Purification of indigo

Details Purification of indigo Purification of indigo

1991-04-15

1992-05-26

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548458, C09B 700

Patent

active

051169975

ABSTRACT:
A process for the purification of indigo comprises treating the indigo with sulfuric acid to give indigo sulfate, separating off and subsequently hydrolyzing the latter to re-form indigo, and then treating the dye with dilute hydrogen peroxide solution.

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