Process for recovering proteins and chromium from chrome-tanning

Details Process for recovering proteins and chromium from chrome-tanning Process for recovering proteins and chromium from chrome-tanning

1983-01-27

1984-11-20

Kaplan, G. L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

8 9427, 210688, 210722, 260118, 423 53, 423544, C01G 3702, C01G 3708, C14C 332, A23J 110

Patent

active

044838298

ABSTRACT:
Waste products from the chrome-tanning of hides are washed and then chopped in water, with subsequent hydrolyzation at a pH of at least 10.5 and at boiling or near-boiling temperature. The resulting suspension is filtered to yield a polypeptide solution and a cake of solids consisting essentially of chromium hydroxide. The solution is neutralized, dehydrated, cooled and filtered to provide a virtually chromium-free proteinaceous substance usable as plant or animal feed; the solids are washed, filtered and acidified to provide chromium sulfate suitable for reutilization in tanning.

REFERENCES:
patent: 2339405 (1944-01-01), Hoeren
patent: 2413676 (1947-01-01), Behrman
patent: 2667417 (1954-01-01), Delmousee et al.
patent: 3461067 (1969-08-01), Matsumoto et al.
patent: 3950131 (1976-04-01), Young
patent: 4100154 (1978-07-01), Holloway
patent: 4393029 (1983-07-01), Heimala et al.

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