Method for producing fluorinated alkane, separation of amidine base, recovery method, and use of recovered amidine base

摘要

The present invention relates to a method for producing a fluorine-containing polymer, which comprises reacting an alcohol having 3 to 5 carbon atoms with a fluorinating agent represented by the formula (1): R ¹ SO ₂ F in the presence of a base selected from the group consisting of an amidine base and a phosphazene base A method for producing a fluorinated alkane represented by the formula (2): R ² -F, which is fluorinated, an alkali aqueous solution is added to a solution obtained by dissolving an amidine base-sulfonic acid complex represented by the following formula (5) in an aromatic hydrocarbon, (I) precipitating an alkali metal sulfonate, adding water to a solution in which the alkali metal sulfonate is precipitated, dissolving the alkali metal sulfonate, dissolving the aqueous sodium sulfonate salt in an aqueous layer, (II) of removing an aqueous layer in which the alkali metal sulfonate is dissolved, and a room containing an amidine base obtained in the step (II) A method of separating and recovering an amidine base having a step (III) of distilling off aromatic hydrocarbons from the aromatic hydrocarbon solution; And, it is the method of using the recovered amidine base. (R ¹ represents a methyl group, an ethyl group or an aromatic group, R ² represents an alkyl group having 3 to 5 carbon atoms, and n represents 0 or 2.)