Kinetics of hydrolysis of poly(ethylene terephthalate) powder in sulfuric acid by a modified shrinking-core model

被引：192

作者：

Yoshioka, T ^{[1
]}

Motoki, T ^{[1
]}

Okuwaki, A ^{[1
]}

机构：

[1] Tohoku Univ, Dept Appl Chem, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2001年 / 40卷 / 01期

关键词：

D O I：

10.1021/ie000592u

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Poly(ethylene terephthalate) (PET) powder from waste bottles was degradated at atmospheric pressure in 3-9 M sulfuric acid below 150-190 degreesC for 12 h to clarify the mechanism for a feedstock recycle process. Terephthalic acid (TPA) and ethylene glycol (EG) were produced by the acid-catalyzed heterogeneous hydrolysis of PET in sulfuric acid. The TPA yield agreed with the degree of hydrolysis of PET, but the EG yield decreased with increasing sulfuric acid concentration because of carbonization of EG. The kinetics of hydrolysis of PET in sulfuric acid could be explained by a modified shrinking-core model for the chemical reaction control, in which the effective surface area is proportional to the degree of hydrolyzed PET, x, affected by formation and growth of pore and crack on PET powder. The apparent rate constant was proportional to the reciprocal of the particle size and the activity of sulfuric acid, and the activation energy was 88.7 kJ/mol.

引用

页码：75 / 79

页数：5

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