Chain Dechlorination of Organic Chlorinated Compounds in Alcohol Solutions by 60Co γ-Rays, (I):Pentachlorobenzene in Various Alkaline Alcohol Solutions

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A study was made on radiolytic dechlorination of pentachlorobenzene in alkaline alcohol solutions. The dechlorination yield (G(C1-)) was found to depend on the alco-hols used as solvent and the concentrations of the chlorinated benzene and hydroxide ion. The high yields obtained in alkaline 2-propanol, sec-butanol and ethanol indicate a chain process in the dechlorination reaction. The value of G(C1-) was highest in 2-propanol, and the principal products generated were potassium chloride, acetone and the lower chlorinated benzenes, while a decrease was seen in the hydroxide ion concen-tration. The concentrations produced of potassium chloride and acetone, as well as the decrease in hydroxide ion concentration, are all roughly equal at all doses. With in-creasing irradiation dose, pentachlorobenzene was dechlorinated to tetra, tri, di and and monochlorobenzene. 1, 2, 4, 5-tetrachlorobenzene, 1, 2, 4-trichlorobenzene and 1, 4- dichlorobenzene were main products. A discussion is given of the detailed mechanism of the dechlorination in alkaline alcohols and the effect of alcohols on G(C1-).
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