2002 Fiscal Year Final Research Report Summary
Photodechlorination of Sealed Chlorofluorocarbons As Reresouce Production Process
| Project/Area Number |
11555210
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
反応・分離工学
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| Research Institution | Hosei University |
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Principal Investigator |
NISHIUMI Hideo Hosei University, Faculty of Engineering, Professor, 工学部, 教授 (10005514)
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| Co-Investigator(Kenkyū-buntansha) |
MOCHIZUKI Toshiyuki Nippon Photo-Science Inc., Research Director, 環境装置部部長
SATO Koichi Hosei University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30061245)
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| Project Period (FY) |
1999 – 2002
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| Keywords | CFCl15 / fluorocarbon-atcohol systems / Henry constants / CFCl2 / Photo-chain reaction / HCFC22 / CH_3OCHF_2 / Volumetric coefficient |
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| Research Abstract |
1. Initial photo-decomposition reaction rate of C_2ClF_5 (CFCl15) increased with partial pressure of CFCl15, and was proportional to the root of photo absorption rate. It brought an initial photo-decomposition mechanism as a chain reaction.
2. Twenty one binary systems of fluorocarbons in alcohols were measured using a static method or a headspace gas chromatography. The results were well correlated as the Henry constants which were functions of temperature.
3. A consecutive reaction of CFCl2 → HCFC22 → CH_3OCHF_2 was studied. The vapor pressure of CH_3OCHF_2 was similar to that of HFC142b (C_2H_3ClF_2). Instead of HFCl42b, the ether may be used as a third generation refrigerant. The first reaction is photo-decomposition of CFCl2 (CCl_2F_2) maintaining vapor-liquid equilibria. The reaction rate was proportional to the root of photo absorption rate. It shows the reaction is a chain reaction. The second reaction occurs without UV irradiation. Reaction rate scheme was determined. It brought the two types of CH_3OCHF_2 fluoroether producing process.
4. Bubbling HCFC22 (CHClF_2) into methanol, reaction rate decreased. We thought that precipitation of NaCl disturbed mixing. Volumetric coefficient K_La was correlated as a function of concentration of NaCl. It agreed well with experimental data.
5. Use of Ca(OH)_2 or TiO_2-Ca(OH)_2 instead of NaCl was found to be effective in dechlorination of trichloroethylene.
6. At 250℃ and 12MPa, HCFC22 in methanol was decomposed to produce CF_2HOCF_2H without NaOH.
7. In INCHEM TKYO, we exhibited our results, "Dechlorination Process to Resources with Bubbling Tower" as a potential process to be commercial.
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[Publications] M.Takenouchi, R.Kato, H.Nishiumi: "Henry's Law Constant Measurements of CCl_2F_2, CHCIF_2, CH_2F_2, C_2CIF_5, C_2HF_5, CH_2FCF_3, and CH_3CHF_2 in Methanol, Ethanol, and 2-Propanol"J.Chem.Eng.Data. 46. 746-749 (2001)
Description
「研究成果報告書概要(和文)」より
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[Publications] M. Takenouchi, R. Kato, H. Nishiumi: "Henry's Law Constant Measurements of CCl_2F_2, CHClF_2, CH_2F_2, C_2ClF_5, C_2HF_5, CH_2FCF_3, and CH_3CHF_2 in Methanol, Ethanol, and 2-Propanol"J. Chem. Eng. Data. 46. 746-749 (2001)
Description
「研究成果報告書概要(欧文)」より
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