ο-キシレンのアンモ酸化
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概要
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Vapor-phase ammoxidation of .I-xylene and .I-tolunitrile over a fused vanadium oxide catalyst supported on Alundum carrier was studied in a flow system. Phthalonitrile, the main product, was formed via two parallel routes: (1) stepwise reactions through. ο-tolunitrile, and (2) direct formation from ο-xylene. At low conversion, the rate of phthalonitrile formation was faster than that of phthalimide. The amounts of phthalonitrile and phthalimide formed by the ammoxidation of ο-xylene and of ο-tolunitrile were almost comparable. The hydrolysis of phthalonitrile leading to phthalimide did not occur under the conditions tested. Though phthalimide undergoes oxidation over the catalyst, it becomes more stable in the presence of ο-tolunitrile. The ammoxidation of phthalimide proceeded faster than its oxidation, but the formation of phthalonitrile became independent of ammonia concentration at higher concetrations of ammonia. It was then suggested that phthalonitrile and phthalimide were formed by parallel reactions in which ammonia and/or water took part in their formation.
- 社団法人 有機合成化学協会の論文