Chemical upcycling of polyethylene, polypropylene, and mixtures to high-value surfactants

Xu, Zhen; Munyaneza, Nuwayo Eric; Zhang, Qikun; Sun, Mengqi; Posada, Carlos; Venturo, Paul; Rorrer, Nicholas A.; Miscall, Joel; Sumpter, Bobby G.; Liu, Guoliang

doi:10.1126/science.adh0993

Title: Chemical upcycling of polyethylene, polypropylene, and mixtures to high-value surfactants

Journal Article · 09 August 2023 · Science

DOI: https://doi.org/10.1126/science.adh0993 · OSTI ID:1995703

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Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Shandong Normal University (China)
National Renewable Energy Laboratory (NREL), Golden, CO (United States). Renewable Resources and Enabling Science Center
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Conversion of plastic wastes to fatty acids is an attractive means to supplement the sourcing of these high-value, high-volume chemicals. Here, we report a method for transforming polyethylene (PE) and polypropylene (PP) at ~80% conversion to fatty acids with number-average molar masses of up to ~700 and 670 daltons, respectively. The process is applicable to municipal PE and PP wastes and their mixtures. Temperature-gradient thermolysis is the key to controllably degrading PE and PP into waxes and inhibiting the production of small molecules. The waxes are upcycled to fatty acids by oxidation over manganese stearate and subsequent processing. PP β-scission produces more olefin wax and yields higher acid-number fatty acids than does PE β-scission. Furthermore, we convert the fatty acids to high-value, large–market-volume surfactants. Industrial-scale technoeconomic analysis suggests economic viability without the need for subsidies.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office (AMO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Contributing Organization:: BOTTLE Consortium

Grant/Contract Number:: AC05-00OR22725; AC36-08GO28308

OSTI ID:: 1995703

Journal Information:: Science, Journal Name: Science Journal Issue: 6658 Vol. 381; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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