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首页> 外文会议>European Meeting on Supercritical Fluids >EXTRACTION OF LIQUID CRYSTALS FROM FLAT PANEL DISPLAY DEVICES USING BOTH LIQUID AND SUPERCRITICAL CARBON DIOXIDE
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EXTRACTION OF LIQUID CRYSTALS FROM FLAT PANEL DISPLAY DEVICES USING BOTH LIQUID AND SUPERCRITICAL CARBON DIOXIDE

机译：使用液体和超临界二氧化碳从平板显示装置提取液晶

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Recent legislation such as the WEEE directive in Europe has meant that devices such as flat panel displays can no longer be disposed of by landfill. Current methods for disposal and/or recycling of these valuable waste resources are at best limited. It is predicted that by 2010 in the UK alone, 33 tonnes of liquid crystal flat panel displays will be discarded daily, equating to 9 tonnes of liquid crystal per year with a potential value of tens of millions of dollars. Herein we demonstrate that both liquid and supercritical carbon dioxide are effective and environmentally benign solvents for extraction of liquid crystals from display devices. Typically the recovery with liquid carbon dioxide was in excess of 96% after 15 minutes. Extractions with carbon dioxide demonstrate numerous advantages over traditional solvents such as dichloromethane; toxicity is reduced, no solvent residues remain after release of pressure and in many cases secondary purification processes are not required. Pilot scale extractions have been undertaken and demonstrated high extraction yields consistent with those achieved on a laboratory scale. Variation of both temperature and pressure (and therefore density) has shown that a degree of fractionation is achievable at the point of extraction and/or collection. The recovered liquid crystal exhibits the nematic phase as evidenced by thermal polarising optical microscopy (Figure 1).
机译：最近的立法，例如欧洲的WEEE指令已经意味着诸如平板显示器等设备不能再被垃圾填埋场处理。这些有价值的废物资源的处理和/或回收的目前的方法均可获得最有限。据预测，到2010年，单独于英国，每天将丢弃33吨液晶平板显示器，每年等于9吨液晶，潜在的数量数百万美元。在此，我们证明液体和超临界二氧化碳两种用于从显示装置提取液晶的有效且环境良性的溶剂。通常，在15分钟后，用液体二氧化碳的回收率超过96％。二氧化碳的提取表现出与传统溶剂等二氯甲烷的众多优点;毒性降低，在释放压力后，没有溶剂残留物保留，并且在许多情况下，不需要进行二次纯化方法。已经开展了试验规模提取，并证明了与实验室规模达到的人一致的高萃取产量。温度和压力（和因此密度）的变化表明，在提取和/或收集点可以实现一定程度的分馏。回收的液晶表现出由热偏振光学显微镜（图1）所证明的向列阶段。

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