Liquid purification or separation – Processes – Chemical treatment
Reexamination Certificate
2006-07-18
2006-07-18
Witz, Jean C. (Department: 1651)
Liquid purification or separation
Processes
Chemical treatment
Reexamination Certificate
active
07077966
ABSTRACT:
The present invention refers to a continuous process for gelatines production and chromium recovery from tanned hides and skins shaving, containing trivalent chromium. The claimed process consists in an acid hydrolysis followed by separations of the various products, wherefrom three major components are obtained: gelatine from collagen, tanning chromium salt, used for hides and skins tanning, and the hydrolysing agent. The gelatines obtained can be used as adhesives in various industrial sectors, i.e. from the industry of abrasives to the paper and cardboard industry, to bookbinding, to the industry of dyes and plasters, to the production of matches. The chromium salts obtained can be recovered and reused in the tanning industry; the hydrolysing agent may be recycled.
REFERENCES:
patent: 1340721 (1920-05-01), Lamb
patent: 2286038 (1942-06-01), Pierson
patent: 21 36 769 (1973-02-01), None
patent: WO 93/14170 (1993-07-01), None
patent: WO 93/17970 (1993-09-01), None
Artoni S.A.S. Di Artoni Giancarlo & Co.
Stetina Brunda Garred & Brucker
Witz Jean C.
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