The chemical recycling of flexible polyurethane foam wastes are performed through hydroglycolysis process under microwave irradiation at atmospheric pressure and 160°C. Mixtures of glycerin, water, and sodium hydroxide are used as hydroglycolysis agent. Water is added at different ratios containing 5, 10, 15, 20, 25, 30, 35, and 40% of solvent system. The effect of water in the foam dissolution rate as well as water content of final recovered polyol is investigated. Finally FT-IR and NMR spectroscopy of the recycled polyol is performed and compared with virgin polyol.
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Nikje et al. (2008) studied this question.
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