Patent ID: 6565753
Filing Date: 2003-05-20
Classification: C07C

Abstract:
A method of purification of a deicing fluid comprising glycol and a polymer thickener, and optionally anionic tensides, and petroleum products for the recovery of glycol, the method comprsing:adding Fe2(SO4)3 to the deicing fluid as a flocculating agent; maintaining, after the adding of the Fe2(SO4)3, the pH of the deicing fluid within the range of pH 3.2-4.8; mixing the deicing fluid and the Fe2(SO4)3; separating solid particles and flocculated material including said polymer thickener from the deicing fluid; separating dissolved organic compounds and positive and negative ions from the deicing fluid via an ion exchanger; and separating water from the deicing fluid by means of distillation.