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    • 220. 发明专利
    • PRODUCTION OF INDOLE
    • JPS63156770A
    • 1988-06-29
    • JP30587686
    • 1986-12-22
    • KAWASAKI STEEL CO
    • TANAKA MAKOTOHOTTA TSUGIOTAKEO SETSUSAKOTA NAOICHI
    • C07D209/06C07D209/04
    • PURPOSE:To obtain indole in high recovery ratio and advantageously, by separating indole from an indole-containing oil with an acid as an oligomer salt, deacidifying the oligomer salt in the presence of an aromatic hydrocarbon, then regenerating the oligomer salt, deacidifying again and thermally decomposing the oligomer. CONSTITUTION:An indole-containing oil such as coal tar is brought into contact with an acid, indole is separated as an oligomer salt, which is deacidified with a basic substance in the presence of an aromatic hydrocarbon. Then the deacidified oligomer is brought into contact with an acid again to give an oligomer salt, which is separated and deacidified with a basic substance. Further the deacidified oligomer is thermally decomposed to give indole useful as a raw material for drugs and agricultural chemicals. By this method, almost perfect indole can be recovered independently of concentration of indole and indole can be recovered in high yield as a high-purity indole oil especially from an indole-containing oil having low indole content.