Showa Denko K.k.

Atsuo Nishimura

Reiji Takahashi

Masaaki Nishioka

Hidemitsu Takinishi

Shiro Fukuyama

Toshio Nagayasu

Hiromi Niitsu

A purification process of pentafluoroethane from a crude pentafluoroethane containing chloropentafluoroethane as a by-product by extractive distillation using an extracting reagent having a standard boiling point of from &minus;10&deg; C. to 100&deg; C. and being selected from paraffinic hydrocarbons, alcohols, ethers, esters, and ketones.

Purification process of pentrafluoroethane

A process for separating pentafluoroethane and 1,1,1-trifluoroethane, which comprises extraction distilling a mixed fluid comprising pentafluoroethane and 1,1,1-trifluoroethane in the presence of at least one extracting agent selected from the group consisting of esters and ketones each having a standard boiling point of from -10.degree. C. to 100.degree. C. Also disclosed is a process for separating pentafluoroethane, 1,1,1-trifluoroethane and chloropentafluoroethane, which comprises extraction distilling a mixed fluid comprising pentafluoroethane, 1,1,1-trifluoroethane and chloropentafluoroethane in the presence of at least one extracting agent selected from the group consisting of esters and ketones each having a standard boiling point of from -10.degree. C. to 100.degree. C.

Process for separating pentafluoroethane and 1,1,1-trifluoroethane

A random copolymer comprising, as repeating units,

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Kanagawa, Japan

Atsuo Nishimura