Method for recycling waste containing polyurethane material (18 a) for producing chemical feedstock for the production of isocyanates and polyurethanes by a) pyrolysis of the polyurethane material (18 a) at elevated temperature, optionally in the presence of a catalyst, to obtain a mixture of aliphatic and aromatic low molecular weight hydrocarbons and nitrogenous hydrocarbons, with or without carbon dioxide, with or without carbon monoxide, with or without hydrogen, and a residue of higher molecular weight carbon compounds, b) optionally refining the mixture of low molecular weight hydrocarbons obtained in step a) to obtain a mixture (19 a) of gaseous and liquid hydrocarbons and a mixture (19 b) of carbon dioxide and carbon monoxide, hydrogen and other gaseous hydrocarbon compounds, and separation of the resulting mixtures (19 b) in a gas separation 30 c) incinerating the residue obtained in step a) and optionally further polyurethane material waste (18 a) with oxygen-containing gas, in particular with pure oxygen, to obtain gas containing carbon dioxide, d) purifying the carbon dioxide and, obtained from step c) and possibly from step a), of secondary constituents, in particular nitrogen oxides, sulfur compounds, dust, water, oxygen and HCl, optionally by means of adsorption, gas scrubbing or catalytic treatment to obtain purified carbon dioxide, e) electrolysis of the purified carbon dioxide obtained in step d), in particular electrochemical conversion of the carbon dioxide at a gas diffusion electrode, to obtain a mixture of at least carbon monoxide, unconverted carbon dioxide and possibly hydrogen, f) separating the unconverted carbon dioxide from the mixture obtained in step e) to obtain a mixture of at least carbon monoxide and possibly hydrogen and recycling the unconverted carbon dioxide to the electrolysis, g) optionally separating the hydrogen possibly obtained from the mixture of carbon monoxide and possibly hydrogen obtained in step f), h) reacting the carbon monoxide or obtained from step g) or f) with chlorine to form phosgene in a process for producing isocyanate (10 a), i) optionally reacting the isocyanate (10 a) obtained from step h) with polyethers (15 a) and optionally additionally with polyester to give a finished polyurethane material (16 a). a) pyrolysis of the polyurethane material (18 a) at elevated temperature, optionally in the presence of a catalyst, to obtain a mixture of aliphatic and aromatic low molecular weight hydrocarbons and nitrogenous hydrocarbons, with or without carbon dioxide, with or without carbon monoxide, with or without hydrogen, and a residue of higher molecular weight carbon compounds, b) optionally refining the mixture of low molecular weight hydrocarbons obtained in step a) to obtain a mixture (19 a) of gaseous and liquid hydrocarbons and a mixture (19 b) of carbon dioxide and carbon monoxide, hydrogen and other gaseous hydrocarbon compounds, and separation of the resulting mixtures (19 b) in a gas separation 30 c) incinerating the residue obtained in step a) and optionally further polyurethane material waste (18 a) with oxygen-containing gas, in particular with pure oxygen, to obtain gas containing carbon dioxide, d) purifying the carbon dioxide and, obtained from step c) and possibly from step a), of secondary constituents, in particular nitrogen oxides, sulfur compounds, dust, water, oxygen and HCl, optionally by means of adsorption, gas scrubbing or catalytic treatment to obtain purified carbon dioxide, e) electrolysis of the purified carbon dioxide obtained in step d), in particular electrochemical conversion of the carbon dioxide at a gas diffusion electrode, to obtain a mixture of at least carbon monoxide, unconverted carbon dioxide and possibly hydrogen, f) separating the unconverted carbon dioxide from the mixture obtained in step e) to obtain a mixture of at least carbon monoxide and possibly hydrogen and recycling the unconverted carbon dioxide to the electrolysis, g) optionally separating the hydrogen possibly obtained from the mixture of carbon monoxide and possibly hydrogen obtained in step f), h) reacting the carbon monoxide or obtained from step g) or f) with chlorine to form phosgene in a process for producing isocyanate (10 a), i) optionally reacting the isocyanate (10 a) obtained from step h) with polyethers (15 a) and optionally additionally with polyester to give a finished polyurethane material (16 a).