Decomposition of cutting-edge fluorinated materials using superheated water in the presence of metal oxides

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H03402
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 64020:Environmental load reduction and remediation-related
• Research Institution: Kanagawa University
• Principal Investigator: Hori Hisao 神奈川大学, 理学部, 教授 (50357951)
• Co-Investigator(Kenkyū-buntansha): 永長 久寛 九州大学, 総合理工学研究院, 教授 (90356593)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: フッ素 / 分解 / ポリマー / リサイクル / イオン液体 / フッ素樹脂

Outline of Final Research Achievements

Fluorinated materials are used in many industrial applications owing to their high chemical and thermal stability and other specific characters. In the present work, decompositions of melt-processable fluoropolymers [i.e., poly(vinylidene fluoride)(PVDF), VDF-related copolymers, and ethylene-tetrafluoroethylene copolymer (ETFE)], fluorinated ionic liquids, and other high-valued fluorinated compounds, were investigated by means of superheated water reactions. By use of potassium permanganate, these cutting-edge fluorinated materials were efficiently decomposed to form fluoride ions (i.e., mineralization) at relatively low temperatures (250-300 degrees).

Free Research Field

環境負荷物質の分解・無害化、再資源化

Academic Significance and Societal Importance of the Research Achievements

本研究は熱的、化学的に安定で、高い機能性を持ち、多くの産業で用いられる一方で、廃棄物の分解処理方法、さらにはリサイクル方法が確立していないフッ素材料について、過マンガン酸カリウムを添加した亜臨界水で処理すればフッ化物イオンまで効果的に分解できることを明らかにした。フッ化物イオンまで分解できれば、原料であるフッ化カルシウムに変換できるので、本研究はこれらの材料のリサイクル技術の開発に貢献するものである。