Identification of heteroatom compounds
containing chlorine
and
oxygen in plastic waste pyrolysis oil (PWPO) is significant for processing.
A quantitative method for 32 chlorinated hydrocarbons in PWPO was
established by a gas chromatography-electron capture detector. Eight
chlorinated hydrocarbons were found in PWPO, accounting for 14.0%
of the total chlorine, with 1,2-dichloroethane having the highest
amount. 73 compounds in the polar fraction of PWPO were identified
using solid phase extraction and gas chromatography-mass spectrometry.
The proportions of these compounds in the polar fraction decreased
in the order of esters, nitriles, ketones, acids (including anhydride),
chloroesters, phenols, alcohols, ethers, aldehydes, trienes, and siloxanes.
The polar fraction contained nine chlorides. All of these chlorides
were in the form of 2-chloroethyl ester, and 1,4-benzenedicarboxylic
acid, di-2-chloroethyl ester, had the highest proportion among the
nine chlorides. Finally, the formation pathways of 2-chloroethyl esters
were illustrated. These results would provide support for the development
of a clean processing technology for PWPO.