A redox-initiated per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides
摘要:
The per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides, initiated by ammonium persulfate/sodium formate (NH4)2S2O8/HCO2Na), is described. The reaction proceeds smoothly in polar aprotic solvents. The presence of functional groups like sodium carboxylate or sulfonate in the polyfluoroalkyl chloride appear to facilitate the reaction. The reaction appears to be initiated by a single-electron transfer, represents the first example of the reactivity of per(poly)fluoroalkyl chlorides, and also demonstrates their use as per(poly)fluoroalkylating agents. For alpha-chloro-omega-iodoperfluoroalkanes only the carbon-iodine bond is cleaved during the reaction. An explanation for the apparent stability of the carbon-chlorine bond in such compounds is given.
A redox-initiated per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides
摘要:
The per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides, initiated by ammonium persulfate/sodium formate (NH4)2S2O8/HCO2Na), is described. The reaction proceeds smoothly in polar aprotic solvents. The presence of functional groups like sodium carboxylate or sulfonate in the polyfluoroalkyl chloride appear to facilitate the reaction. The reaction appears to be initiated by a single-electron transfer, represents the first example of the reactivity of per(poly)fluoroalkyl chlorides, and also demonstrates their use as per(poly)fluoroalkylating agents. For alpha-chloro-omega-iodoperfluoroalkanes only the carbon-iodine bond is cleaved during the reaction. An explanation for the apparent stability of the carbon-chlorine bond in such compounds is given.
Method for absorbing and recovering fluorine-containing emulsifier
申请人:ASAHI GLASS COMPANY LTD.
公开号:EP1314700A1
公开(公告)日:2003-05-28
A method for adsorbing and recovering a fluorine-containing emulsifier at a high recovery from coagulation waste water of a fluoropolymer, is presented. An inorganic acid is added to coagulation waste water of a fluoropolymer containing a fluorine-containing emulsifier, to adjust the pH of the waste water to a level of at least 1 and less than 6, then a metal chloride having a solubility of at least 5 mass% in water at 25°C, or a hydrate of the metal chloride, is added to the waste water, to coagulate and remove a solid content and/or a substance convertible to a solid content, contained in the waste water, and then the waste water is contacted to a weakly basic anion exchange resin.
PROCESS FOR THE RECOVERY OF FLUORINE-CONTAINING EMULSIFIERS
申请人:Sasakura Engineering Co. Ltd.
公开号:EP1514848A1
公开(公告)日:2005-03-16
An aqueous solution containing a fluorine-containing emulsifier in a low concentration of at least 1 ppm by mass and at most 1% by mass (e.g., coagulation waste water after an emulsion polymerization of a fluoropolymer and/or an aqueous solution obtained by washing with an aqueous solution a waste gas from a drying process and/or a heat treating process of the fluoropolymer) is subjected to vacuum concentration under a pressure of at most 100 kPa and a temperature of the aqueous solution of at most 100°C by means of a heating tube surface evaporation type concentrator equipped with a heat pump or the like, and the fluorine-containing emulsifier is recovered from a highly concentrated aqueous solution containing the fluorine-containing emulsifier in a higher concentration of at least 5% by mass. According to the present method, the fluorine-containing emulsifier can be recovered with a high yield from a low-concentration liquid such as coagulation waste water of a fluoropolymer.
Method for recovering fluorine-containing emulsifier
申请人:Funaki Hiroshi
公开号:US20050150833A1
公开(公告)日:2005-07-14
An aqueous solution containing a fluorine-containing emulsifier in a low concentration of at least 1 ppm by mass and at most 1% by mass (e.g., coagulation waste water after an emulsion polymerization of a fluoropolymer and/or an aqueous solution obtained by washing with an aqueous solution a waste gas from a drying process and/or a heat treating process of the fluoropolymer) is subjected to vacuum concentration under a pressure of at most 100 kPa and a temperature of the aqueous solution of at most 100° C. by means of a heating tube surface evaporation type concentrator equipped with a heat pump or the like, and the fluorine-containing emulsifier is recovered from a highly concentrated aqueous solution containing the fluorine-containing emulsifier in a higher concentration of at least 5% by mass. According to the present method, the fluorine-containing emulsifier can be recovered with a high yield from a low-concentration liquid such as coagulation waste water of a fluoropolymer.
US7351342B2
申请人:——
公开号:US7351342B2
公开(公告)日:2008-04-01
A redox-initiated per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides
作者:Changming Hu、Fengling Qing
DOI:10.1021/jo00022a025
日期:1991.10
The per(poly)fluoroalkylation of olefins by per(poly)fluoroalkyl chlorides, initiated by ammonium persulfate/sodium formate (NH4)2S2O8/HCO2Na), is described. The reaction proceeds smoothly in polar aprotic solvents. The presence of functional groups like sodium carboxylate or sulfonate in the polyfluoroalkyl chloride appear to facilitate the reaction. The reaction appears to be initiated by a single-electron transfer, represents the first example of the reactivity of per(poly)fluoroalkyl chlorides, and also demonstrates their use as per(poly)fluoroalkylating agents. For alpha-chloro-omega-iodoperfluoroalkanes only the carbon-iodine bond is cleaved during the reaction. An explanation for the apparent stability of the carbon-chlorine bond in such compounds is given.