also easy, it is a production method that is industrially advantageous.

Method for producing 3,3,3-trifluoropropyne

The invention relates to an elastic fluorohydrocarbon resin. This resin is obtained by graft copolymerization of a first segment which is one of fluorine-containing elastomeric and crystalline polymers with a second segment which is the other of these polymers. The first segment is prepared by copolymerizing at least one first unsaturated monomer that has peroxy bond with at least one second fluorine-containing monomer. When the first monomer is dissolved in a first solvent prior to the copolymerization, the copolymerization can be safely conducted with higher yield. This first solvent is selected from a carboxylic ester of t-butanol, methylene chloride, 1,1,1-trichloroethane, and first, second, third and fourth compounds which are respectively represented by R.sup.1 COOR.sup.2, C.sub.2 H.sub.x Cl.sub.y F.sub.z, C.sub.3 H.sub.x Cl.sub.y F.sub.z, and C.sub.4 H.sub.x Cl.sub.y F.sub.z. When the fluorine-containing elastomeric copolymer as the first segment is purified by contact with a barium salt prior to the graft copolymerization, the elastic fluorohydrocarbon resin becomes improved in thermal stability. When the fluorine-containing elastomeric copolymer having a water content of 0.1-50 wt % as the first segment is dispersed in a liquid medium containing t-butanol and water, it becomes unnecessary to dry this elastomeric copolymer prior to the graft copolymerization. When the fluorine-containing elastomeric copolymer as the first segment is dispersed in another liquid medium containing t-butanol, water, a carboxylic ester and barium hydroxide, the elastic fluorohydrocarbon resin becomes improved in thermal stability with higher graft copolymerization rate.

Elastic fluorohydrocarbon resin and method of producing same

The subject is the preparation of chlorotrifluoroethylene (CTFE) by a known reaction of 1,1,2-trichloro-1,2,2,-trifluoroethane (R-113) with zinc powder dispersed in an alcohol such as methanol, and the object of the invention is industrially easily and smoothly carrying out the reaction in a continuous manner. The disclosed process uses a plurality of stirred tank reactors, usually two or three reactors, which are connected to each other in a series arrangement by overflow pipes. A dispersion of zinc powder in an alcohol is continuously fed into the first reactor only so as to allow the dispersion to overflow into the next reactor and then into the remaining reactor(s) in turn, and R-113 is continuously fed into each reactor. CTFE is continuously discharged from each reactor, while zinc in the initially fed dispersion is gradually converted into zinc chloride. In the last reactor the conversion of zinc reaches 90% or above. Together with the remaining zinc powder the solution of zinc chloride in the alcohol is continuously discharged from the last reactor and can easily be recovered.

Continuous process for preparing chlorotrifluoroethylene

An .alpha.-trifluoromethylacrylate, which does not undergo radical homopolymerization, is easily and efficiently copolymerized with styrene or its derivatives by using a common radical polymerization initiator. The composition of the resultant copolymer does not greatly vary with the proportions of the monomers subjected to copolymerization and usually is close to an alternating copolymer.

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Kawagoe, Japan

Akira Ishihara