松木屑/低密度聚乙烯微波辅助共热解行为研究(英文)

Microwave-assisted Co-pyrolytic Behaviors of Pine Sawdust Combinated with Low-density Polyethylene

通过TG和DSC对松木屑/低密度聚乙烯(LDPE)混合物的热解行为进行了研究,并利用微波辅助加热方式对不同质量比松木屑/LDPE混合物的热解产物进行了分析。实验表明,松木屑和LDPE可在270～480℃温度区间共热解,且共热解行为以375℃为界可分为两个阶段;松木屑/LDPE质量比在10∶2以下时具有较明显的共热解行为。气-质联用(GC-MS)分析表明,提高微波功率或增加LDPE加入量均会降低共热解液相产物的产率,其产物中愈创木酚类产物的产率降幅明显;生成大量的1-羟基-2-丙酮和乙酸,约占液相产物分率50%以上。大功率微波辅助加热会增加不凝气体,且LDPE加入量的增加会促进CO、CO2的产生。

The co-pyrolytic behaviors of pine sawdust and low-density polyethylene （LDPE） were investiga- ted by TG and DSC methods. The yield and composition of the pyrolyitc products from different ratio of the pine sawdust to LDPE mixtures were studied by heating with microwave. The results showed that pine sawdust and LDPE can be co-pyrolyzed in the range of 270 - 480 ~C, which can be divided into two sections before and after 375 ~C. It was observed that the co-pyrolytic effect took place at the weight ratio of co-pyrolytic pine sawdust to LDPE below 10： 2. The gas chromatography-mass spectrometry （ GC- MS） analysis results showed that the yield of co-pyrolytic liquid, especially guaiacols generated from wood, was reduced with the amount of LDPE increasing and microwave power enhancing. However, 1-hydroxy-2-propanone and acetic acid were increased considerably, which exceeded half content of the liquid products. The higher microwave power was used, the more non-condensa- ble gases were generated. It was also found that the increasing amount of LDPE boosted the generation of oxycarbide gases.