Purification of indigo

Details Purification of indigo Purification of indigo

1994-10-21

1996-07-16

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548458, C07D40304

Patent

active

055368425

ABSTRACT:
A process for purifying indigo comprises extracting an aqueous leuco indigo alkali metal salt solution with an inert solvent under oxygen-excluding conditions and conventionally regenerating the indigo by oxidation.

REFERENCES:
patent: 5075458 (1991-12-01), Kohlhaupt et al.
patent: 5109137 (1992-04-01), Kohlhaupt et al.
patent: 5116996 (1992-05-01), Kohlhaupt et al.
patent: 5116997 (1992-05-01), Kohlhaupt

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