Method and apparatus for purifying water solutions of glycol-based substances

摘要

The invention relates to a method and an apparatus for purification of water solutions of coolants and similar glycol-based substances such as di- or polyvalent alcohols e.g. from internal combustion engines making it possible to collect and purify the coolant for the purpose of recycling as the apparatus contains a preliminary chemical treatment with sodium diethyldithiocarbamate and a polyquarternary ammonium compound in its hydroxide form, means of filtration comprising an initial filtration apparatus for particle filtration of the preliminary treated coolant by using two or more serially arranged filters with decreasing pore size and a second filtration apparatus for filtration of the filtered coolant for removal of pollutants dissolved in the particle filtrated coolant and pumps for circulation of the substance through the preliminary treatment and the filtration processes. In this manner, it is possible to carry out a simple and efficient recycling process purifying used coolants within a relatively short period of time since the process is carried out by making one single circulation and at great speed since recirculation is superfluous.