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고압 아임계수 내에서 PET의 분해

Decomposition of PET in High Pressure Subcritical Water

정승희 이정훈 심재진¹ 김재성 김선욱^†

Seung-Hee Chung Jung-Hoon Lee Jae-Jin Shim¹ Jae-Seong Kim Sunwook Kim^†

울산대학교 공과대학 생명화학공학부, 울산 680-749 ¹영남대학교 공과대학 응용화학공학부, 경산 712-749

School of Chemical Engineering and Bio Engineering, University of Ulsan, Ulsan 680-749, Korea ¹School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan 712-749, Korea

swkim@uou.ulsan.ac.kr

HWAHAK KONGHAK, December 2002, 40(6), 709-714(6), NONE

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Abstract

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 ℃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 활성화에너지를 구하였는데 그 값은 54.4 kJ/mol 이었다.

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 ℃, 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.

Keywords

PET Decomposition Subcritical Water Rate Constant

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