Abstract
The co-hydrothermal carbonization (Co-HTC) of polyvinyl chloride (PVC) film and wood chip (WC) was conducted at 200-260oC in an autoclave filled in air or nitrogen for the chemical recycling of wastes with dechlorination of PVC. Effects of the Co-HTC temperature and the oxidation reaction during the Co-HTC on the decomposition behaviors were investigated. The percentage decomposition in nitrogen atmosphere increased with increasing the reaction temperature and reached 76.1% at 260oC. The percentage decompositions in nitrogen were several percent higher than those in air. The synergistic effect of PVC and WC for the decomposition was observed at 220oC in N2. When the Co-HTC was performed in air, decomposition was suppressed, indicating the increase in hydrochar yield. The dechlorination yield was determined from the Cl content in the recovered PVC after the Co-HTC reaction. Under nitrogen atmosphere conditions, the dechlorination yield increased slightly with increasing the temperature. At a carbonization temperature of 260oC, the dechlorination yield of PVC was about 40%.
Highlights
The treatment method of waste polyvinyl chloride (PVC) resins discarded from industrial, agricultural, and architectural fields has been established through material recycling in Japan
[5] In Hydrothermal carbonization (HTC) treatment, solid waste such as waste plastics and biomass are heat-treated in subcritical water
The smooth surface becomes rough after co-hydrothermal carbonization (Co-HTC) process
Summary
The treatment method of waste polyvinyl chloride (PVC) resins discarded from industrial, agricultural, and architectural fields has been established through material recycling in Japan. Previous studies have shown that 50-90% of carbon contained in the feedstock remains in the hydrochar which was produced by HTC. To realize the waste PVC treatment process, Co-HTC of biomass and the commercial PVC resin containing the plasticizers or other additives have to be investigated. Effects of reaction temperature and oxygen atmosphere on the behaviours of the decomposition and the dechlorination were investigated.
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