废轮胎和天然橡胶在超临界甲苯中的解聚研究

The depolymerization of scrap tire or nature rubber in supercritical toluene was studied. Experiments were carried out under the conditions of 300℃~360℃, 3.7MPa~7.0MPa, 20min~90min, toluene/sample weight ratio 5.0~10.0, respectively. The study was focused on the relationship between depolymerization and the reaction conditions and the depolymerization products distribution. Liquid products were analyzed by a gas chromatography coupled with a mass spectrometer. The results show that most of liquid products are similar in different experiment samples containing alkyl aromatic species and alkene. Their molecular weights are below 300. Supercritical toluene plays an important role, which is not only to swell and dissolve experiment samples, but also to participate in the depolymerization. The results obtained may enforce the basic knowledge on selecting depolymerization fluids and operating parameters correctly.