モノアルキルベンゼンのアンモ酸化
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概要
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The kinetics of vapor-phase ammoxidation of toluene and various monoalkylbenzenes over vanadium oxide catalysts supported on alundum carrier was studied in a flow system. The rate of reaction of toluene and the rate of benzonitrile formation were independent of the concentrations of toluene and ammonia in the presence of excessive amounts of oxygen and ammonia. Benzonitrile, carbon dioxide, and hydrogen cyanide were formed concurrently. At low concentration of ammonia, the oxidation into benzoic acid became competitive with benzonitrile formation. Though the rate of oxidation of benzaldehyde was markedly depressed by the presence of toluene, the rate of ammoxidation of benzaldehyde in the presence of toluene was far faster than that of oxidation. It was then suggested that the formation of benzonitrile by way of benzoic acid was insignificant. In the ammoxidation of n-propylbenzene, phthalonitrile and phthalimide were formed in yields up to 20% in addition to benzonitrile. Their formation was assumed to involve a cyclic intermediate.
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