Preparation process of indole

Distillation: processes – separatory – Plural distillations performed on same material – Distillation of initial distillate

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203 71, 548508, B01D 314, C07D20904

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active

047326549

ABSTRACT:
In an industrial process for preparing indole by reacting aniline and ethylene glycol, high boiling-point impurities and non-volatile substances are removed in advance from the reaction mixture either before the recovery of aniline from the reaction mixture or before the subsequent rectification of the resultant indole. Indole of a high purity can thus be obtained.

REFERENCES:
patent: 2758071 (1956-08-01), Biribauer
patent: 2953575 (1960-09-01), Erner et al.
patent: 4032411 (1977-06-01), Tornquist et al.
patent: 4404063 (1983-09-01), Honda
patent: 4473698 (1984-09-01), Matsuda et al.
patent: 4474969 (1984-10-01), Honda et al.
Patent Abstracts of Japan, C Field: (1) vol. 5, No. 106, Jul. 10, 1981, (2) vol. 7, No. 131, Jun. 8, 1983, (3) vol. 7, No. 209, Sep. 14, 1983.

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