Bleaching and dyeing; fluid treatment and chemical modification – Dye concentrate composition wherein an additional amount of...
Patent
1985-04-04
1986-04-29
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Dye concentrate composition wherein an additional amount of...
8549, 8685, 534575, 534618, 534652, C09B 6700
Patent
active
045854599
ABSTRACT:
A process is described for separating sodium sulfate from aqueous solutions, containing less than 2% by weight of chloride, of certain fiber-reactive copper-formazan dyestuffs wherein this dyestuff solution is cooled down 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 products obtained in this way are liquid low-salt aqueous copper-formazan dyestuff preparations 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: 4336190 (1982-06-01), Schwaiger et al.
patent: 4443224 (1984-04-01), Opitz
Opitz Konrad
Schwaiger Gunther
Clingman A. Lionel
Hoechst Aktiengesellschaft
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