聚乙烯塑料在连续超临界水反应器中的油化研究

在连续超临界水（SCW）反应器中考察了反应温度、停留时间和反应压力对聚乙烯（PE）降解油化的影响。实验结果表明，在120s、25MPa下，从500℃提高到550℃，液体收率呈现先升后降的趋势，在530℃达到最大值（79%）；在520℃、25MPa下，随停留时间的延长，PE裂解程度加深，产物轻质化程度提高，导致液体收率降低，停留240s时，气体收率达到43%；反应压力对产物收率的影响较小，气、液产物中烯/烷比随反应压力的增加而增大。

Investigation on degradation of polyethylene to oil in a continuous supercritical water reactor

The effects of temperature, residence time, and pressure on the degradation of polyethylene (PE) to oil were investigated in supercritical water (SCW) using a 180mL continuous reactor. The yield of oil product increases with the increase of temperature, reaching 79% at 530℃, and then decreases as the temperature further increases. The yield of gas product increases from 3% to 22% as the temperature increases from 500℃to 550℃. The product distribution shifts toward shorter chain hydrocarbons with the prolongation of reaction time. Furthermore, the ratio of alkenes to alkanes of products increases with the increase of temperature and pressure, and decreases with the increase of reaction time. The effect of pressure on both products' yield and composition is less significant.