Probing the combustion and pyrolysis behaviors of polyurethane foam from waste refrigerators
Probing the combustion and pyrolysis behaviors of polyurethane foam from waste refrigerators
复制标题
探讨废冰箱聚氨酯泡沫的燃烧和热解行为
DOI：
10.1007/s10973-019-09086-8
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发表时间：
2019-12
影响因子：
4.4
通讯作者：
Junhong Tang
中科院分区：
文献类型：
--
作者：
Zhitong Yao;Shaoqi Yu;Weiping Su;Daidai Wu;Jie Liu;Weihong Wu;Junhong Tang
废弃冰箱中的聚氨酯泡沫（PUR）由于体积大、重量轻、含氯氟烃含量高，长期以来一直被认为是一种难以处理的电子垃圾。本文采用热重-傅里叶红外光谱-质谱（TG/FT-IR/MS）技术研究了PUR的燃烧和热解行为。确定了两种热过程的分解机理，并对卤素的去向进行了很好的探讨。热重分析表明，PUR燃烧可分为三个主要阶段，峰值温度分别为328、557和970℃。作为对比，其热解分为两个步骤，峰值温度分别为332℃和970℃。FT-IR结果表明，PUR在400 ~ 600℃时燃烧剧烈，而在200 ~ 400℃热解时分解剧烈。质谱分析表明，PUR分子中的聚氨酯键在200-400℃燃烧时裂解成异氰酸酯和多元醇，在400-650℃进一步分解并与卤素发生反应。然而，在200℃以下的热解过程中，酯键断裂成芳香硝基化合物和醚。在200 ~ 500℃的较高温度范围内，检测到的卤化衍生物较多，但强度较低。除氟氯烃、氯苯、二氯苯、邻氯苯胺、三氟丙酮等卤化产物外，还检测到小分子氰化氢、氨、二氧化碳、一氧化碳等。
Polyurethane foam (PUR) from waste refrigerators has long been recognized as a difficult-to-treat electronic waste, due to its bulkiness, low weight and chlorofluorocarbon content. In this work, the combustion and pyrolysis behaviors of PUR were investigated using a versatile thermogravimetric–Fourier infrared spectrum–mass spectrum (TG/FT-IR/MS) technique. The decomposition mechanisms in both thermal processes were determined, and the fate of halogens was probed well. TG analysis indicated that the PUR combustion could be divided into three main stages with peak temperatures of 328, 557 and 970 °C, respectively. As a comparison, its pyrolysis could be divided into two steps with peak temperatures of 332 and 970 °C. FT-IR results indicated that the PUR combusted vigorously at 400–600 °C, whereas it decomposed drastically at the lower temperature of 200–400 °C in pyrolysis. MS analysis revealed that the urethane bonds in the PUR molecules broke into isocyanates and polyols at 200–400 °C in combustion, which further decomposed at 400–650 °C and reacted with halogens. However, the ester bonds ruptured into aromatic nitro compounds and ethers at 200 °C below in pyrolysis. At higher temperature range of 200–500 °C, more halogenated derivatives were detected with lower intensity. In addition to the halogenated products such as chlorofluorocarbons, chlorobenzene, dichlorobenzene,o-chloroaniline, and trifluoroacetone, small molecules of hydrogen cyanide, ammonia, carbon dioxide, carbon monoxide were all detected.
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影响因子：
3.1
作者：
L. B. Valencia;T. Rogaume;É. Guillaume;G. Rein;J. Torero
通讯作者：
L. B. Valencia;T. Rogaume;É. Guillaume;G. Rein;J. Torero
DOI：
--
发表时间：
2013
期刊：
China Environmental Science
影响因子：
--
作者：
Li Jin-hu
通讯作者：
Li Jin-hu
DOI：
--
发表时间：
2010
期刊：
Environmental Pollution & Control
影响因子：
--
作者：
Qiao Qi
通讯作者：
Qiao Qi
影响因子：
6
作者：
Garrido, M. A.;Font, R.
通讯作者：
Font, R.
影响因子：
16.6
作者：
Burchert, Alexander;Yao, Shenglai;Driess, Matthias
通讯作者：
Driess, Matthias