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    • 7. 发明专利
    • PRODUCTION OF INDOLE
    • JPS61151171A
    • 1986-07-09
    • JP27274884
    • 1984-12-26
    • MITSUI TOATSU CHEMICALS
    • YAMAUCHI ATSUROIGUCHI SEIYAONO YUZOKIMURA HIROSHIMORITA SATOSHI
    • C07D209/04C07D209/08
    • PURPOSE:To obtain high-purity indole by a simple process, by subjecting aniline and ethylene glycol to gaseous-phase contact reaction in the presence of a catalyst, separating and removing previously a high-boiling impurity, etc. from the prepared reaction product, and carrying out rectification. CONSTITUTION:Aniline which is previously vaporized by an evaporator is brought into contact with ethylene glycol in the presence of a solid acid catalyst or a metallic catalyst (supported on a carrier) at 0.01-10hr10 liquid space velocity (LHSV) at 200-600 deg.C at 1.1X10 -1.0X10 Pa pressure to give a reaction product, from which a high-boiling impurity and an nonvolatile substance are separated and removed, and rectification is carried out to give high-purity indole. EFFECT:In rectification of indole, a high-boiling impurity and a nonvolatile substance which remain in a rectification column after distillation of aniline and produce aniline gradually by thermal decomposition are previously removed, so occurrence of aniline is prevented, and purification is easily carried out. USE:An industrial raw material for perfume, dye, etc., a raw material for synthesizing amino acid, etc.