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Processing of collagenic residues. Isolation of gelatin by the action of peroxochromates / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)
[article]
Titre : Processing of collagenic residues. Isolation of gelatin by the action of peroxochromates Type de document : texte imprimé Auteurs : Jaime Cot, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur ; Maria Fort, Auteur ; Pedro J. Celma, Auteur ; Robert Carrio, Auteur ; Rigoberto Choque, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 1999 Article en page(s) : p. 115-128 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The experience of our research group with topics related to the dechroming(III) to chromium(VI) by peroxides in alkaline conditions, allowed us to know in-depth the reaction mechanisms. The formation in situ of some peroxochromates (containing up to 2,5 groups peroxo for each atom of chromium), unstable and with a great owidizing potential, is fundamental in the process of gelatin isolation. It has been demonstrated that the chromium-containing collagenic wastes that had bee previously dechromed by this method produce a gelatin with better yield, quality and in a much shorter treatment, compared with conventional methods described in the literaure. The residual chrome content in the gelatin can be eliminated using tangencial ultrafiltration and the reverse osmosis techniques. Furthermore, the chromium (VI) is recovered by ion-exchange resins and can be re-used in tanneries. Finally, physico-chemical characteristics of the isolated gelatins were evaluated. Note de contenu : - EXPERIMENTAL : First experimental design - Second experimental design - Activity of the peroxochromates generated in situ
- RESULTS AND DISCUSSION : Applications of the isolated gelatin - Future perpectivesEn ligne : https://drive.google.com/file/d/1mf5XWt0cvDqFdzZhQVdLcmbnTosrgp3h/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4455
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 115-128[article]Réservation
Réserver ce documentTreatment of sheepskin chrome shavings. Isolation of high value protein products and reuse of chromium in the tanning process / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 7 (09/1999)
[article]
Titre : Treatment of sheepskin chrome shavings. Isolation of high value protein products and reuse of chromium in the tanning process Type de document : texte imprimé Auteurs : Luisa F. Cabeza, Auteur ; Albert M. Manich, Auteur ; Jaime Cot, Auteur ; Pedro J. Celma, Auteur ; Esther Grau, Auteur ; Robert Carrio, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur ; Maryann M. Taylor, Auteur Année de publication : 1999 Article en page(s) : p. 268-287 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : During the last few years we have demonstrated that cattle hide chrome shavings, a waste coming from the leather industry, can be treated to isolate protein products and chrome sulfate. In Spain and in many other countries, the production of sheepskins is as important as the production of cattle hides. In this paper, the conversion of sheepskin chrome shavings to gelatin, hydrolysate and chrome sulfate is presented as are the chemical and physical properties of these products. The suitability of recovered chrome sulfate as a tanning agent was demonstrated by the tannage of pickled sheepskins, using matched sides comparisons; results are given for runs employing various properties of of recycled to commercial chromium. Chemical analyses in the wet blue stage and three different physical tests in the crust stage were performed on all the leather samples to evaluate the tannage. The results show that there were no significant differences in the leather that had been tanned with either the commercial chromium or the recycled chromium. En ligne : https://drive.google.com/file/d/1AFaZ3M0QgalKmEPzNDvwWzMUIE1AMOze/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4451
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 7 (09/1999) . - p. 268-287[article]Réservation
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