Pyrolysis characteristics and pyrolysis products separation for recycling organic materials from waste liquid crystal display panels
Pyrolysis characteristics and pyrolysis products separation for recycling organic materials from waste liquid crystal display panels
复制标题
废旧液晶显示面板有机物回收的热解特性及热解产物分离
DOI：
10.1016/j.jhazmat.2015.09.038
复制
发表时间：
2016
影响因子：
13.6
通讯作者：
Xu Zhenming
中科院分区：
文献类型：
--
作者：
Wang Ruixue;Xu Zhenming
废液晶显示器（LCD）面板主要含有无机材料（具有铟锡氧化物膜的玻璃基板）和有机材料（偏光膜和液晶）。由于有机物会阻碍铟的回收过程，因此应事先去除有机物。本研究采用热裂解法从废弃液晶面板中去除有机物，并以环境友好的方式回收乙酸和磷酸三苯酯（TPP）。本文的主要研究内容如下：（1）对煤的热解特性和热解动力学进行了研究，这对深入了解煤的热解过程具有重要意义。(ii)应用响应面法下的Box-Behnken设计（BBD）进行了工程应用优化设计，对进一步工业化回收具有指导意义。当热解温度为570 °C、氮气流量为6 L min-1、颗粒尺寸为0.5 mm时，油收率可达70.53 wt%，残渣率可达14.05 wt%。(iii)此外，乙酸和TPP被回收，然后通过旋转蒸发分离，这可以减少用于生产乙酸的化石能源的消耗，并在电子制造业中重复使用。
Waste liquid crystal display (LCD) panels mainly contain inorganic materials (glass substrate with indium-tin oxide film), and organic materials (polarizing film and liquid crystal). The organic materials should be removed beforehand since the organic matters would hinder the indium recycling process. In the present study, pyrolysis process is used to remove the organic materials and recycle acetic as well as and triphenyl phosphate (TPP) from waste LCD panels in an environmental friendly way. Several highlights of this study are summarized as follows: (i) Pyrolysis characteristics and pyrolysis kinetics analysis are conducted which is significant to get a better understanding of the pyrolysis process. (ii) Optimum design is developed by applying Box–Behnken Design (BBD) under response surface methodology (RSM) for engineering application which is significant to guide the further industrial recycling process. The oil yield could reach 70.53 wt% and the residue rate could reach 14.05 wt% when the pyrolysis temperature is 570 °C, nitrogen flow rate is 6 L min−1and the particle size is 0.5 mm. (iii) Furthermore, acetic acid and TPP are recycled, and then separated by rotary evaporation, which could reduce the consumption of fossil energy for producing acetic acid, and be reused in electronics manufacturing industry.