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The behavior of heteroatom compounds during the pyrolysis of waste computer casing plastic under various heating conditions
Journal of Cleaner Production ( IF 9.7 ) Pub Date : 2019-02-13 , DOI: 10.1016/j.jclepro.2019.02.100
Chuan Ma , Qianqian Yan , Jie Yu , Tao Chen , Dingshun Wang , Sheng Liu , Kagiso Bikane , Lushi Sun

Single step and two-step pyrolysis of waste computer casing plastic were conducted to optimize both the product distribution and characteristics of liquid products. The single step pyrolysis was performed under various final temperatures ranging from 350 to 600 °C. The two-step pyrolysis was undertaken by initially increasing the temperatures to 350–380 °C and holding for 15 min, followed by a further increase to a peak temperature of 500 °C. The pyrolysis kinetic studies showed the activation energy of the two stages against conversion and revealed the synergistic reactions between BFR additives and plastic matrix. In the single step pyrolysis, fixed bed experiments showed that the final pyrolysis temperature had a significant influence on the product yield. The highest yield of 45.3 wt% oil was produced at 500 °C. The oil products mainly consisted of aromatic compounds, phenolic compounds, nitrogen-containing compounds, and approximately 11.3–15.9 wt% of toxic bromine. For the two-step pyrolysis, the impurities of O-, N- and Br-containing compounds were mainly enriched in the pyrolytic oils from the first step. Comparatively, more than 57% of single aromatic compounds was obtained in the pyrolytic oils from the second step, with less than 2.0 wt% of bromine. Meanwhile, the depolymerization of the plastic for the formation of styrene was promoted at the second step. The results suggested that in the two stage pyrolysis, bromine can be transferred into the liquid phase in the first stage, thus producing bromine containing compounds deficient oil in the second stage.



中文翻译:

各种加热条件下废旧计算机外壳塑料热解过程中杂原子化合物的行为

对废旧计算机外壳塑料进行单步和两步热解,以优化液体产品的产品分布和特性。单步热解是在350至600°C的各种最终温度下进行的。分两步进行热解,首先将温度提高到350-380°C,并保持15分钟,然后再将其进一步升高到500°C的峰值温度。热解动力学研究表明,这两个阶段的转化能均受转化的影响,并且揭示了BFR添加剂与塑料基质之间的协同反应。在单步热解中,固定床实验表明最终热解温度对产物收率有显着影响。在500°C时,油的最高收率为45.3 wt%。石油产品主要由芳族化合物,酚类化合物,含氮化合物和约11.3–15.9 wt%的有毒溴组成。对于两步热解,从第一步开始,含O,N和Br的化合物的杂质主要富含热解油。比较而言,在第二步的热解油中获得了多于57%的单一芳族化合物,其中溴的含量不到2.0 wt%。同时,在第二步骤中促进了用于形成苯乙烯的塑料的解聚。结果表明,在两个阶段的热解中,溴可在第一阶段转移到液相中,从而在第二阶段产生含溴化合物,即缺乏油的化合物。以及约11.3–15.9 wt%的有毒溴。对于两步热解,从第一步开始,含O,N和Br的化合物的杂质主要富含热解油。比较而言,在第二步的热解油中获得了多于57%的单一芳族化合物,其中溴的含量不到2.0 wt%。同时,在第二步骤中促进了用于形成苯乙烯的塑料的解聚。结果表明,在两个阶段的热解中,溴可在第一阶段转移到液相中,从而在第二阶段产生含溴化合物,即缺乏油的化合物。以及约11.3–15.9 wt%的有毒溴。对于两步热解,从第一步开始,含O,N和Br的化合物的杂质主要富含热解油。比较而言,在第二步的热解油中获得了多于57%的单一芳族化合物,其中溴的含量不到2.0 wt%。同时,在第二步骤中促进了用于形成苯乙烯的塑料的解聚。结果表明,在两个阶段的热解中,溴可在第一阶段转移到液相中,从而在第二阶段产生含溴化合物,即缺乏油的化合物。在第二步的热解油中,多于57%的单一芳族化合物与少于2.0 wt%的溴一起获得。同时,在第二步骤中促进了用于形成苯乙烯的塑料的解聚。结果表明,在两个阶段的热解中,溴可以在第一阶段转移到液相中,从而在第二阶段产生含溴的化合物,其缺乏油。在第二步的热解油中,多于57%的单一芳族化合物与少于2.0 wt%的溴一起获得。同时,在第二步骤中促进了用于形成苯乙烯的塑料的解聚。结果表明,在两个阶段的热解中,溴可在第一阶段转移到液相中,从而在第二阶段产生含溴化合物,即缺乏油的化合物。

更新日期:2019-02-13
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