Pyrolysis study of halogen-containing aromatics reflecting reactions with polypropylene in a posttreatment decontamination process

被引:22
作者
Balabanovich, AI
Hornung, A
Luda, MP
Koch, W
Tumiatti, V
机构
[1] Belarusian State Univ, Res Inst Phys Chem Problems, Minsk 220050, BELARUS
[2] Forschungszentrum Karlsruhe, ITC, TAB, D-76344 Eggenstein Leopoldshafen, Germany
[3] Univ Turin, Dipartimento Chim IFM, I-10125 Turin, Italy
[4] Sea Marconi Technol Sas, I-10097 Collegno, Italy
关键词
D O I
10.1021/es0500106
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Halogen-containing aromatics, mainly bromine-containing phenols, are harmful compounds contaminating pyrolysis oil from electronic boards containing halogenated flame retardants. In addition, their formation increases the potential for evolution of polybrominated dibenzo-p-dioxins (PBDDs) and dibenzofurans (PBDFs) at relatively low temperature (up to 500 degrees C). As a model compound, 2,4-di bromo phenol (DBP) was pyrolyzed at 290-450 degrees C. While its pyrolysis in a nitrogen flow reactor or in encapsulated ampules yields bromine-containing phenols, phenoxyphenols, PBDDs, and PBDFs, pyrolysis of DBP in a hydrogen-donating medium of polypropylene (PP) at 290-350 degrees C mainly results in the formation of phenol and HBr, indicating the occurrence of a facile hydrodebromination of D13P. The hydrodebromination efficiency depends on temperature, pressure, and the ratio of the initial components. This thermal behavior of DBP is compared to that of 2,4-dichlorophenol and decabromodiphenyl ether. A treatment of halogen-containing aromatics with PP offers a new perspective on the development of low-environmental-impact disposal processes for electronic scrap.
引用
收藏
页码:5469 / 5474
页数:6
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