Aqueous solutions of polymers are used for heat treatment, mainly for
quenching steers. The most popular and universally used are quenching
liquids of the UCON A, E, XT types based on various polyalkylene glyco
ls. In the course of operation these Liquids are contaminated by salts
retained on the surface of the parts after their heating salt baths,
by ions of heavy metals present in the solution, etc. The paper is dev
oted to the most popular method for cleaning polymer quenching media,
namely, the method of thermal separation.