关键词: 生物油蒸馏残渣, 废弃塑料, 固定床, 共热解, 催化, 协同作用

Abstract:

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.

Key words: bio-oil distillation residue, waste plastic, fixed bed, co-pyrolysis, catalysis, synergistic effect