| Project/Area Number |
07555232
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
化学工学一般
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| Research Institution | Tohoku University |
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Principal Investigator |
AZIRI Tadafumi Tohoku Univ.Faculty of Engineering, Assoc.Prof., 工学部, 助教授 (60182995)
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| Co-Investigator(Kenkyū-buntansha) |
KOSAKATA Kunio Teijin Co.Manager, エンジニアリンク部, 環境技術部長
SAKAI Kouichi Coca Cola Bottlers, 樹脂技術生産部, 部員
FUKUZATO Ryuichi Kobe steel inc.Manager, 環境開発部, 部長
LEE Richard Smith Tohoku Univ.Faculty of Engineering, Assoc.Prof., 工学部, 助教授 (60261583)
ARAI Kunio Tohoku Univ.Faculty of Engineering, Professor, 工学部, 教授 (10005457)
小坂田 国雄 日本コカコーラ(株), エンジニアリング部, 環境技術部長
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 1996: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1995: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | Supercritical water / terephthalic acid / PET / hydrolysis / mechanism / recycle / スラリー / モノマー / 分解 |
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| Research Abstract |
For the development of a new process of PET decomposition in supercritical water to recover telephthalic acid wihch is a raw material for producing PET,some basic studies were conducted. First, mechanism of the reaction was studied by using a tube bomb reactor. Hydrolysis of PET to produce telephthalic acid and ethyleneglycol took place in both sub and supercritical water. In supercritical condition (673 K,40 MPa), PET could be decomposed in 5 min. The yield of telephthalic acid whose purity was 97% reached to 91% at the reaction time of 12.5 min. Reaction temperature influenced signifidantly the PET decomposition. At 573 K,it took around 90 min for the 90% of telephthalic acid recovery. Supercritical condition, the effect of pressure on the reaction was significant. With increasing reaction pressure, char formation could be suppressed. Carbon dioxide production during the PET decomposition which is probably due to the decarboxylation from telephthalic acid, has been also suppressed. Besides this fundamental study for the PET decomposition, development of slurry feeder was also conducted and thus the basis of the continuous reaction has established. We think the process of non catalytic hydrolysis of PET in supercritical water will be a promising method for the chemical recycle, since 1) this require no waste water treatment, 2) purification of terlephthalic acid can be done during the cooling process after the PET hydrolysis.
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