Chemistry: natural resins or derivatives; peptides or proteins; – Proteins – i.e. – more than 100 amino acid residues – Chemical modification or the reaction product thereof – e.g.,...
Patent
1993-02-01
1995-03-28
Russel, Jeffrey E.
Chemistry: natural resins or derivatives; peptides or proteins;
Proteins, i.e., more than 100 amino acid residues
Chemical modification or the reaction product thereof, e.g.,...
2041826, 422184, 422229, 422233, 423 55, 530343, 530356, B01F 708, C07K 112, C07K 310, C25B 700
Patent
active
054018331
ABSTRACT:
An improved method and apparatus for treating chromium containing leather scrap to recover chromium compounds and to produce a protein hydrolysate. The leather scrap is fed into an upstream mixing zone of a reaction vessel along with an alkali metal solution and the scrap and the solution are mixed by a plurality of kneading paddles carried by a rotating shaft. The mixture is then passed to a downstream hydrolyzing zone and conveyed through the hydrolyzing zone by a spiral flight. The mixture is heated by the injection of steam to thereby produce a hydrolyzed mixture comprising a protein hydrolysate containing suspended, insoluble particles of chromium compound. The hydrolysate is separated from the precipitated chromium compounds and can be recirculated to the reaction vessel while the chromium compounds can be recovered for use in the tanning process. The concentrated hydrolysate can be subjected to electrophoresis to increase the concentration of any desired amino acid in the hydrolysate.
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"Utilization of Leather Waste--Animal Feedstuff From Chrome Shavings: Part 1, Pilot Plant Study", Dos Reis et al, Journal of the Society of Leather Technologies and Chemists, vol. 75, pp. 15-19.
Erickson Paul R.
Uhren Lloyd J.
Waszgis Jeffrey M.
Russel Jeffrey E.
United States Leather Holdings, Inc.
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