Basic study on treatment of waste polyvinyl chloride plastics by hydrothermal decomposition in subcritical and supercritical regions

Takeshita, Yukitoshi; Katō, Kiyoshi; Takahashi, Kazue; Satō, Yoshiyuki; Nishi, S.

doi:10.1016/j.supflu.2003.10.006

Cited by 123 publications

(85 citation statements)

References 15 publications

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“…5). Takeshita et al [30] reported that PVC was dehydrochlorinated by the zipper mechanism, in which the loss of HCl from a given two-carbon segment is facilitated by dehydrochlorination of an adjacent monomer unit. In the subcritical co-treatment process, HCl dissolved in water to become hydrochloric acid, inducing the rapid leaching of metals from the LiCoO 2 crystals.…”

Section: Gc-ms Analysis Of Oil Productsmentioning

confidence: 99%

Innovative leaching of cobalt and lithium from spent lithium-ion batteries and simultaneous dechlorination of polyvinyl chloride in subcritical water

Liu

Zhang

2016

Journal of Hazardous Materials

109

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h i g h l i g h t s• A co-treatment process for recovery of Co and Li and simultaneous detoxification of PVC in subcritical water was proposed.• PVC was used as a hydrochloric acid source.• More than 95% Co and nearly 98% Li were leached under the optimum conditions.• Neither corrosive acid nor reducing agent was used.• The co-treatment process has technical, economic and environmental benefits over the traditional recovery processes. a r t i c l e i n f o In this work, an effective and environmentally friendly process for the recovery of cobalt (Co) and lithium (Li) from spent lithium-ion batteries (LIBs) and simultaneously detoxification of polyvinyl chloride (PVC) in subcritical water was developed. Lithium cobalt oxide (LiCoO 2 ) power from spent LIBs and PVC were co-treated by subcritical water oxidation, in which PVC served as a hydrochloric acid source to promote metal leaching. The dechlorination of PVC and metal leaching was achieved simultaneously under subcritical water oxidation. More than 95% Co and nearly 98% Li were recovered under the optimum conditions: temperature 350• C, PVC/LiCoO 2 ratio 3:1, time 30 min, and a solid/liquid ratio 16:1 (g/L), respectively. Moreover, PVC was completely dechlorinated at temperatures above 350• C without any release of toxic chlorinated organic compounds. Assessment on economical and environmental impacts revealed that the PVC and LiCoO 2 subcritical co-treatment process had significant technical, economic and environmental benefits over the traditional hydrometallurgy and pyrometallurgy processes. This innovative co-treatment process is efficient, environmentally friendly and adequate for Co and Li recovery from spent LIBs and simultaneous dechlorination of PVC in subcritical water.

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Section: Gc-ms Analysis Of Oil Productsmentioning

confidence: 99%

Innovative leaching of cobalt and lithium from spent lithium-ion batteries and simultaneous dechlorination of polyvinyl chloride in subcritical water

Liu

Zhang

2016

Journal of Hazardous Materials

109

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“…It was reported that in this temperature region the dechlorination of PVC occurred by thermal degradation [26]. Takeshita et al [25] also reported that the PVC dechlorination was controlled by thermal degradation in water with saturated pressure. Similar behavior of PVC was observed in the presence of oxygen in our SBWO process.…”

Section: Dechlorination Behavior Of Pvc In Sbwo Processmentioning

confidence: 99%

“…Currently, PVC wastes are mainly incinerated for thermal recovery. However, the incineration of PVC can lead to the formation of chlorinated toxic organics such as dioxins [25,26]. Hence, it is important for PVC waste to be treated in a safe process.…”

Section: Introductionmentioning

confidence: 99%

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Xiu

Zhang

2014

Chemical Engineering Journal

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h i g h l i g h t sWe report an effective process for co-treatment of waste PCBs and PVC. Brominated flame retardants can be decomposed efficiently in co-treatment. Dechlorination of PVC was complete and safe. Cu and Pb in waste printed circuit boards can be recovered efficiently. Sn and Cr can be immobilized efficiently in the residue after co-treatment. t r a c tIn this work, an effective process for removal of brominated flame retardants (BFRs) and recovery of Cu and Pb from waste printed circuit boards (PCBs) was developed. In the process, waste PCBs and polyvinyl chloride (PVC) were co-treated by subcritical water oxidation (SBWO). PVC was used as a hydrochloric acid source and waste PCBs was used as a neutralizing reagent for the produced HCl. The dechlorination of PVC, removal of BFRs, and recovery of Cu and Pb could be achieved simultaneously by the one-step SBWO reaction. Experimental results showed that the dechlorination of PVC was complete when SBWO temperature exceeded 250°C. SBWO co-treatment was high efficient for the leaching of Cu and Pb from waste PCBs, and XRD spectra indicated that Sn was immobilized as SnO 2 in the residue after co-treatment. The optimum SBWO co-treatment conditions were temperature of 350°C, time of 60 min, solidliquid ratio of 1:9 g/ml, and PVC-to-PCBs ratio of 1:1, respectively. In the optimized co-treatment, 98.9% of Cu and 80% of Pb were recovered, while the leaching efficiencies of Sn and Cr were 15.3% and 3.9%, respectively. Meanwhile, approximately 100% of the bromine was changed into HBr and enriched in water after co-treatment.

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“…The gasification of waste plastic in supercritical water also attracted much attention. Supercritical water gasification of waste plastics and the model compounds (such as polyethylene) were investigated by many researchers (Watanabe et al, 1998;Watanabe et al, 2001;Shibasaki et al, 2004;Su et al, 2004;Takeshita et al, 2004;Su et al, 2007). The anaerobic organic wastewater from wheat straw includes acids (acetic acid, butyric acid) and ethanol etc.…”

Section: Organic Wastesmentioning

confidence: 99%

Supercritical Water Gasification of Biomass and Organic Wastes

Guo¹,

Chen²,

Lu³

2010

Biomass

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Basic study on treatment of waste polyvinyl chloride plastics by hydrothermal decomposition in subcritical and supercritical regions

Cited by 123 publications

References 15 publications

Innovative leaching of cobalt and lithium from spent lithium-ion batteries and simultaneous dechlorination of polyvinyl chloride in subcritical water

Innovative leaching of cobalt and lithium from spent lithium-ion batteries and simultaneous dechlorination of polyvinyl chloride in subcritical water

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Supercritical Water Gasification of Biomass and Organic Wastes

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