关键词:

亚临界乙醇, 聚碳酸酯, 氢氧化钠, 催化解聚, 动力学

Abstract:

Catalytic depolymerization of polycarbonate (PC) in sub-critical ethanol was performed in a batch reactor under pressures 1.1 MPa to 5.9 MPa and at temperatures 140℃ to 220℃ for 15 min to 60 min.FT-IR, GC-MS and GC were used to analyze the products, and the depolymerization ratio of PC and the yield of bisphenol A (BPA) were estimated.The results showed that the depolymerization ratio of PC increased with the increase of temperature and reaction time, while the yield of BPA decreased because of its decomposition at elevated temperatures and long reaction time.The optimal condition for the yield of BPA was 170℃ and 1.7 MPa, in which the depolymerization ratio of PC reached 84.2% in 15 min and the yield of BPA was 95.7% of the expected value.Kinetic analysis showed the catalytic depolymerization reaction in sub-critical ethanol was a first-order reaction and its activation energy was 40.15 kJ·mol^-1.

Key words:

亚临界乙醇, 聚碳酸酯, 氢氧化钠, 催化解聚, 动力学