废弃线路板的热解特性及其有价液体产物的分布规律
Pyrolysis characteristics of waste printed circuit boards and distribution pattern of their valuable liquid products
许佳琦 1刘维 1焦芬 1韩俊伟 1覃文庆 1蔡灿1
作者信息
- 1. School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China
- 折叠
摘要
热解技术遵循减量化、无害化和资源化三大固体废弃物处理原则,是一种有前景的大批量废弃线路板处置方法.本论文针对废弃线路板热解产物成分复杂及利用价值低的问题,进行了废弃线路板热解特性、产物组成及其有价液体产物分布规律的研究,为后续工业应用提供理论支撑.结果表明,废弃线路板的热解温区为157～664℃,表观活化能为80.70～279.46 kJ/mol.废弃线路板在热解过程中转化为三种产物,其中固体和气体产物可应用于材料和能源领域.废弃线路板的液体产物组成复杂,并且对热解温度较为敏感.在600℃时热解液体产物中有价组分比例最高(82.94%),其中单环酚类化合物占52.87%,多环酚类化合物占4.39%,溴酚类化合物占3.07%,烃类化合物占22.61%.废弃线路板在热解过程中的有价液体产物可替代酚醛树脂和石化产品中的部分原料.
Abstract
Pyrolysis is a promising technology to treat waste printed circuit boards(WPCBs)with significant advantages of full source utilization,high separation efficiency and scarce pollutant emissions.In this work,TG and DTG analyses were performed to determine pyrolysis characteristics.The kinetic analysis adopting the Starink Kissinger-Akahira-Sunose(SKAS)model was conducted to confirm the apparent activation energy(Eα).Pyrolysis products were collected using a lab-scale pyrolyzer.GC-MS analysis coupled with MS-DIAL data processing was applied to clarify the distribution pattern of valuable liquid products.The results indicated that the main thermal decomposition of WPCBs occurred within the temperature range of 157-664℃,with Eα ranging from 80.70 to 279.46 kJ/mol.During pyrolysis,the WPCBs were converted into three kinds of products,in which solid and gas products could be applied in the field of materials and energy.The composition of WPCBs oil products was complicated and sensitive to the pyrolysis temperature.The largest proportion of valuable liquid products(82.94%)was obtained at 600℃,containing 52.87%monocyclic aromatic phenols,4.39%polycyclic aromatic phenols,3.07%brominated phenols,and 22.61%hydrocarbons,respectively.These valuable liquid products would be an attractive alternative as raw materials for the synthesis of phenolic resins and the production of petrochemicals.
关键词
废弃线路板/热解特性/动力学分析/有价液体产物Key words
waste printed circuit boards/pyrolysis characteristics/kinetic analysis/valuable liquid products引用本文复制引用
基金项目
National Key R&D Program of China(2018YFC1902505)
出版年
2023
NETL
NSTL
维普
万方数据