| abstract |
A first step of reacting 1,1,1,3,3-pentachloropropane with hydrogen fluoride in the gas phase to obtain 1,1,1-trifluoro-3-chloro-2-propene; and then in the gas phase And a second step of reacting 1,1,1-trifluoro-3-chloro-2-propene with hydrogen fluoride to obtain 1,1,1,3,3-pentafluoropropane. Of 1,1,1,1,3,3-pentafluoropropane obtained by feeding mainly 1,1,1-trifluoro-3-chloro-2-propene obtained in the second step after byproduct hydrogen chloride removal Way.n n n It is possible to provide economically novel methods for preparing 1,1,1,3,3-pentafluoropropane in good yield or selectivity. |