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首页> 外文期刊>Journal of Hazardous Materials >Decomposition behavior and mechanism of epoxy resin from waste integrated circuits under supercritical water condition
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Decomposition behavior and mechanism of epoxy resin from waste integrated circuits under supercritical water condition

机译：超临界水条件下废集成电路中环氧树脂的分解行为及机理

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摘要

Integrated circuits (IC), a kind of widely used electronic component, is paid great attention to recover valuable materials and remove hazardous materials after being discarded. However, refractory epoxy resin as packaging material is tightly covered on waste IC. It is difficult to remove epoxy resin and recover metals environmentally friendly by traditional methods. In this study, decomposition of epoxy resin from waste IC in supercritical water (SCW) was investigated. The epoxy resin could be efficiently decomposed under SCW condition. High temperature and long operation time of SCW treatment was positive for decomposition efficiency. The main decomposition intermediates and products were phenol and its derivatives. The decomposition mechanism of epoxy resin in supercritical water belongs to complex free radical reaction. Seven proposed pathways for the formation of key intermediates were investigated, with the kinetic and thermodynamic parameters obtained by density functional theory calculations. The analyzation provided assistance in the optimization of SCW treatment. Epoxy resin conversion rate could reach 95.51% under the condition of 500 degrees C, 23 MPa and 90 min, then metals could be easily separated and recovered from solid residue. Thus, SCW treatment presents an efficient and green process for the recycle of waste IC.
机译：集成电路（IC）是一种广泛使用的电子组件，在废弃后，非常重视回收有价值的材料并清除有害材料。然而，作为包装材料的耐火环氧树脂被紧紧地覆盖在废IC上。用传统方法很难去除环氧树脂和回收环境友好的金属。在这项研究中，研究了废IC中超临界水（SCW）中环氧树脂的分解。在SCW条件下，环氧树脂可以被有效地分解。 SCW处理的高温和长时间操作对于分解效率是有利的。主要的分解中间体和产物是苯酚及其衍生物。环氧树脂在超临界水中的分解机理属于复杂的自由基反应。研究了七个提出的关键中间体形成途径，并通过密度泛函理论计算获得了动力学和热力学参数。分析为优化SCW处理提供了帮助。在500℃，23 MPa和90 min的条件下，环氧树脂的转化率可达到95.51％，金属易于分离并从固体残渣中回收。因此，SCW处理为废物IC的回收提供了一种高效且绿色的过程。

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  • 来源
    《Journal of Hazardous Materials》 |2019年第15期|356-364|共9页
  • 作者

    Li Kuo; Zhang Lingen; Xu Zhenming;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    e-waste treatment; Supercritical water technology; Epoxy resin decomposition; Mechanism analysis;

    机译：电子废物处理;超临界水技术;环氧树脂分解;机理分析;

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