METHOD FOR THE RECYCLING OF POLYURETHANE MATERIAL WASTE FOR THE PRODUCTION OF CHEMICAL RAW MATERIALS FOR THE PRODUCTION OF ISOCYANATES AND POLYURETHANES

摘要

A process is described for recycling polyurethane material waste (18 a) for the production of chemical raw materials for the production of isocyanates (10 a) and then polyurethanes (16 a), in which, starting from polyurethane material waste (18 a) by pyrolysis (1) Carbon dioxide (1a) and hydrocarbons (1c) are generated, the carbon dioxide (1a; 4a) is converted into carbon monoxide (7b) and possibly hydrogen (7a) by electrolysis (5), the carbon monoxide (7b; 7c) obtained is transferred via Phosgene is converted to isocyanate (10 a) and the isocyanate (10 a) can be further processed into new polyurethane material (16 a).