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Reaction kinetics and mechanism of catalyzed hydrolysis of waste PET using solid acid catalyst in supercritical CO 2
Author(s) -
Li XueKun,
Lu Hui,
Guo WenZe,
Cao GuiPing,
Liu HongLai,
Shi YunHai
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14632
Subject(s) - supercritical fluid , arrhenius equation , catalysis , activation energy , chemistry , hydrolysis , kinetics , titration , chemical kinetics , fourier transform infrared spectroscopy , reaction mechanism , chemical engineering , reaction rate , thermodynamics , organic chemistry , physics , quantum mechanics , engineering
Hydrolysis of waste poly(ethylene terphthalate) (PET) using solid acid catalyst in SCCO 2 is presented in this work for the first time. The mechanism of PET chains scission was proved to be a combination of chain end and random chain scission by Fourier transform ‐ infrared spectroscopy (FT‐IR) and titration analysis. A new reaction kinetics model of PET hydrolysis in SCCO 2 was setup by introducing the Arrhenius equation into an ordinary reaction rate equation, the frequency factor and apparent activation energy were expressed in terms of temperature and CO 2 pressure, respectively. With this reaction kinetics model, the effects of temperature, and pressure were investigated. An interesting mechanism was proposed to describe the reaction process that both water molecules and hydroniums were carried and penetrated into the amorphous regions of the swollen PET by SCCO 2 , subsequently hydrolysis reaction preferentially took place in the amorphous regions of both surface and bulk of PET matrix. © 2014 American Institute of Chemical Engineers AIChE J , 61: 200–214, 2015