Glycolysis of rigid polyurethane foams is an efficient process for chemical recycling of waste products into raw materials. Secondary reactions leading, to some extent, to formation of amines are also involved in the process. The choice of catalyst is an important factor in selecting the type of reaction as well as the reaction rate. The best results are obtained with dipropylene glycol and potassium acetate. Reaction rates are high and a simple and easy process leads straight to raw materials that can be used without further treatment for the production of rigid methane foams. The properties of the foams are at least comparable to those of foams obtained from fresh polyols.
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