Purification of indigo

Details Purification of indigo Purification of indigo

1991-07-15

1992-04-28

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548459, C09B 700

Patent

active

051091372

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: 702730 (1902-06-01), Homolka
patent: 1644493 (1927-10-01), Rogers
patent: 4973706 (1990-11-01), Yamamoto et al.

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