Hexachlorobutadiene emissions from typical chemical plants  

作　　者：Minxiang Wang Lili Yang Xiaoyun Liu Zheng Wang Guorui Liu Minghui Zheng 

机构地区：[1]College of Geology and Environment,Xi’an University of Science and Technology,Xi’an,710054,China [2]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China [3]School of Environment,Hangzhou Institute for Advanced Study,UCAS,Hangzhou,310000,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第4期77-83,共7页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.21936007 and 21906165);the CAS Interdisciplinary Innovation Team(Grant No.JCTD-2019-03);and the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2016038).

摘　　要：Hexachlorobutadiene(HCBD)was classed as a persistent organic pollutant under the Stockholm Convention in 2015.HCBD is mainly an unintentionally produced by-product of chlorinated hydrocarbon(e.g.,trichloroethylene and tetrachloroethylene)synthesis.Few studies of HCBD formation during chemical production processes have been performed,so HCBD emissions from these potentially important sources are not understood.In this study,HCBD concentrations in raw materials,intermediate products,products,and bottom residues from chemical plants producing chlorobenzene,trichloroethylene,and tetrachloroethylene were determined.The results indicated that HCBD is unintentionally produced at much higher concentrations in trichloroethylene and tetrachloroethylene plants than chlorobenzene plants.The sum of the HCBD concentrations in the samples from all of the trichloroethylene and tetrachloroethylene production stages in plant PC was 247000µg/mL,about three orders of magnitude higher than the concentrations in the tetrachloroethylene production samples(plant PB)and about six orders of magnitude higher than the concentrations in the chlorobenzene production samples(plant PA).The HCBD concentrations were highest in bottom residues from all of the plants.The concentrations in the bottom residue samples contributed 24%–99%of the total HCBD formed in the chemical production plants.The bottom residue,being hazardous waste,could be disposed of by incineration.The HCBD concentrations were much higher in intermediate products than raw materials,indicating that HCBD formed during production of the intended chemicals.The results indicate the concentrations of HCBD unintentionally produced in typical chemical plants and will be useful in developing protocols for controlling HCBD emissions to meet the Stockholm Convention requirements.

关 键 词：Hexachlorobutadiene Chemical plant CHLOROBENZENE TRICHLOROETHYLENE TETRACHLOROETHYLENE 

分 类 号：X78[环境科学与工程—环境工程]