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Decomposition of Chlorofluorocarbons Using a Thermal Plasma

Research Project

Project/Area Number 02650678
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 化学工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

KANZAWA Atushi  Tokyo Institute of Technology, Dept. Chem. Eng., Professor, 工学部, 教授 (80010908)

Co-Investigator(Kenkyū-buntansha) SEKIGUCHI Hidetoshi  Tokyo Institute of Technology, Dept. Chem. Eng., Research Associate, 工学部, 助手 (50226643)
WATANABE Takayuki  Tokyo Institute of Technology, Dept. Chem. Eng., Research Associate, 工学部, 助手 (40191770)
HONDA Takuya  Tokyo Institute of Technology, Dept. Chem. Eng., Associate Professor, 工学部, 助教授 (10016595)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsThermal plasma / Freon decomposition / Equilibrium / Numerical analysis / フロン / 熱プラズマ分解 / 水素添加 / 酸素添加
Research Abstract

The decomposition of CCl_2F_2 was studied using a thermal argon plasma. Thermodynamic calculations were performed to obtain the informations about the products. In the calculations, 73 species were considered in the four kinds of the reaction systems : C-Cl-F-Ar, C-Cl-F-H-Ar, C-Cl-F-O-Ar, and C-Cl-F-H-O-Ar which respectively corresponded to CCl_2F_2 decomposition without gas addition, with H_2, with O_2, and with H_2 and O_2 or H_2O. The results indicated that the simultaneous addition of H_2 and O_2 was effective for the decomposition of CCl_2F_2 since HF, HCL, and CO_2 or CO were dominant in C-Cl-F-H-O-Ar reaction system.
The numerical calculations were also performed in C-Cl-F-H-O-Ar reaction system with the assumptions of one dimensional flow, 26 species, and 60 step reactions. The results showed as follows : CCl_2F_2 was decomposed rapidly. When the reaction gases of CCl_2F_2, H_2, and O_2 were fed in the ratios 1 : 2 : 1, the product gases consisted of CO, CO_2, H_2, HF, HCl, and Cl_2, which was similar to the results of the water addition. An excess of H_2 suppressed the formation of Cl_2. While CO, HF, and HCL were produced when the ratio of CCl_2F_2 : H_2 : O_2 was 1 : 2 : 0.5.
The experimental studies were carried out using Ar plasma jet generated by d. c. arc discharge at atmospheric pressure. The experimental results showed that CCl_2F_2 was completely decomposed and converted to CO and CO_2 with the addition of H_2 and O_2. However the conversions about the components of Cl and F were not investigated, thus the further analyses must be carried out.
These results mentioned above confirmed that the thermal plasma methods was useful to decompose CCl_2F_2 rapidly and abundantly.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report

Research Products

(9 results)

All Other

All Publications (9 results)

  • [Publications] Hidetoshi Sekiguchi: "Deconposition of Chlorofluorocarbons Using a Thermal Argon Plasma" Proc.Int.Symp.Plasma Chem.(10th). 2. 1.5-2 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 関口 秀俊: "熱プラズマを用いたフロンの分解" 化学工学会第57年会予稿集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] オゾン層破壊物質破壊技術委員会編: "Destruction Techrologies of Substances That Deplete the Stratosheric Ozone Layer" オゾン層保護対策産業協議会, 53-56 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hidetoshi Sekiguchi: ""Decomposition of Chlorofluorocarbons Using a Thermal Argon Plasma"" Proc. 10th Inst. Symp. Plasma Chem.2. 1.5-2 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hidetoshi Sekiguchi: ""Decomposition of Chlorofluorocarbons Using a Thermal Argon Plasma"" Proc. 56th Annual Meeting of Soc. Chem. Eng. Jpn.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Japanese Committee of Technologies for Destruction of Substances That Deplete the Stratospheric Ozone Layer: ""Destruction Technologies of Substances That Deplete the Stratospheric Ozone Layer"" Japan Industrial Conference for Ozone Layer Protection. 53-56 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hidetoshi Sekiguchi: "Decomposition of Chlorofluorocarbons Using a Thermal Argon Plasma" Proc.Int.Symp.Plasma Chem.(10th). 2. 1.5-2 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 関口 秀俊: "熱プラズマを用いたフロンの分解" 化学工学会第57年会予稿集. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] オゾン層破壊物質破壊技術委員会編: "Destruction Technologies of Substances That Deplete the Stratospheric Ozone Layer" オゾン層保護対策産業協議会, 53-56 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1990-03-31   Modified: 2016-04-21  

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