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›› 2001, Vol. 1 ›› Issue (1): 0-0.

• 1 •    

Methanolsis of Poly(ethylene terephthalate) in Supercritical Phase

Yang Yong, Xiang Hong-wei, et al.   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry,Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
  • 出版日期:2001-02-20 发布日期:2001-02-20

Kinetics of Epoxidation of Propylene with H2O2 in Isopropanol

CHEN Xiao-hui, TAN Wei, MI Zhen-tao, WANG Chun-yan, XU Xi-en   

  1. Chemical Engineering School, Tianjin University, Tianjin 300072, China
  • Online:2001-02-20 Published:2001-02-20

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摘要： The depolymerization of poly(ethylene terephthalate, PET) in supercritical methanol is studied using a stainless stirred autoclave at temperature of 255~260℃, pressure of 8.5~14.0 MPa, and methanol/PET weight ratio of 3~8. Under the optimal conditions, the PET is depolymerized completely to its monomers in 60 min. The main products of the reaction are dimethyl terephthalate and ethylene glycol. There are still some small amounts of byproducts, such as methyl–(2-hydroxyethyl) terephthalate, bis(hydroxyethyl) terephthalate, dimers and oligomers. Reversed-phase high performance liquid chrom- atography and gas chromatography are used to analyze solid products and liquid products respectively. The results of depolymerization show that the yield of dimethyl terephthalate and the degree of PET depolymerization are dependent on the reaction temperature, weight ratio of methanol to PET and reaction time. But the reaction pressure has little influence on the depolymerization as long as methanol is in supercritical state.

关键词: polyethylene terephthalate (PET), methanolysis, chemical recycling, supercritical fluid, depolymerization

Abstract: The epoxidation of propylene with H2O2 in isopropanol under mild conditions over TS–1 molecular sieve was studied, the primary and side reaction kinetics was discussed, and the effects of temperature, pressure and other factors on reactions were analyzed. It was found that when pressure of propylene was 0.3 MPa and temperature below 40oC, the yield of propylene oxide was up to 75%, and the integration of propylene epoxidation with manufacture of H2O2 via isopropanol was possible.

Key words: propylene oxide, TS–1, hydrogen peroxide, isopropanol, kinetics

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