無水フタル酸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 preparation of tetrahalophthalic anhydride with a vapor phase catalytichalogenation of phthalic anhydride, the thermal halogenation and the activities of various halogenation catalysts were investigated. The velocity of thermal bromination was slower than that of thermal chlorination and the decomposition reaction occurred more easily in the former. Solid acids, such as alumina gel, silica gel, etc., accelerated the chloronation, especially with decomposition giving mainly hexachlorobenzene. Activated carbon gave hexachlorobenzene and pentachlorobenzoic acid in case of chloriantion and gave hexabromobenzene, in case of bromination. Among metal chloride type catalysts, ferric chloride showedespecially high chlorination activity and gave tetrachlorophthalic anhydride in the yield of 54 mol%.
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