Decomposition of PET in High Pressure Subcritical Water
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(4) (2002 8 22 , 2002 10 18 ) *. Decomposition of PET in High Pressure Subcritical Water Seung-Hee Chung, Jung-Hoon Lee, Jae-Jin Shim*, Jae-Seong Kim and Sunwook Kim† School of Chemical Engineering and Bio Engineering, University of Ulsan, Ulsan 680-749, Korea *School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan 712-749, Korea (Received 22 Augsut 2002; accepted 18 October 2002). poly(ethylene terephthalate)(PET)
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(8) ^_1 `a IV b LK 54.4 kJ/mol (Q . o. Abstracts − 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 oC, 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. Key words: PET, Decomposition, Subcritical Water, Rate Constant. 1.. . r , ^_s ( ab ?t u v L8S wxy# z {"12. W> n | 8. ab G (ab }~K NI P 1w , i }~ Tohoku MK BC M ()ab(NIMCR) > U WHI V
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(177) # W8 1> ð8( 250 bar. o. o. o. o. o. o. 40 6 2002 12. CCOOH CEL CELi CH2O CH2Oi COH. : concentration of carboxylic acid [mmol/gPET] : concentration of ester linkage [mmol/gPET] : initial concentration of ester linkage [mmol/gPET] : concentration of water [mmol/gPET] : initial concentration of water [mmol/gPET] : concentration of ethylene glycol [mmol/gPET]. k k' r t. : forward reaction rate constant [g PET/mol/min] : backward reaction rate constant [g PET/mol/min] : ratio of initial concentrations of water and ester linkage : time [min].
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