Purification of indigo

Details Purification of indigo Purification of indigo

1991-04-15

1991-12-24

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40304

Patent

active

050754580

ABSTRACT:
A process for the preparation of purified indigo comprises extracting the aqueous alkaline indoxylate solution arising from the synthesis with an inert water-insoluble solvent in the absence of oxygen before oxidizing the indoxylate solution to give indigo.

REFERENCES:
patent: 4966979 (1990-10-01), Takaki et al.

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