METHOD FOR SEPARATING AND RECOVERING ACIDS FROM WASTE LIQUID MIXED WITH PLURALITY OF ACIDS

摘要

PROBLEM TO BE SOLVED: To provide a method for separating and recovering acids from a mixed acid waste liquid, capable of individually separating respective acids from the mixed acid waste liquid to recover them in a sufficiently reutilizable state, preventing the discharge of wastewater in which acetate, nitrate or the like are present and capable of sufficiently corresponding to the request of the protection of global environment. SOLUTION: An 8-12C alcohol is used with respect to a mixed acid waste liquid wherein acetic acid and nitric acid or hydrofluoric acid are mixed as an extractant to separate and recover acetic acid. Phosphoric ester is used in the mixed acid waste liquid mixed with nitric acid and hydrofluoric acid as an extractant to separate and recover acetic acid. The 8-12C alcohol and phosphoric ester are individually used in the mixed acid waste liquid containing acetic acid, nitric acid and phospheric acid as extractants to separate and recover the respective acids.