Abstract
Abstract Discarded polyethylene terephthalate (PET), polylactic acid (PLA), and rice straw are major waste materials requiring appropriate management. However, no systematic approach is in effect in Taiwan for processing these materials. This study investigates the kinetic changes of copyrolyzing mixtures of PET, PLA, and rice straw. Physical and chemical properties of individual and the mixtures were analyzed and pyrolysis kinetics were studied using both Friedman and Coats–Redfern integral methods. Specifically, the Friedman method was adopted to estimate kinetic parameters in the overall pyrolysis reactions, whereas the integral method was applied to estimate the kinetic parameters under distinct extent of conversion at various phases. When PET and PLA were copyrolyzed with rice straw, the activation energies estimated decreased significantly probably due to the high level of potassium in rice straw catalyzing the pyrolysis reaction. Therefore, copyrolysis is a potential technology worthy of further ex...
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