Process for converting sparingly soluble salts of anionic dyes a

Details Process for converting sparingly soluble salts of anionic dyes a Process for converting sparingly soluble salts of anionic dyes a

1983-06-13

1985-12-24

Spear, Frank

Liquid purification or separation

Processes

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

210641, B01D 1300

Patent

active

045604800

ABSTRACT:
A process is described for converting sparingly soluble salts of anionic dyes and fluorescent brighteners into more soluble salts by means of cation exchange without intermediate isolation of the free dye acid, which comprises carrying out the cation exchange by using Donnan dialysis.
The concentrated dye and brightener solutions obtained in this way are stable and can be directly used for dyeing or printing textile material.

REFERENCES:
patent: 3905949 (1975-09-01), Perkins et al.
patent: 4306946 (1981-12-01), Kim
Techniques of Chemistry, vol. 7, "Membranes in Separations", Sun-Tak Hwang, (1975), pp. 166-173.

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