PROCESS FOR DEHYDRATION OF HEXAFLUOROACETONE HYDRATE

摘要

[PROBLEMS] To provide a process for producing anhydrous hexafluoroacetone from hexafluoroacetone hydrate and to provide an environment-friendly process capable of dispensing with the disposal of waste sulfuric acid containing organic substances which disposal is essential to conventional processes with concentrated or fuming sulfuric acid. [MEANS FOR SOLVING PROBLEMS] A process for dehydration of hexafluoroacetone hydrate which comprises introducing hexafluoroacetone hydrate and hydrogen fluoride either as a mixture or separately into a distilling column and recovering a composition containing hexafluoroacetone or hexafluoro- acetone/hydrogen fluoride adduct and hydrogen fluoride as a lower boiling fraction while recovering a composition containing water and hydrogen fluoride as a higher boiling fraction.