Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Decomposition of PET in High Pressure Subcritical Water

고압 아임계수 내에서 PET의 분해

  • Chung, Seung-Hee (School of Chemical Engineering and Bio Engineering, University of Ulsan) ;
  • Lee, Jung-Hoon (School of Chemical Engineering and Bio Engineering, University of Ulsan) ;
  • Shim, Jae-Jin (School of Chemical Engineering and Technology, Yeungnam University) ;
  • Kim, Jae-Seong (School of Chemical Engineering and Bio Engineering, University of Ulsan) ;
  • Kim, Sunwook (School of Chemical Engineering and Bio Engineering, University of Ulsan)
  • 정승희 (울산대학교 공과대학 생명화학공학부) ;
  • 이정훈 (울산대학교 공과대학 생명화학공학부) ;
  • 심재진 (영남대학교 공과대학 응용화학공학부) ;
  • 김재성 (울산대학교 공과대학 생명화학공학부) ;
  • 김선욱 (울산대학교 공과대학 생명화학공학부)
  • Received : 2002.08.22
  • Accepted : 2002.10.18
  • Published : 2002.12.01
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Abstract

To investigate the decomposition kinetics of poly(ethylene terephthalate) the high pressure molten-polymer injector has been devised. Using the experimental apparatus equipped with batch reactor and high pressure molten-polymer injector the decomposition of PET has been performed at constant pressure of 250 bar and 300, 320, $340^{\circ}C$, respectively. At each temperature conditions the conversions after initial 1 minute have shown very high values such as 76-90%. As the temperature increases the conversion reaches more than 98% at 10 minutes. Based on the second order reaction model the reaction rate constants have been obtained. We can calculate the conversions within 2% errors utilizing optimized rate constants. The activation energy for the decomposition of PET at subcritical conditions has shown to be 54.4 kJ/mol.

본 연구의 실험조건에서 poly(ethylene terephthalate)(PET)의 분해반응 속도 연구를 하기 위해서 고압 용융고분자 주입장치를 고안하였다. 회분식 반응기와 고압 용융고분자 주입장치가 결합된 실험 장치를 이용하여 일정압력 250 bar에서 온도를 300, 320, $340^{\circ}C$로 각각 변화시키면서 PET의 분해반응 실험을 수행하였다. 각 온도에서 초기 1분내의 전환율이 76-90%가 될 정도로 매우 높았으며 온도가 증가함에 따라 전환율도 증가하여 반응시간 10분에는 전환율이 98%이상의 높은 값을 보임을 알 수 있었다. 2차 반응에 기초하여 반응속도 상수를 구했으며 이를 이용하여 전환율을 계산하였는데 평균 2%정도의 오차범위로 실험치와 좋은 일치를 보였다. 본 연구에서 얻은 반응속도상수를 이용하여 아임계수 내에서 PET 분해반응의 활성화 에너지를 구하였는데 그 값은 54.4 kJ/mol 이었다.

Keywords

Acknowledgement

Supported by : 한국과학재단

References

  1. Water Sci. Technol v.23 Shanableh, A;Gloyna, E. F
  2. AIChE Journal v.39 no.1 Li, R;Savage, P. E;Szumukler, D https://doi.org/10.1002/aic.690390102
  3. AIChE Journal v.41 no.3 Glucose hydrolysis and oxidation in supercritical water Holgate, H. R;Meyer, J. C;Tester, J. W https://doi.org/10.1002/aic.690410320
  4. Ind. Eng. Chem. Fundam v.24 Lawson, J. R;Klein, M. T
  5. Proceeding of 4th ISSF Watanabe, M;Hirakoso, H;Sawamoto, S;Adschiri, T;Arai, K
  6. Proceeding of 4th ISSF Klein, M. T;Izzo, B;Harrell, C. L;Adschiri, T
  7. Proceeding of 4th ISSF Sasaki, M;Kabyemela, B. M;Adschiri,T;Malaluan, R;Hirose, S;Takeda, N;Arai, K
  8. Proceeding of 4th ISSF Kabyemala, B. B;Takigawa, M;Adschiri, T;Malaluan, R. M;Arai, K
  9. Industrial & Engineering Chemistry Research v.36 no.6 Degradation Kinetics of Dihydroxyacetone and Glyceraldehyde in Subcritical and Supercritical Water Kabyemala, B. M;Takigawa, M;Adschiri, T;Malaluan, R. M;Arai, K https://doi.org/10.1021/ie960747r
  10. Industrial & Engineering Chemistry Research v.36 no.5 Kinetics of Glucose Epimerization and Decomposition in Subcritical and Supercritical Water Kabyemala, B. M;Takigawa, M;Adschiri, T;Malaluan, R. M;Arai, K https://doi.org/10.1021/ie960250h
  11. Kagakuikougaku v.23 Adschiri, T;Sato, O;Machida, K;Saito, N;Arai, K
  12. J. Appl. Polym. Sci v.81 Kim. B. K;Hwang, G. C;Bae, S. Y;Yi, S. C;Kumazawa, H
  13. Journal of Applied Polymer Science v.48 no.3 Kinetic study of the hydrolytic degradation of polyethylene terephthalate at high temperatures Campanelli, J. R;Kamal, M. R;Cooper, D. G https://doi.org/10.1002/app.1993.070480309
  14. Industrial & Engineering Chemistry Research v.37 no.4 Kinetics of Hydrolytic Depolymerization of Melt Poly(ethylene terephthalate) Kao, C. Y;Wan, B. Z;Cheng, W. H https://doi.org/10.1021/ie970543q
  15. Industrial & Engineering Chemistry Research v.37 no.2 Kinetics of Hydrolysis of PET Powder in Nitric Acid by a Modified Shrinking-Core Model Yoshioka, T;Okayama, N;Okuwaki, A https://doi.org/10.1021/ie970459a