Purification of aqueous dye solutions

Details Purification of aqueous dye solutions Purification of aqueous dye solutions

1999-06-29

2000-11-28

Richter, Johann

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

Organic compounds

Sulfonic acids or salts thereof

562 43, 562 67, 564250, 564279, 568306, 568438, C07C20928, C07C25104

Patent

active

061537896

ABSTRACT:
The present invention provides a method of purifying an aqueous dye solution having an aldehyde and/or ketone impurity including a step of reacting the impurity with a hydrazine derivative, forming a water-insoluble hydrazone compound. The hydrazone compound is then removed from the solution to form a dye having an increased purity.

REFERENCES:
Database Caplus on STN, Acc. No. 1975:98725, Furuhashi et al., [Removal of aldehydes and ketones.]JP 49095920 A2 (abstract), 1975.

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