ジフェニルエーテル系除草剤クロロニトロフェン(CNP)の熱化学反応による塩素化ジベンゾフランの生成

概要

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In order to obtain information on the thermochemical reactions of chloronitrofen (CNP) upon burning off dead grass and combustion of municipal solid wastes, pyrolysis of this compound, CNP, in a quartz glass reaction tube at 200-800℃ under an air stream was performed and the obtained reaction products were analysed by GC-MS. GC-MS analyses of the evolved gaseous products and residues show that CNP began to decompose at 300℃ and 90% of the original CNP disappeared at 500℃. Pyrolysis of CNP under an air stream was also shown to produce a variety of compounds, including nitrofen (NIP), polychlorinated diphenylethers (PCDPEs) and dibenzofurans (PCDFs). The formation of PCDPEs (mainly T_3CDPE and T_4CDPE) was observed on heating over 400℃ and the maximum yield of these compounds was ca. 7.5 mol% of CNP at 600℃. The production of PCDFs (mainly DCDF and T_3CDF) was also detected on heating over 400℃ and the maximum yield of these compounds was ca. 0.5 mol% of CNP at 500℃. On the basis of these results, it can be presumed that the thermochemical reactions of CNP under an air stream start with denitrozation of CNP to form PCDPEs, and then followed by the decomposition and thermal ring closure of PCDPEs to form a small amount of PCDFs.
1997-10-31