Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1998-04-15
1999-05-18
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568383, 568407, 568419, C07C45/00
Patent
active
059051744
ABSTRACT:
The invention relates to a method for producing 3,3-dichloro-1,1,1-trifluoroacetone. This method includes a step of fluorinating pentachloroacetone by hydrogen fluoride in the presence of a fluorination catalyst. This fluorination may be conducted in a liquid phase in the presence of an antimony compound as the fluorination catalyst. Alternatively, the fluorination may be conducted in a gas phase in the presence of a fluorination catalyst which may be a fluorinated alumina or at least one compound of at least one metal selected from Al, Cr, Mn, Ni, and Co. The method is suited to an industrial scale production of 3,3-dichloro-1,1,1-trifluoroacetone. The invention further relates to another method for producing 3,3-dichloro-1,1,1-trifluoroacetone. This method includes a step of purifying a crude 3,3-dichloro-1,1,1-trifluoroacetone by a distillation in the presence of water, thereby to produce 3,3-dichloro-1,1,1-trifluoroacetone which is substantially free of organic matters other than 3,3-dichloro-1,1,1-trifluoroacetone. This crude 3,3-dichloro-1,1,1-trifluoroacetone may be the reaction products of the fluorination of pentachloroacetone in a gas phase. Due to the provision of the another method, 3,3-dichloro-1,1,1-trifluoroacetone can be produced with high yield.
REFERENCES:
Yu Zeifman et al., "Polyfluorinated Al-Enolates," Doklady Akademii Nauk USSR (English Translation), vol. 307, No. 6, Aug. 1989, pp. 241-245.
J. Fernandez-Bolanos et al., "The Synthesis of 4, 5-bistrifluoromethylbenzimidazole," Journal of the Chemical Society, vol. 1960, 1960, pp. 4003-4010.
Goto Yoshihiko
Kanai Masatomi
Nadano Ryo
Sakaya Takashi
Watanabe Mineo
Central Glass Company Limited
Geist Gary
Padmanabhan Sreeni
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