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The Development of Recycling Process of Waste PET to TPA and Oxalic Acid by Alkaline Hydrolysis-oxidation

Research Project

Project/Area Number 07558082
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 環境保全
Research InstitutionTohoku University

Principal Investigator

OKUWAKI Akitsugu  Faculty of Engineering, Tohoku University Professor, 工学部, 教授 (70005320)

Co-Investigator(Kenkyū-buntansha) SAITO Hidefumi  Research & Development Senior Research Scientist Center, Nippon Kasei Chemical C, 企画開発本部研究所, 主任研究員
YOSHIOKA Toshiaki  Faculty of Engineering, Tohoku University Research Asociate, 工学部, 助手 (30241532)
齊藤 秀史  日本化成(株), 企画開発本部研究所, 主任研究員
斉藤 秀史  日本化成(株), 企画開発本部研究所, 主任研究員
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥9,800,000 (Direct Cost: ¥9,800,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1995: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsWaste PET / Alkaline Hydrolysis / Oxygen-oxidation / Recycling / Terephthalic Acid / Oxalic Acid
Research Abstract

Recently, a disposal of waste materials has been in current focus as one of the environmental problems familiar to every people, since it is difficult to set up intermediate treatment plants as an incinerator or the land for reclamation in the world. Polyethylene terephthalate (PET) resin is used not only in many industries but also in daily life, since it is inexpensive, light, transparent, tough and easy in processing. In particular, it is used for bottles, the demand for which is increasing year by year.
In this work, used PET flakes were oxidized by oxygen in NaOH solutions. In this case, PET was converted to terephthalic acid (TPA) and ethylene glycol (EG) by the hydrolysis, and only EG was oxidized simultaneously to oxalic acid. This is the first study recycling of used PET to TPA and oxalic acid particular. The optimum conditions were investigated to obtain oxalic acid in high yield from used PET flakes.
Oxidation of post consumer PET to TPA and oxalic acid in NaOH solutions was studied to disclose the optimum conditions. PET was completely hydolyzed first to TPA and EG during heating, and oxalic acid and CO_2 were formed by oxygen introduction. Since sparingly soluble sodium terephthalate in concentrated NaOH solutions is stable to the oxidation, the yield of TPA was reached ca.100unit% under all conditions. On the other hand, EG was oxidized to oxalic acid by base-catalyzed oxygen-oxidation and the maximum yield of oxalic acid was 60.7 unit%. Also, the yields of oxalic acid for commercial transparent flakes and mixture of transparent and green-colored flakes from PET bottles reached 65.9 unit% and 71.4 unit%, respectively.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Toshiaki Yoshioka: "Chemical Recycling of Post Consumer PET Powder by Hydrolysis and Simultaneous Oxidation in Nitric Acid" Proc.the 3rd Int.Sym.on East Asian Resources Recycling Tech.519-525 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 吉岡敏明: "NaOH水溶液中酸素酸化による廃PET樹脂のケミカルリサイクルング(2)" 廃棄物学会研究論文集. 392-394 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akitsugu Okuwaki: "FEED STOCK RECYCLING OF WASTE PET BOTTLES TO TEREPHTHALIC ACID AND OXALIC ACID BY SIMULTANEOUS HYDROLYSIS AND OXIDATION" Proc.14th IUPAC CONFERENCE ON CHEMICAL THERMODYNAMICS,OSAKA. 555-555 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 奥脇昭嗣: "廃プラスチックの再利用技術" 第21回環境工学連合会講演論文集. 21-26 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Yoshioka, N.Okayama and A.Okuwaki, Chemical Recycling of Post Consumer PET Powder by Hydrolysis and Simultaneous Oxidation in Nitric Acid.: Proc. The 3rd Int. Symp. on Eastt Asian Resources Recycling Tech. 519-525 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Yoshioka, Y.Kamiya, M.Saito and A.Okuwaki: "Chemical Recycling of Waste PET by Hydrolysis-oxygen-oxidation in NaOH solution(2)" Proc. The 7th Annual Conference of Japan Society of Waste Management Experts. 392-394 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akitsugu Okuwaki: "FEED STOCK RECYCLING OF WASTE PET BOTTLES TO TEREPHTHALIC ACID AND OXALIC ACID BY SIMULTANEOUS HYDROLYSIS AND OXIDATION" Proc. 14th IUPAC CONFERENCE ON CHEMICAL THERMODYNAMICS,OSAKA. 555 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akitsugu OKUWAKI: "RECYCLING TECHNOLOGY FOR WASTE PLASTICS" Proc. The 12th Nationnal Congress for Environmental Studies. 21-26 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Toshiaki Yoshioka: "Chemical Recycling of Post Consumer PET Powder by Hydrolysis and Simultaneous Oxidation in Nitric Acid." Proc. the 3rd Int. Sym. on East Asian Resources Recycling Tech.519-525 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 吉岡 敏明: "NaOH水溶液中酸素酸化による廃PET樹脂のケミカルリサイクルング(2)" 廃棄物学会研究論文集. 392-394 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Akitsugu Okuwaki: "FEED STOCK RECYCLING OF WASTE PET BOTTLES TO TEREPHTHALIC ACID AND OXALIC ACID BY SIMULTANEOUSHYDROLYSIS AND OXIDATION" Proc. 14th IUPAC CONFERENCE ON CHEMICAL TERMODYNAMICS. OSAKA. 555-555 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 奥脇 昭嗣: "廃プラスチックの再利用技術" 第12回環境工学連合会講演論文集. 21-26 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 奥脇昭嗣: "高温水中におけるPVCおよびPETのケミカルリサイクリング" 化学工学. 59. 814-815 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Yoshioka, N. Okayama and A.Okuwaki: "Chemical Recycling of Post Consumer PET powder by Hydrolysis and Simultaneous Oxidation in Nitric Acid" Proc. The 3rd. Int. Symp. on East Asian Resources Recycling Technology. 519-525 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Yoshioka, N. Okayama and A. Okuwaki: "Hydrolysis Mechanism of Waste PET Powder in Nitric Acid" Proc. 1995 Inter. Chem. Congress of Pacific Basin Soc.432-432 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2017-10-11  

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