Process for the preparation of formulations of water-soluble org

Details Process for the preparation of formulations of water-soluble org Process for the preparation of formulations of water-soluble org

1986-03-28

1987-08-25

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

8527, 8528, 8680, 2105002, 210650, 210651, 210683, 2105001, C09B 6754

Patent

active

046890483

ABSTRACT:
A process for the preparation of formulations of water-soluble organic dyes starting from an aqueous salt-containing suspension of the untreated dye and using membrane separation methods, which process comprises substantially freeing the aqueous suspension of the untreated dye from by-products and reducing the salt concentration by more than half in a first membrane separation treatment, then diluting the dye suspension in a further optional step and effecting deionization and concentration in a second membrane separation treatment and converting the concentrate so obtained into a liquid or solid commercial formulation. This multi-step membrane separation process, e.g. ultrafiltration combined with hyperfiltration, results in a high rate of permeation through the membrane and avoids operating problems caused by membrane clogging.

REFERENCES:
patent: 4247401 (1981-01-01), Bloch et al.
patent: 4390342 (1983-06-01), Bruttel et al.
patent: 4523924 (1985-06-01), Lacroix
patent: 4584103 (1986-04-01), Linder et al.
patent: 4604204 (1986-08-01), Linder et al.

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