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热解及超临界水处理废弃液晶面板偏光片的反应机理

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王瑞雪, 王燕萍, 马恩, 张承龙. 热解及超临界水处理废弃液晶面板偏光片的反应机理[J]. 环境化学, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
引用本文: 王瑞雪, 王燕萍, 马恩, 张承龙. 热解及超临界水处理废弃液晶面板偏光片的反应机理[J]. 环境化学, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
shu
WANG Ruixue, WANG Yanping, MA En, ZHANG Chenglong. Reaction mechanism of waste liquid crystal display panels under pyrolysis and supercritical water treatment conditions[J]. Environmental Chemistry, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
Citation: WANG Ruixue, WANG Yanping, MA En, ZHANG Chenglong. Reaction mechanism of waste liquid crystal display panels under pyrolysis and supercritical water treatment conditions[J]. Environmental Chemistry, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
shu

热解及超临界水处理废弃液晶面板偏光片的反应机理

  • 上海第二工业大学资源循环科学与工程中心/电子废弃物研究中心/上海电子废弃物资源化协同创新中心, 上海, 201209

    • 通讯作者: 王瑞雪, E-mail: rxwang@sspu.edu.cn ; 
  • 基金项目:

    国家自然科学基金（21806102），上海市青年科技英才扬帆计划（18YF1408800）和上海第二工业大学重点学科（XXKZD1602）资助.

Reaction mechanism of waste liquid crystal display panels under pyrolysis and supercritical water treatment conditions

  • Research Center of Resource Recycling Science and Engineering/WEEE Research Centre/Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai Polytechnic University, Shanghai, 201209, China

    • Corresponding author: WANG Ruixue, rxwang@sspu.edu.cn ; 
  • Fund Project: Supported by the National Natural Science Foundation of China (21806102), Shanghai Sailing Program (18YF1408800) and Key Discipline of Shanghai Polytechnic University (XXKZD1602).

  • 摘要: 作为废弃液晶面板（LCD）的主要有机组分，偏光片的处置不仅可消除有机污染物对环境的危害，同时也是铟资源回收的必要前处理步骤.本文研究了不同处理条件（热解和超临界水）下偏光片的反应机制，分析并比较了两种反应条件下主要产物的生成机理.在热解条件下，偏光片主要组分三醋酸纤维素（TAC）中三醋酸葡萄糖单体上的酯羰基发生顺式消除反应生成主产物乙酸.在超临界水反应条件下，磷酸三苯酯（TPP）可发生水解反应生成磷酸和苯酚，使体系中氢离子浓度增加，可作为TAC水解的催化剂，TAC则经历四面体过渡态水解生成主产物乙酸.同时，本文对两种处理技术进行了分析和比较，结果表明热解处理具有设备简单、反应条件较温和、反应产物附加值高、易于分离等优点，应作为废弃偏光片的首选处理方法.本文为绿色、高效的回收废弃LCD提供理论基础和实践经验.
    Abstract: As the main organic component of waste liquid crystal display (LCD) panel, treatment of the polarizing film not only can eliminate the organic pollutant, but also is a necessary step in the indium recycling process. In this study, the reaction mechanisms of the polarizing film under the condition of pyrolysis and supercritical water were studied. In the pyrolysis process, the carbonyl group of glucose triacetate, monomer of cellulose triacetate, would generate acetic acid through syn-elimination. In the supercritical water treatment process, triphenyl phosphate (TPP) produced phosphoric acid and phenol by hydrolysis, and hydrogen ion was used as the catalyst of TAC hydrolysis. TAC generated acetic acid through a tetrahedral transition state. Meanwhile, pyrolysis and supercritical were compared, and the results show that pyrolysis would be the preferred method since pyrolysis has the advantages of simple equipment, mild reaction conditions, high value-added products and easy separation of the products. This study can provide fundamental basis as well as practical experience for recycling waste LCD environmentally and efficiently.
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  • 收稿日期:  2019-04-09
王瑞雪, 王燕萍, 马恩, 张承龙. 热解及超临界水处理废弃液晶面板偏光片的反应机理[J]. 环境化学, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
引用本文: 王瑞雪, 王燕萍, 马恩, 张承龙. 热解及超临界水处理废弃液晶面板偏光片的反应机理[J]. 环境化学, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
shu
WANG Ruixue, WANG Yanping, MA En, ZHANG Chenglong. Reaction mechanism of waste liquid crystal display panels under pyrolysis and supercritical water treatment conditions[J]. Environmental Chemistry, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
Citation: WANG Ruixue, WANG Yanping, MA En, ZHANG Chenglong. Reaction mechanism of waste liquid crystal display panels under pyrolysis and supercritical water treatment conditions[J]. Environmental Chemistry, 2020, (6): 1642-1649. doi: 10.7524/j.issn.0254-6108.2019040905
shu

热解及超临界水处理废弃液晶面板偏光片的反应机理

    通讯作者: 王瑞雪, E-mail: rxwang@sspu.edu.cn ; 
  • 上海第二工业大学资源循环科学与工程中心/电子废弃物研究中心/上海电子废弃物资源化协同创新中心, 上海, 201209
  • 收稿日期:  2019-04-09
基金项目:

国家自然科学基金（21806102），上海市青年科技英才扬帆计划（18YF1408800）和上海第二工业大学重点学科（XXKZD1602）资助.

摘要: 作为废弃液晶面板（LCD）的主要有机组分，偏光片的处置不仅可消除有机污染物对环境的危害，同时也是铟资源回收的必要前处理步骤.本文研究了不同处理条件（热解和超临界水）下偏光片的反应机制，分析并比较了两种反应条件下主要产物的生成机理.在热解条件下，偏光片主要组分三醋酸纤维素（TAC）中三醋酸葡萄糖单体上的酯羰基发生顺式消除反应生成主产物乙酸.在超临界水反应条件下，磷酸三苯酯（TPP）可发生水解反应生成磷酸和苯酚，使体系中氢离子浓度增加，可作为TAC水解的催化剂，TAC则经历四面体过渡态水解生成主产物乙酸.同时，本文对两种处理技术进行了分析和比较，结果表明热解处理具有设备简单、反应条件较温和、反应产物附加值高、易于分离等优点，应作为废弃偏光片的首选处理方法.本文为绿色、高效的回收废弃LCD提供理论基础和实践经验.

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