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A complete depolymerization of scrap tire with supercritical water participation: A molecular dynamic simulation
Shuo Yan1, Dehong Xia2, Xinru Zhang3
1School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Waste Management (New York, N.Y.)
|June 26, 2019
Summary
Supercritical water depolymerization efficiently converts scrap tires into valuable fuels like oil and gas. This process, utilizing hydroxyl radicals, offers a sustainable solution for tire waste management.
Area of Science:
- Environmental Science
- Chemical Engineering
- Materials Science
Background:
- Scrap tire accumulation presents a significant global environmental challenge.
- Developing effective recycling and valorization methods for scrap tires is crucial.
Purpose of the Study:
- To investigate the depolymerization of scrap tires in supercritical water.
- To elucidate the reaction pathways and mechanisms involved.
- To identify optimal conditions for producing valuable products.
Main Methods:
- ReaxFF molecular dynamics simulations were employed to study the depolymerization process.
- The interaction between scrap tire components and supercritical water was modeled.
- Reaction kinetics and product distribution were analyzed.
Main Results:
- Supercritical water facilitates rubber depolymerization by releasing hydroxyl radicals.
- Over 95% of organic components were converted into fuel oil and gas.
- The primary oil product was low-viscosity light oil, with gas products including H2, CO, and C1-C4 hydrocarbons.
- Optimal temperature for maximizing oil yield was determined to be 647-659 K.
Conclusions:
- Supercritical water is a feasible medium for recovering valuable chemical products from scrap tires.
- The study provides theoretical support for the industrial application of this technology.
- Temperature control is key to directing product composition in scrap tire recycling.
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