Preparation process of indole

Details Preparation process of indole Preparation process of indole

C - Chemistry, Metallurgy

07

D

260/319.7

C07D 209/08 (2006.01)

Patent

CA 1172643

PREPARATION PROCESS OF INDOLE Abstract Disclosed herein is an improved preparation process of indole from aniline and ethylene glycol. Upon preparing indole by reacting aniline and ethylene glycol in a gas phase and in the presence of a catalyst, ethylene glycol is charged in portions to a multiplicity of catalyst stages formed by dividing a catalyst bed and connected in series. This divided supply of ethylene glycol permits to make the concentration of ethylene glycol in the catalyst bed uniform and is thus effective to suppress the decomposition of ethylene glycol due to development of localized heat spots, even if the molar ratio of feed aniline to total feed ethylene glycol is small. The above process permits to make the molar ratio of feed aniline to total feed ethylene glycol small so as to reduce the amount of unreacted aniline to be separated and recovered from the reaction effluent.

410126

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