Daikin Industries, Ltd.

Satoru Kohno

Takashi Shibanuma

Hirokazu Aoyama

Satoshi Koyama

Yohnosuke Ohsaka

Takashi Tohzuka

Shoji Takaki

Yoshio Negishi

A method for efficiently separating pentafluoroethane (HFC-125) from a mixture thereof with chloropentafluoroethane (CFC-115). This method is performed by subjecting a mixture ( ) of HFC-125 ( ) and CFC-115 ( ) to extractive distillation ( ) to give highly concentrated HFC-125 ( ). A hydrofluorocarbon compound ( ) having two carbon atoms, particularly 1,1,1,2-tetrafluoroethane, is used as an extractant to obtain concentrated CFC-115 as a distillate and a mixture of HFC-125 having a reduced content of CFC-115 with the extractant as a bottom ( ), the extractant being separated from HFC-124 in this mixture by distillation ( ) and reused in the extractive distillation.

Process for preparing pentafluoroethane

Process for the preparation of pentafluoroethane

Process for recovering pentafluoroethane

Purification methods of pentafluoroethane

Method for preparing dichlorodecafluoropentane and decafluoropentane

2,2,3-trifluoropropionyl fluoride is prepared by opening the ring of tetrafluorooxetane in the presence of a catalyst. Analogously, a novel 2,2-difluoropropionic acid derivative of the formula:

2,2-difluoropropionic acid derivatives

Growing community of inventors

Settsu, Japan

Satoru Kohno