Bleaching and dyeing; fluid treatment and chemical modification – Dye recovery process – other than nominal recovery
Patent
1996-12-12
1998-06-30
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Dye recovery process, other than nominal recovery
8588, 8589, 8618, 8620, 8625, 8628, 8614, 8662, 8938, C09B 6734
Patent
active
057726965
ABSTRACT:
An invention is disclosed which pertains to a method for purifying water soluble dyes, such as quinoline, fluoran, and xanthene dyes. The method comprises the steps of A) adding a metal salt to the water soluble dye to form a water insoluble dye salt of the metal; B) isolating the water insoluble dye salt of step A; C) converting the water insoluble dye salt of step B into a water soluble dye solution; and D) isolating the water soluble dye from the solution of step C. The present invention teaches a straight forward, economical, and environmentally sound method for purifying water soluble dyes of FDA certifiable purity and with an aesthetically improved shade.
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Einsmann Margaret
Warner-Jenkinson Company, Inc.
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