Recycling acetic acid from polarizing film of waste liquid crystal display panels by sub/supercritical water treatments.
Recycling acetic acid from polarizing film of waste liquid crystal display panels by sub/supercritical water treatments.
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DOI：
10.1021/acs.est.5b00104
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发表时间：
2015-05
影响因子：
11.4
通讯作者：
Ruixue Wang;Ya Chen;Zhenming Xu
中科院分区：
文献类型：
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作者：
Ruixue Wang;Ya Chen;Zhenming Xu
废液晶显示器（LCD）面板主要含有无机材料（玻璃基板）和有机材料（偏光膜和液晶）。由于含有偏振膜和液晶的有机材料对铟回收过程不利，因此应首先去除有机材料。在本研究中，研究了通过亚/超临界水处理从废弃LCD面板中获得乙酸的高效且环保的工艺。此外，提出了一个有根据的反应机理。本研究的几个亮点概括如下：（1）有机物去除率达99.77%，表明本技术是一种非常有效的有机物回收利用技术：（2）获得了78.23%的乙酸，这是一种非常重要的化石能源化工产品，可以减少生产乙酸的化石能源消耗;（iii）超临界水作为理想的溶剂、必需的反应物以及有效的酸碱催化剂，这根据“绿色化学原理”是非常重要的。总之，废弃液晶面板的有机物被回收利用，没有环境污染。同时，这项研究为化石基化学产品的可持续发展提供了新的机会，将“废物”转化为“化石基化学品”。
Waste liquid crystal display (LCD) panels mainly contain inorganic materials (glass substrate) and organic materials (polarizing film and liquid crystal). The organic materials should be removed first since containing polarizing film and liquid crystal is to the disadvantage of the indium recycling process. In the present study, an efficient and environmentally friendly process to obtain acetic acid from waste LCD panels by sub/supercritical water treatments is investigated. Furthermore, a well-founded reaction mechanism is proposed. Several highlights of this study are summarized as follows: (i) 99.77% of organic matters are removed, which means the present technology is quite efficient to recycle the organic matters; (ii) a yield of 78.23% acetic acid, a quite important fossil energy based chemical product is obtained, which can reduce the consumption of fossil energy for producing acetic acid; (iii) supercritical water acts as an ideal solvent, a requisite reactant as well as an efficient acid-base catalyst, and this is quite significant in accordance with the "Principles of Green Chemistry". In a word, the organic matters of waste LCD panels are recycled without environmental pollution. Meanwhile, this study provides new opportunities for alternating fossil-based chemical products for sustainable development, converting "waste" into "fossil-based chemicals".