摘要
聚氨酯材料是一种应用前景广阔的高聚物材料,废弃聚氨酯制品具有热固性的特点,导致无法直接挤塑再利用,但它的热值与燃料煤相当,对其进行热处理可利用其热值还可减量化.聚氨酯在热处理过程中可能生成HCN、NO_(x)和氨气等二次污染物,报道认为生活垃圾与废弃聚氨酯的协同处理能够阻滞二噁英类物质的生成,但并未研究其机理.因此,本实验以二噁英类物质的前驱物氯苯作为研究对象,初步研究聚氨酯热解过程中氯苯类物质变化.结果表明,废弃聚氨酯存在时1,2,3-三氯苯的最大降解率为70%.废弃聚氨酯对1,2,3-三氯苯的脱氯降解率是空白组的3.5倍,脱氯生成二氯苯的量随着温度升高而增多,1-氯苯只有在450~500℃和500~550℃反应条件生成,500~550℃条件下的生成量为450~500℃下的8倍.在所有实验中均发现了1,3,5-三氯苯,其生成量随温度升高呈先增高后下降的趋势,产量最高的温度区间为350~400℃,可能是由1,3-二氯苯加氯生成.研究表明,废弃聚氨酯能够促进1,2,3-三氯苯的降解,最佳降解温度区间为500~550℃.
Polyurethane material is a kind of polymer material with great application prospects,Waste polyurethane products have thermosetting characteristics,resulting in the inability to directly extrude and reuse,but its calorific value is comparable to that of fuel coal,and its heat treatment can be utilized to make use of its calorific value as well as to reduce its quantity.Polyurethane may generate secondary pollutants such as HCN,NOX and ammonia during the heat treatment process,and it is reported that the synergistic treatment of waste polyurethane and domestic waste can block the generation of dioxins,but the mechanism has not been studied.Therefore,this experiment takes chlorobenzene,a precursor of dioxins,as the research object,and preliminarily researches the changes of chlorobenzenes in the process of polyurethane pyrolysis.The results showed that the maximum degradation rate of 1,2,3-trichlorobenzene in the presence of waste polyurethane was 70%.The dechlorination degradation rate of 1,2,3-trichlorobenzene by waste polyurethane was 3.5 times higher than that of the blank group,and the amount of dichlorobenzene generated by dechlorination increased with the increase of temperature,1-Chlorobenzene was generated only in the reaction condition of 450~500℃ and 500~550℃,and the amount of the generation of 1,2,3-trichlorobenzene in the reaction condition of 500~550℃ was 8 times of that of 450~500℃,and the amount of the generation of 1,3,5-trichlorobenzene in all the experiments was found,and it showed a tendency of increasing and then decreasing with the increase of temperature,and the temperature interval with the highest yield was 350~400℃,which might be generated by chlorination of 1,3-dichlorobenzene.The conclusion of this study is that waste polyurethane can promote the degradation of 1,2,3-trichlorobenzene,and the optimal degradation temperature range is 500~550℃.
作者
翟宏广
吕溥
陈雨
彭佳
邱银权
田永静
李金惠
ZHAI Hongguang;LU Pu;CHEN Yu;PENG Jia;QIU Yinquan;TIAN Yongjing;LI Jinhui(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009;Research Institute for Environmental Innovation(Suzhou),Suzhou 215163;School of Environment,Tsinghua University,Beijing 100084;National Joint Research Center for Ecological Conservation and High Quality Development of the Yellow River Basin,Beijing 100012;Hebei Provincial Solid Waste Pollution Control Center,Shijiazhuang 050051;Grandblue Environment Co.,Ltd,Foshan 528200;Beijing Municipal Pollution Source Management Center,Beijing 100074)
出处
《环境科学学报》
北大核心
2025年第7期370-379,共10页
Acta Scientiae Circumstantiae
基金
国家重点研发计划(No.2024YFC3909402)
黄河流域生态保护和高质量发展联合研究项目(No.2022-YRUC-01-050205-03)。
关键词
废弃聚氨酯
氯苯
热降解
降解机理
POPS
waste polyurethane
chlorobenzene
thermal degradation
mechanism of degradation
POPs
