废弃香烟过滤嘴辅助增强木质素微波解聚特性

Enhancement of the Microwave-assisted Pyrolysis of Lignin by Adding Used Cigarette Filter

关键词:  木质素  微波解聚  废弃香烟过滤嘴  酚类化合物  协同效应

Key Words:lignin  microwave-assisted pyrolysis  used cigarette filter  phenolic compounds  synergistic effect

摘要:木质素微波解聚存在转化效率偏低、二次反应剧烈等问题。本研究通过在木质素中添加一定比例的废弃香烟过滤嘴（UCF）颗粒来辅助增强木质素的快速解聚和调控产物组分分布。结果表明，随着UCF添加量的增大，生物油产率逐渐增加，生物炭产率呈下降趋势。与理论产率相比，UCF的加入更有利于生物油和生物炭的生成。对生物油化学成分定量分析发现，UCF的加入能够通过脱甲氧基或脱羟基作用来降低愈创木基酚类化合物的产量。当UCF添加量为60%（相对于木质素）时，对羟苯基酚类化合物（127.53 mg/g）和芳香烃类物质（22.28 mg/g）的产量达到最高。对固体产物分析发现，生物炭比表面积随着UCF添加量的增大而逐渐增加，同时UCF加入能够形成炭纤维结构并在木质素炭上附着和生长。本研究发现UCF和木质素在微波解聚过程中发生了显著的协同效应，对于木质素的高效转化和废弃资源高值化利用具有积极意义。

Abstract:Microwave-assisted pyrolysis of lignin exists some problems of low conversion efficiency and severe secondary reaction. In this study， used cigarette filter （UCF） particles were used to assist the fast pyrolysis of lignin and control the distribution of pyrolysis products. Results showed that with the increase of UCF adding proportion in lignin， the yield of bio oil increased gradually， and the yield of biochar decreased. Compared with the theoretical yield， the addition of UCF was conducive to the generation of bio oil and biochar. The adding of UCF reduced the yield of guaiacols from lignin pyrolysis by demethylation or dehydroxylation reaction. The highest yields of P-hydroxyphenols （127.53 mg/g） and aromatic hydrocarbon （22.28 mg/g） were obtained with 60% mass ratio of UCF to lignin. The analysis of solid products showed that the specific surface area of biochar increased gradually with the increasing of the proportion of UCF in lignin. UCF could form the structure of carbon fiber and attached and grew on the surface of lignin carbon. In this study， the remarkable synergistic effect between UCF and lignin was observed in the process of microwave-assisted pyrolysis which had great significance for the conversion efficiency of lignin and the high-value utilization of waste resources.