Process for the preparation of concentrated aqueous dye formulat

Details Process for the preparation of concentrated aqueous dye formulat Process for the preparation of concentrated aqueous dye formulat

1988-04-15

1989-07-25

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8436, 8524, 8919, C09B 6754, D06L 3112

Patent

active

048510114

ABSTRACT:
Concentrated aqueous dye formulations of water-soluble organic dyes are prepared by desalination and concentration of corresponding crude dye solutions by means of membrane separation processes. The effectiveness of the membrane separation process on the one hand and the stability of the dye formulations on the other hand is improved if dye solutions are subjected to cross-flow microfiltration before and/or after the membrane separation process and insoluble constituents are thus removed.

REFERENCES:
patent: 4689048 (1987-08-01), Fortsch et al.
patent: 4690765 (1987-09-01), Linder et al.
W. Klein et al., 1982, Chem. Eng., 369-372, Oct. 1982.

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