Abstract

DIAZ, Andrea; JIMENEZ, Juliana; PEREZ, M.  and  NARVAEZ, Paulo César. Proposing and evaluating applications for products obtained during chromium chip alkaline hydrolysis produced during leather tanning. Ing. Investig. [online]. 2006, vol.26, n.3, pp.50-57. ISSN 0120-5609.

Some applications for products obtained by chromium chip alkaline hydrolysis produced during leather tanning were evaluated in this work, considering the concept of maximising tanneries’ solid residue reuse for different industrial applications and minimising the environmental impact so produced. When Cr(OH)₃ is transformed into Cr₂(OH)(SO₄) it can be used in tanning leather (i.e. as tanning salt). When compared to commercial salts, it was determined that it could be applied to mixtures containing this salt, replacing it by up to 40%. Chromium content reduction was evaluated for collagen hydrolyzate by pH control after alkaline hydrolysis of the chips and by applying adsorbent materials such as bentonite, alfalfa and sorghum biomass and activated charcoal, a maximum 55% Cr removal being obtained when the first two adsorbent materials were used.

Keywords : tanning; hydrolysis; adsorption; collagen hydrolizate; chromium sulphate.

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