Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1992-03-10
1993-12-21
Brunsman, David
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
210632, 210913, 8 9427, 435265, 435 681, C01G 3700, C12P 2106, C12J 700
Patent
active
052719120
ABSTRACT:
Chromium containing protein materials are treated by processes which include the steps of: combining the material to be treated with sufficient water to effect the solubilization of the gelable protein recovered therefrom, and an alkali additive. The mixture is thereafter held at a temperature of from about 60.degree. C. to about 85.degree. C. for a period of time of from about 0.5 hour to about 8 hours. The mixture is then filtered to remove the aqueous phase, which contains solubilized gelable protein. Subsequently, water is again added to the resultant chrome-containing proteinaceous cake and at least one enzyme is utilized to hydrolyze the remaining protein thus producing a product containing solubilized partially hydrolyzed protein and insoluble chromium. After separation, the chrome in the insoluble residue may be recycled into the pickling or tanning process, and the essentially chrome-free protein components may be used as ingredients in feeds, fertilizers, and cosmetics. The processes of the present invention are used to particular advantage to treat wastes from the leather tanning industry including blue stock, chrome shavings, chrome buffing dust, chrome cakes and chrome sludges.
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Chemical Abstracts vol. 115, No. 13 115:129420j (1991).
Taylor et al. "Enzymatic Treatment of Chrome Shoija" Journal of the American Leather Chemists association (Aug. 1990) pp. 264-275.
Taylor, Maryann, et al., "Enzymatic Treatment of Solid Waste Generated in the Tanning Industry," Abstracts of IVLTCS, 20th Congress, (Oct. 15-19, 1989).
Taylor, Maryann M., et al., "Enzymatic Treatment of Chrome Shavings," JALCA, vol. 84, p. 157, (May 1989).
Heidemann, E., "Disposal and Recycling of Chrome-Tanned Materials," JALCA, vol. 86, pp. 331-332, (1991).
Brown Eleanor M.
Diefendorf Edward J.
Marmer Willian N.
Taylor Maryann M.
Brunsman David
Fado John D.
Lipovsky Joseph A.
Silverstein M. Howard
The United States of America as represented by the Secretary of
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