| 摘要 |
1,195,857. Recovering heptafluoro-isopropyl- 2<SP>1</SP>-iodo-tetrafluoroethyl ether. ALLIED CHEMICAL CORP. 25 Sept., 1967 [27 Sept., 1966], No. 43573/67. Addition to 1,165,912. Heading C2C. Heptafluoro - isopropyl - 2<SP>1</SP>- iodotetrafluoroethyl ether is recovered from a mixture thereof with acetonitrile in which the molar ratio of the acetonitrile to the other component is at least 2 : 1, by (i) fractionally distilling an azeotrope of the two components from the mixture and (ii) washing with water the distillate from (i) to extract the acetonitrile therefrom. |
