Distillation: processes – separatory – Plural distillations performed on same material – Distillation of initial distillate
Patent
1987-07-15
1988-03-22
Schor, Kenneth M.
Distillation: processes, separatory
Plural distillations performed on same material
Distillation of initial distillate
203 71, 548508, B01D 314, C07D20904
Patent
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.
Iguchi Seiya
Kimura Hiroshi
Morita Satoshi
Ono Yuzo
Yamauchi Atsuyoshi
Mitsui Toatsu Chemicals Inc.
Schor Kenneth M.
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