Studies on formation of volatile chlorinated organic compounds by aqueous chlorination of aromatic hydrocarbons.

Abstract

The formation of chloroform (CHCl₃), carbontetrachloride (CCl₄), trichloroethylene (CHClCCl₂) and tetrachloroethylene (CCl₂CCl₂) after aqueous chlorination of aromatic hydrocarbons such as p-quinone (PQ), hydroquinone (HQ), catecoal (CA), p-hydroxy benzoic acid (PHBA), salicylic acid (SA) and benzoic acid (BA) was investigated.
The following results were obtained.
1) It is recognized that 6 compounds are CHCl₃, CCl₄, CHClCCl₂, CCl₂CCl₂ precursors.
2) CHCl₃ formation potential was increased by high pH value, but formation potentials of CCl₄, CHClCCl₂, CCl₂CCl₂ were increased by low pH value during aqueous chlorination.
3) Aromatic hydrocarbons which have substituent group in the paraposition produced volatile chlorinated organic compounds more than those in the ortho-position.
4) The effect of the ozonation of compounds was obserbed that the formation potentials of volatile chlorinated organic compounds were classifyed increasing group and decreasing group.