With the development of the plastics industry and the applications of plastic products, plastic waste disposal has become a difficult problem, during which the white pollution has become a global scourge. Polystyrene (PS) and expanded polystyrene (EPS) are the most widely used plastics, As far as the situation of our country is concerned, the non-toxic or low toxic solvent which can quickly dissolve polystyrene foam is selected which could convert the waste polystyrene foam into useful material. In this wor...