Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 54, Issue 35, Pages 8650-8658Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.5b01716
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Funding
- Japan Society for the Promotion of Science [15H02841]
- Grants-in-Aid for Scientific Research [15H02841] Funding Source: KAKEN
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Decompositions of poly(vinylidene fluoride) (PVDF), poly(vinylidene fluoride-co-chlorotrifluoroethylene) copolymer (poly(VDF-co-CTFE)), and poly(vinylidene fluoride-co-hexafluoropropylene) copolymer (poly(VDF-co-HFP)) in subcritical water were investigated with the aim of developing a technique to recover the fluorine component. By use of H2O2, these (co)polymers can be efficiently mineralized at a relatively low temperature (300 degrees C). When PVDF was heated with 3.0 M H2O2 for 6 h, which corresponds to 31 times the molar amount of fluorine and 32 times the molar amount of carbon in the polymer, both F- and CO2 yields reached 98%. Poly(VDF-co-CTFE) copolymer was also mineralized under the same reaction conditions (the yields of F-, CO2, and Cl- were 98, 95, and 97%, respectively). Poly(VDF-co-HFP) copolymer was more readily decomposed than poly(VDF-co-CTFE), leading to almost complete mineralization (F- yield, 96%; CO2 yield, 92%) with 2.0 M H2O2. Addition of stoichiometric Ca(OH)(2) to the reactions formed CaF2 well-identified by X-ray diffraction spectrometry.
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