1,1,2,2-テトラクロルエタンよリパークロルエチレンの直接合成法に関する研究(第4報) : 1,1,2,2-テトラクロルエタンと酸素の反応

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A direct synthetic method of perchloethylene with tetrachloroethane and oxygen, applying Deacon reaction, has been investigated. At first the catalyst to be used for Deacon reaction was studied, and it was found that copper chloride and potassium chloride on silica gel is suitable. As reaction condition, temperature of above 400°c and hydrogen chloride : oxygen mole proportion of 4:1 (same as theoretical) were preferable. Secondly the reaction between tetrachloroethane and oxygen, using this copper chloride-potassium chloride silica gel catalyst, has been investigated. Perchloroethylene was formed in this reaction, and the velocity of its formation was about the same as that of the thermal reaction of tetrachloroethane and chlorine. The rate of Deacon reaction, taking place simultaneously in the tetrachloroethane-oxygen reaction, is much faster than that of singl Deacon reaction. However, the rate-determining step of tetrachloroethane-oxygen reaction is found to be existed in the step of Deacon reaction. The catalyst accelerates substitution chlorination of trichloroetylene, but is no use in the reaction of tetrachloroethane itself. Oxygen is consumed mainly in Deacon reaction.
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