Method of stripping dyes from high-boiling non-ionic media

Details Method of stripping dyes from high-boiling non-ionic media Method of stripping dyes from high-boiling non-ionic media

1987-04-15

1988-06-28

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

B01D 1104

Patent

active

047537329

ABSTRACT:
Dyes are removed from waterless dye compositions by mixing the dyeing composition, composed of one or more dyes in a high-boiling, nonionic liquid, with an extraction solvent that is immiscible with the high-boiling liquid, yet solubilizes the dye. The dye laden extraction solvent is separated as a separate phase from the high-boiling, nonionic liquid medium.

REFERENCES:
patent: 4047889 (1977-09-01), Hermes
patent: 4165217 (1979-08-01), Kitamura et al.
patent: 4529405 (1985-07-01), Wilson

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