フタロニトリルの気相接触ハロゲン化に関する研究(第1報), : 熱ハロゲン化および触媒の探索

概要

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For the purpose of synthesis of tetrahalophthalonitrile by vapor phase cataly tichalogenation of phthalonitrile, thermal halogenation of phthalonitrile and the activity of various substances for catalytic halogenation were investigated. The reaction velocity of vapor phase thermal bromination was far slower than that of thermal chlorination. Initial activity of metal halides such as ferric chloride or cupric chloride was fairly large but it was not found suitable to be used because a metal phthalocyanine was formed by the reaction of the metal salts with ophthalonitrile, resulting in the rapid decrease of catalyst activity. Although an initial activity of alumina gel was large but it showed decrease in activity during the reaction. Activated carbon became less active during the reaction due to the lower stability of brominated product in bromination compared with the chlorinated product but it showed no decrease in activity in case of chloriination, gave the yield over 90% of tetrachlorophthalonitrile and was found to be the most superior catalyst for this purpose.
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