Chemical Recycling, Kinetics, and Thermodynamics of Hydrolysis of Poly(ethylene terephthalate) Waste with Nonaqueous Potassium Hydroxide Solution

2004 ◽  
Vol 43 (2) ◽  
pp. 369-388 ◽  
Author(s):  
A. S. Goje ◽  
S. A. Thakur ◽  
V. R. Diware ◽  
Y. P. Chauhan ◽  
S. Mishra
Keyword(s):  
Potassium Hydroxide ◽  
Ethylene Terephthalate ◽  
Potassium Hydroxide Solution ◽  
Chemical Recycling ◽  
Kinetics And Thermodynamics ◽  
Hydroxide Solution ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Hydrolysis Of

Synthesis and sizing performances of water-soluble polyester based on bis(2-hydroxyethyl) terephthalate derived from depolymerized waste poly(ethylene terephthalate) fabrics

2018 ◽  
Vol 89 (4) ◽  
pp. 572-579 ◽  
Author(s):  
Jing Lu ◽  
Mengjuan Li ◽  
Yanyan Li ◽  
Xiaoqiang Li ◽  
Qiang Gao ◽  
...  
Keyword(s):  
Surface Tension ◽  
Fourier Transform ◽  
Ethylene Terephthalate ◽  
Water Soluble ◽  
Chemical Recycling ◽  
Step Method ◽  
Pet Fabric ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Viscosity Stability

This work aimed at effective chemical recycling of waste poly(ethylene terephthalate) (PET) fabrics into water-soluble polyester (WSP). For this, PET fabric waste was depolymerized using excess ethylene glycol (EG) in the presence of zinc acetate as catalyst. The glycolysis product of PET, bis(2-hydroxyethyl) terephthalate (BHET) was then used to synthesize WSP by a three-step method, that is, transesterification, esterification and polycondensation. The structures of BHET and WSP were identified by Fourier transform infrared spectra. Sizing performances of WSP were studied, and it was found that the surface tension of WSP size (57 mN/m, 22℃, 0.5% of weight) was lower than common sizes, the viscosity of WSP size was 1–2 mPa·S (95℃, 6% of weight) and the viscosity stability was larger than 90% at this temperature. The mixture of WSP and starch showed stronger adhesion to polyester–cotton roving and polyester roving than onefold starch. K/ S values of fibers before sizing and after desizing showed a slightly difference, which indicated that WSP would not influence the color of yarns when used as the sizing agent.

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