C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 19/08 (2006.01) B01J 27/08 (2006.01) B01J 27/125 (2006.01) B01J 27/135 (2006.01) C07C 17/278 (2006.01) C07C 17/28 (1990.01)
Patent
CA 2074515
- 41 - ABSTRACT The present invention relates to a simple method for producing 3,3-dichloro-1,1,1,2,2-pentafluoropropane (R225ca) and 1,3-dichloro-1,1,2,2,3-pentafluoropropane (R225cb) in good yield and at high selectivity by reacting tetrafluoroethylene (C2F4) and dichlorofluoromethane (R21) in the presence of a certain specific catalyst. The specific catalyst in the present invention is (1) a catalyst comprising halogenated oxide containing at least one element of Group 4, Group 5 and Group 13 such as Ti, Zr, Hf, V, B and Ga, or (2) a catalyst comprising halogenated oxide containing at least one element selected from Group 4, Group 5 and Group 13 such as Ti, Zr, Hf, V, B, Al and Ga and at least one element selected from Group 2, Group 6, Group 12 and Group 14 such as Ba, W, Zn, Si, Bi and P. Further, in the present invention, it is preferred to react C2F4 with R21 in such a state that C2F4 is in excess. According to the method of the present invention, it is possible to suppress formation of 2,2-dichloro- 1,1,1,3,3-pentafluoropropane (R225aa) and 2,3-dichloro- 1,1,1,2,3-pentafluoropropane (R225ba) as by-products. These by-product, R225aa and R225ba, have boiling points close to those of R225ca and R225cb, the desired products of the present invention, and they can hardly be - 42 - separated from R225ca and R225cb by a usual method such as distillation. Further, according to the method of the present invention, formation of chloroform (CHC13) can substantially be suppressed. This by-product CHC13 forms azeotope with R225ca and R225cb, thus it can hardly be separated from R225ca and R225cb. According to the method of the present invention, formation of the above-mentioned hardly separable impurities (R225aa, R225ba and CHC13) can be substantially suppressed, and therefore the method is excellent as a method for producing pure R225ca and R225cb.
Morikawa Shinsuke
Ohnishi Keiichi
Okamoto Hidekazu
Tanuma Toshihiro
Asahi Glass
Smart & Biggar
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