METHOD FOR THE RECYCLING OF POLYURETHANE MATERIAL WASTE FOR PRODUCING CHEMICAL FEEDSTOCK FOR THE PRODUCTION OF ISOCYANATES AND POLYURETHANES
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United States of America Patent
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Jul 21, 2022
app pub date -
May 26, 2020
filing date -
May 27, 2019
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Abstract
The invention relates to a method for recycling polyurethane material waste (18a) for producing chemical feedstock for the production of isocyanates (10a) and then polyurethanes (16a), in which method, proceeding from polyurethane material waste (18a), carbon dioxide (1a) and hydrocarbons (1c) are generated by pyrolysis (1), the carbon dioxide (1a; 4a) is converted by electrolysis (5) into carbon monoxide (7b) and hydrogen (7a), as appropriate, the carbon monoxide (7b; 7c) obtained is converted via phosgene to isocyanate (10a) and the isocyanate (10a) can be further processed into new polyurethane material (16a).
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