Ultrafiltration process for purification of dyes useful in foods

Details Ultrafiltration process for purification of dyes useful in foods Ultrafiltration process for purification of dyes useful in foods

1984-11-30

1985-12-24

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534554, 534883, 534884, 534887, C09B 2916, C09B 6754, C09B 6900

Patent

active

045607460

ABSTRACT:
The disodium salt of 1-[(6-methoxy-4-sulfo-3-methylphenyl)azo]-2-naphthol-6-sulfonic acid (FD and C Red 40), the disodium salt of 1-[(4-sulfophenyl)azo]-2-naphthol-6-sulfonic acid (FD and C Yellow 6), the trisodium salt of 1-[1-(4-sulfonaphthyl)azo]-2-naphthol-3,6-disulfonic acid (FD and C Red 2), the disodium salt of 2-[1-(4-sulfonaphthyl)azo]-1-naphthol-4-sulfonic acid (Carmoisine) and the sodium salt of 2-(2-quinolyl)-1,3-indanedione-sulfonic acid (D and C Yellow 10) are prepared and purified in high yield and in a high state of purity by subjecting their aqueous reaction mixtures to ultrafiltration through a membrane of such structure and under such conditions that the impurities are separated from the reaction mixtures, and the products are concentrated in high purity concentrates from which the products can be isolated directly by evaporation of the solvent.

REFERENCES:
patent: 3249444 (1966-05-01), Bollenback et al.
patent: 3544455 (1970-12-01), Adams et al.
patent: 4165288 (1979-08-01), Teed et al.
patent: 4189380 (1980-02-01), Booth et al.
Colour Index, 3rd Edition, vol. 4, p. 4087, #15985, (1971).
Osmonics, Inc. Bulletin No. 109, Mar. 1978.
Spatz I, D. Dean, Reverse Osmosis/Ultrafiltration Application to Water Reuse and Material Reclamation, 5-1-75.
Spatz II, D. Dean, Industrial Wastes, Jan.-Feb. 1974, pp. 20-24.

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