Patent ID: 7423174

Claim:
A process for separating an acid from a system comprising the acid and an organic acid fluoride; the organic acid fluoride being represented by formula (I): RCOF (I) wherein R is a fluorine atom; a C 1-20 linear, branched or cyclic alkyl or halogenated alkyl group that may contain a heteroatom; or a C 6-20 aryl or halogenated aryl group that may contain a heteroatom; the acid being HF; the process comprising using as a deacidifying agent a polymer that has one or more aromatic heterocyclic groups having one or more nitrogen atoms as heteroatom having a boiling point of at least 50° C. and having one or more nitrogen atoms as heteroatom; and the resulting organic acid fluoride having a concomitant acid in a concentration of 100 mass ppm or less.