Method of recovering oxidized dye from dye wash water

Details Method of recovering oxidized dye from dye wash water Method of recovering oxidized dye from dye wash water

1977-02-18

1978-05-30

Schofer, Joseph L.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 80, 210 42R, 210 44, 210 60, C09B 700, D06P 500, B01D 1506

Patent

active

040921050

ABSTRACT:
Vat and sulfur dyes are recovered from caustic wash water containing oxidized dye by adding ions of aluminum, chromium, ferric iron, lead, or tin and reducing the pH of the wash water to between 6 and 6.8 and separating the precipitate formed for recycling into the dyeing process.

REFERENCES:
patent: 1303426 (1919-05-01), Wall
patent: 2242139 (1941-05-01), Munroe
patent: 3418236 (1968-12-01), Mail
Chem. Abstr., vol. 34, 1185.sup.3 (1940), vol. 77, 143607d, vol. 82, 174970z, Jun. 1975.
Sienko; M. J., Chemistry 2nd ed., McGraw-Hill, N. Y., 1961, pp. 359-363, 422-424, 462.

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