生物油蒸馏残渣与废弃塑料催化共热解协同作用的研究

Synergistic effect during catalytic co-pyrolysis of bio-oil distillation residue and waste plastic

利用热重分析仪和两段式固定床研究了生物油蒸馏残渣(DR)与废弃塑料(MS)的共热解特性,探索了DR与MS混合比、无催化、原位催化及异位催化对产物分布及液相产物化学组分的影响,以及共热解产物的相对选择性与协同作用。结果表明:随着混合比的增加,液相产率呈现增长趋势;相比于无催化,原位催化、异位催化下液相产物中芳烃相对含量增高、含氧化合物相对含量降低。在原位催化下,DR与MS在脂肪族化合物与含氧化合物上表现出的协同作用与异位催化、无催化相反。对于单环芳烃,DR与MS的协同作用参数值大小关系为:无催化>异位催化>原位催化;对于脂肪烃,在DR∶MS=1∶1时,无催化、原位与异位催化下的协同作用参数最大,分别为-20.7%、25.2%、-41.2%;对于脂环烃,在DR∶MS=2∶1时,无催化、原位与异位催化下的协同作用参数最大,分别为184.2%、132.5%、50.0%;对于多环芳烃,DR与MS在不同催化方式下均表现为负协同作用。

The work aims to explore co-pyrolysis characteristics of bio-oil distillation residue(DR)and waste medical syringe(MS)by thermogravimetric analyzer and the two-stage fix-bed reactor.The effects of mixing ratio of DR and MS,non-catalytic,in-situ catalytic and ex-situ catalytic co-pyrolysis on product distribution and chemical components of liquid products were investigated.Based on chemical components of liquid products,the relative selectivity and synergistic effect of co-pyrolysis products of DR and MS were studied.The results showed that the liquid yield had an increasing trend with the increasing of mixing ratio,and in-situ catalytic and ex-situ catalytic co-pyrolysis had a higher relative content of aromatic hydrocarbons compared to non-catalytic co-pyrolysis,while the relative content of oxygenates was lower.For synergistic effect of DR and MS on aliphatic compounds and oxygenates,in-situ catalytic co-pyrolysis was contrary to ex-situ catalytic and non-catalytic co-pyrolysis.For monocyclic aromatic hydrocarbons,the synergistic parameters of DR and MS using different catalytic modes are as follows:non-catalytic>ex-situ catalytic>in-situ catalytic.For aliphatic hydrocarbons,when DR∶MS=1∶1,the synergistic parameter values of non-catalytic,in-situ catalytic and ex-situ catalytic co-pyrolysis are the largest,which are-20.7%,25.2%and-41.2%,respectively.For alicyclic hydrocarbons,when DR∶MS=2∶1,the synergistic parameters values of non-catalytic,in-situ catalytic and ex-situ catalytic co-pyrolysis reach the maximum values,which are 184.2%,132.5%and 50.0%,respectively.For PAHs,DR and MS showed negative synergy under different catalytic modes.