Process for preparing liquid low-salt aqueous reactive dyestuff

Details Process for preparing liquid low-salt aqueous reactive dyestuff Process for preparing liquid low-salt aqueous reactive dyestuff

1985-04-04

1986-04-08

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8549, 8641, 8673, 8681, 8682, 8686, 8687, 8690, 8692, 8696, C09B 6700, C09B 6200

Patent

active

045810362

ABSTRACT:
A process is described for separating sodium sulfate from aqueous solutions of certain fiber-reactive dyestuffs, which contain less than 2% by weight of chloride, by cooling down said solution to a temperature between +5.degree. C. and -15.degree. C. In the course of the cooling, the sodium sulfate precipitates in the form of the decahydrate and can be separated off in conventional manner, for example by filtration. The results obtained in this way are aqueous liquid low-salt preparations of these dyestuffs which contain less than 4% by weight of sodium sulfate.

REFERENCES:
patent: 4072463 (1978-02-01), Schlafer et al.
patent: 4078884 (1978-03-01), Opitz et al.
patent: 4149850 (1979-04-01), Schlafer et al.
patent: 4315865 (1982-02-01), Hoyer et al.
patent: 4443224 (1984-04-01), Opitz et al.

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