Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1974-11-26
1979-08-21
Levy, Donald
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 94A, 8173, 8174, 8175, D06P 500
Patent
active
041652177
ABSTRACT:
A method for treating a wash waste liquor, which comprises treating fibers which have been dyed by applying a dye liquor containing a solution or dispersion of a non-ionic dye in a high boiling water-soluble organic medium or a mixture of it with a low boiling medium and then heating the fibers, with a low boiling organic solvent capable of dissolving the high boiling water-soluble organic medium, thereby to wash out the unfixed dye and the high boiling water-soluble organic medium remaining on the surface of the fibers; concentrating the wash waste liquor by evaporating at least a part of the low boiling organic solvent contained in the waste liquor; and extracting the high boiling organic medium from the concentrate using water.
REFERENCES:
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patent: 1791990 (1931-02-01), Whitehead
patent: 2235234 (1941-03-01), Moncrief
patent: 2445323 (1948-07-01), Galatioto
patent: 3523749 (1970-08-01), MacLeod
patent: 3667898 (1972-06-01), Bergman
patent: 3809536 (1974-05-01), Silverpiper
Milicevic, J. Amer. Assoc. of Tex. Chem. and Col., vol. 2, No. 5, 1970, pp. 87-90, 95-98.
Azumi Toshinori
Kitamura Kazuo
Shibata Fumio
Takabayashi Fumiki
Watabe Kaname
Levy Donald
Teijin Limited
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