Kinetics of Hydrolysis of Poly(ethylene terephthalate) Powder in Sulfuric Acid by a Modified Shrinking-Core Model

2001 ◽  
Vol 40 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Toshiaki Yoshioka ◽  
Tsutomu Motoki ◽  
Akitsugu Okuwaki
Keyword(s):  
Sulfuric Acid ◽  
Ethylene Terephthalate ◽  
Core Model ◽  
Shrinking Core Model ◽  
Kinetics Of Hydrolysis ◽  
Poly Ethylene Terephthalate ◽  
Shrinking Core ◽  
Poly Ethylene ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetics of Glycolysis of Poly (ethylene Terephthalate) by Shrinking-Core Model

2011 ◽  
Vol 233-235 ◽  
pp. 627-631 ◽  
Author(s):  
Fei Fei Chen ◽  
Guang Hui Wang ◽  
Wei Li ◽  
Feng Yang
Keyword(s):  
Ethylene Glycol ◽  
Ethylene Terephthalate ◽  
Weight Ratio ◽  
Core Model ◽  
Shrinking Core Model ◽  
Element Analysis ◽  
Poly Ethylene Terephthalate ◽  
Shrinking Core ◽  
Poly Ethylene ◽  
Kinetics Of

Poly (ethylene terephthalate) (PET) wastes were depolymerised using excess ethylene glycol (EG) in the presence of zinc acetate as transesterificaion catalyst. Influences of particle size, reaction temperature, weight ratio of ethylene glycol (EG) to PET and weight ratio of catalyst to PET on the yield of bis(hydroxyethyl terephthalate)(BHET) were investigated. The kinetics of glycolysis of PET in EG could be interpreted by the shrinking-core model of chemical reaction control, the activation energy of the glycolysis was 133 KJ/mol. The glycolysis product was analyzed and identified by FTIR and Element analysis.

Ethylene Glycol and Glycerin as the Solvent for Alkaline Treatment of Poly(ethylene Terephthalate) Fabrics

1997 ◽  
Vol 67 (10) ◽  
pp. 760-766 ◽  
Author(s):  
M.-C. Yang ◽  
H.-Y. Tsai
Keyword(s):  
Ethylene Glycol ◽  
Degradation Rate ◽  
Ethylene Terephthalate ◽  
Treatment Time ◽  
Alkaline Treatment ◽  
Aqueous System ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Kinetics Of ◽  
Scanning Electron

Poly(ethylene terephthalate) fabrics are treated with sodium hydroxide using ethylene glycol or glycerin as the solvent. Compared with conventional aqueous alkaline hydrolysis, the degradation rate in ethylene glycol increases tenfold. The kinetics of the alkaline-ethylene glycol treatment show that the weight loss is linear with respect to time. The moisture regain rate and tensile properties of the treated fabrics are measured; other tests include scanning electron microscopy and dyeing properties. The results show that the properties of the treated fabrics do not depend significantly on the solvent; therefore, using ethylene glycol can greatly shorten the treatment time to achieve results similar to those with the conventional aqueous system.

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