Characterization of waste materials in tanneries for better ecological uses / A. Rangel-Serrano in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 2 (02/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 2 (02/2003) . - p. 43-48 Titre : Characterization of waste materials in tanneries for better ecological uses Type de document : texte imprimé Auteurs : A. Rangel-Serrano, Auteur ; M. Maldonado V., Auteur ; K. Kösters, Auteur Année de publication : 2003 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tanning processes generate significant volumes of by-products and waste materials, among which fleshings represent the major proportion. This material can be obtained either before or after the liming treatment. The liming treatment alters the fat and protein content in the residual lleshings. The principal objective of this project is to develop a method to re-use an ample portion of these pretanned wastes. Among the already identified materials in the laboratory, we have: delimed fleshings, limed fleshings, fatty extraction residues and residual, immunized hair. It is our main concern to recover the proteins from these by-products, which constitute their majority component. Preliminary results show that during liming up to 31 percent of the soluble proteins are lost, as well as 50 percent of its fats, compared to fleshing without calcium hydroxide treatment. At the industrial scale, these differences result in variable fat recovery conditions and high volumes of low valued residual sludge. Residual hair was found to have a high protein content of 82 percent, with nitrogen content of 13 percent. Delimed fleshings have been found to contain 15 percent nitrogen. Here we would like to stress that both delimed fleshings and residual hair might well constitute an important source of protein with interesting uses as biological fertilizers in agriculture or horticulture. A series of fertilization tests have been carried out in a greenhouse. En ligne : https://drive.google.com/file/d/1aJ7X1Vu8ErRpzSEaAKGTa1JiduyrqXGf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4092 [article]

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Development of a tanning process based on using hydrolyzated material collected from leather scrap / J. Muñoz in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 83-88 Titre : Development of a tanning process based on using hydrolyzated material collected from leather scrap Type de document : texte imprimé Auteurs : J. Muñoz, Auteur ; M. Maldonado V., Auteur ; A. Rangel-Serrano, Auteur Année de publication : 2002 Article en page(s) : p. 83-88 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Wet blue leather shavings are considered a waste material and represents between 6 to 12 % of the green, salted leather total weight. In practice it is usually combined with trimmings. This scrap is considered "hazardouswaste", due to the possibility of its chrome type III content (3 to 4%) converting into chrome(VI). Therefore, they are collected and confined only in authorized pits, which imposes extra expenditures upon manufacturers. Consequently, it is not rare for such waste to be clandestinely disposed. In this work, wet blue leather scraps were treated under acidic conditions (using sulphuric acid) at temperatures above 93 °C, until soluble chromium was obtained, together with protein hydrolyzed material(HA). HA showed a 2.3 g/l of chromium oxide content, and 16.2 g/l of total nitrogen. The HA chromium oxide value was raised to 6%, and it was used as a retanning agent for split leather, beginning at a pH value of 2.5 and ending at 3.5. HA was then compared to a standard process (ST) of 6% of chromium oxide, and a 2.5 pH value. Split leather retanned with HA showed 3.2 %, of chromium oxide versus 3.7% with ST, while total nitrogen content was 11.5% with HA, being 10.0% for ST. Physical properties of split leather retanned with HA, compared to those of leather from standard process, showed a shrink temperature of up to 100 °C, and split leather texture showed better softness and aspect. A benefit of 50% was then calculated for hydrolyzate protein, with savings between 15 and 20% in chromium oxide usage, an increase of 30% in tear strength, a reduction of 10% in elongation, and 30% increase in tensile strength. From an environmental point of view, these results provide an alternative for treatment and use of wet blue leather scraps, which in turn will allow an MOXICO. increased efficiency in reusing byproducts from the leather tanning process. En ligne : https://drive.google.com/file/d/1jK3ooNeUKVx2yIe-7Nz1WQZm0gWsQgxB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4327 [article]

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