Process for isolating sulphur dyestuffs from aqueous crude melts

Details Process for isolating sulphur dyestuffs from aqueous crude melts Process for isolating sulphur dyestuffs from aqueous crude melts

1980-10-17

1982-01-05

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Ethylenimine or polymer thereof or polyalkylene polyamine

8555, 8558, 8652, C09B 4900

Patent

active

043091784

ABSTRACT:
In the processs for isolating solid sulphur dyestuffs from crude sulphur dyestuff melts, the improvement comprises adding 10.sup.-4 to 1% by weight, relative to the amount of dyestuff, of an organic flocculating auxiliary to the crude dyestuff melt to produce a filterable dyestuff precipitate and then separating said precipitate.

REFERENCES:
patent: 2373261 (1945-04-01), Robinson et al.
patent: 2801995 (1957-08-01), Strouse
patent: 3600121 (1971-08-01), Feldmann

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