Patent
Purification of perfluoro(propylvinyl ether)
Reads0
Chats0
TLDR
In this paper, the authors proposed a method to purify perfluoro(propylvinyl ether) with effectively separating hydrogen fluoride adduct of the perfluoromethane by subjecting crude perfluore(propylene) to extractive distillation with using a specific ketone as a solvent, which is suitable for obtaining a copolymer with tetrafluoroethylene.Abstract:
PURPOSE:To purify perfluoro(propylvinyl ether) with effectively separating hydrogen fluoride adduct of the perfluoro(propylvinyl ether) by subjecting crude perfluoro(propylvinyl ether) to extractive distillation with using a specific ketone as a solvent. CONSTITUTION:Crude perfluoro(propylvinyl ether) containing hydrogen fluoride adduct of perfluoro(propylvinyl ether), generally crude perfluoro(propylvinyl ether) obtained by a thermo-decomposing method is subjected to extractive distillation using ketone having >=100 deg.C boiling point (e.g. methyl isobutyl ketone, 2-hexanone, 2-heptanone or acetonyl acetone) as a solvent to purify perfluoro(propylvinyl ether). Said compound is suitable for obtaining a copolymer with tetrafluoroethylene and improves moldability of the resultant copolymer.read more
Citations
More filters
Patent
Process for purification of perfluorovinyl ethers
Shigeru Morita,Toshihiko Amano +1 more
TL;DR: In this article, the authors proposed a method to remove the hydrogen fluoride adduct of a perfluorovinyl ether as an impurity and provide a high purity perfluorsovalvinyl ether.
Patent
Process for purifying perfluorovinyl ethers
Shigeru Morita,Toshihiko Amano +1 more
Abstract: A process for purifying impure perfluorovinyl ethers of the general formula: RfO(CF2CFXO)nCF=CF2 (1) (wherein Rf represents a perfluoroalkyl group, X represents a fluorine atom or a trifluoromethyl group, and n represents a number of 0 to 20) by distillation to remove hydrogen fluoride adducts of the ethers as the impurity, wherein the perfluorovinyl ether (1) is distilled in the presence of a ketone or ether having a boiling point lower than that of the perfluorovinyl ether (1) while refluxing the ketone or ether, thus yielding a highly pure perfluorovinyl ether.