Process for converting sparingly soluble inorganic salts of cati

Details Process for converting sparingly soluble inorganic salts of cati Process for converting sparingly soluble inorganic salts of cati

1983-06-13

1985-12-17

Spear, Frank

Liquid purification or separation

Processes

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

210641, B01D 1300

Patent

active

045591440

ABSTRACT:
A process is described for converting sparingly soluble inorganic salts of cationic dyes and brighteners into more soluble salts of organic acids without intermediate isolation of the free base, wherein the counter-ion of the dye or brightener cation is replaced by the anion of a cyclic or acyclic organic acid by means of Donnan dialysis.
Dye or brightener solutions obtained in this way are stable and can be directly used for dyeing or printing textile materials.

REFERENCES:
patent: 4095943 (1978-06-01), Lang
patent: 4306946 (1981-12-01), Kim
S. T. Hwang and K. Kammermayer, "Membranes in Separation", Wiley & Sons (1975) pp. 166-173.

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