Polyurethane Foam Chemical Recycling: Fast Acidolysis with Maleic Acid and Full Recovery of Polyol.

Autor:	Liu B; Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States., Westman Z; Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States., Richardson K; Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States., Lim D; Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States., Stottlemyer AL; The Dow Chemical Company, Midland, Michigan 48640, United States., Farmer T; The Dow Chemical Company, Midland, Michigan 48640, United States., Gillis P; The Dow Chemical Company, Midland, Michigan 48640, United States., Hooshyar N; The Dow Chemical Company, Herbert H Dowweg 5, Hoek 4542 NH,The Netherlands., Vlcek V; Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States., Christopher P; Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States., Abu-Omar MM; Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States.; Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States.
Jazyk:	angličtina
Zdroj:	ACS sustainable chemistry & engineering [ACS Sustain Chem Eng] 2024 Mar 07; Vol. 12 (11), pp. 4435-4443. Date of Electronic Publication: 2024 Mar 07 (Print Publication: 2024).
DOI:	10.1021/acssuschemeng.3c07040
Abstrakt:	Chemical recycling of polyurethane (PU) waste is essential to displace the need for virgin polyol production and enable sustainable PU production. Currently, less than 20% of PU waste is downcycled through rebinding to lower value products than the original PU. Chemical recycling of PU waste often requires significant input of materials like solvents and slow reaction rates. Here, we report the fast (<10 min) and solvent-free acidolysis of a model toluene diisocyanate (TDI)-based flexible polyurethane foam (PUF) at <200 °C using maleic acid (MA) with a recovery of recycled polyol (repolyol) in 95% isolated yield. After workup (hydrolysis of repolyl ester and separations), the repolyol exhibits favorable physical properties that are comparable to the virgin polyol; these include 54.1 mg KOH/g OH number and 624 cSt viscosity. Overall, 80% by weight of the input PUF is isolated into two clean-cut fractions containing the repolyol and toluene diamine (TDA). Finally, end-of-life (EOL) mattress PUF waste is recycled successfully with high recovery of repolyol using MA acidolysis. The solvent-free and fast acidolysis with MA demonstrated in this work with both model and EOL PUF provides a potential pathway for sustainable and closed-loop PU production. Competing Interests: The authors declare the following competing financial interest(s): A.S., T.F., P.G., and N.H. are employees of The Dow Chemical Company. (© 2024 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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