Process for preparation of water soluble dyes containing lithium

Details Process for preparation of water soluble dyes containing lithium Process for preparation of water soluble dyes containing lithium

1986-09-15

1989-02-28

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8620, 8680, 8937, C09B 6754, C09B 6902

Patent

active

048081922

ABSTRACT:
In accordance with this invention an aqueous solution of a water-soluble dye containing lithium sulfonate group or ammonium sulfonate group can be obtained by a very simple and economical process in such a way that an aqueous solution of a water-soluble dye containing sodium sulfonate group is fed to a packed column packed with acid type cation exchange resin (H-form) to form an aqueous solution of a dye containing a free sulfonic acid group, and after neutralizing the resulting solution with LiOH or NH.sub.4 OH, the aqueous solution of the dye thus obtained is concentrated according to a process for separation through reverse osmotic membrane.

REFERENCES:
patent: 4002424 (1977-01-01), Smith
patent: 4077767 (1978-03-01), Bleck et al.
patent: 4260391 (1981-04-01), Lacroix
patent: 4560480 (1985-12-01), Lacroix et al.
patent: 4648883 (1987-03-01), Podder
patent: 4673410 (1987-06-01), Sandefur et al.
patent: 4702744 (1987-10-01), Wolff et al.

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