Study on the Normalized Reaction Rate of Congeners for the Photochemical Dechlorination of PCBs

概要

論文の詳細を見る
In order to achieve the design of a large-scale, photochemical dechlorination reactor for PCB products, the dechlorination rate constants of 64 congeners were calculated from results in existing literature. Next, equations for the normalization of rate constants between different experiments were created. Experimental results showed the apparent rate constants were proportional to the ultraviolet ray energy that entered the PCB in each case.<BR>The photochemical dechlorination reaction showed the following three characteristics. (1) the step reaction reduced chlorine one at a time and was a first-order reaction, (2) the final product was biphenyl from monochlorobiphenyl, and (3) 3-chlorobiphenyl and 4-chlorobiphenyl seemed to be the apparent intermediate products. Based on these characteristics, the simplified reaction scheme to biphenyl and the rate equation were estimated considering dechlorination rate constants.<BR>Finally, the validity of the apparent dechlorination rate constants of 64 congeners were examined by comparative evaluations of experimental results using commercial PCBs and the estimated rate equation.