Minimization of industrial wastes-adding value to collagenic : Adding value to collagenic materials procter memorial lecture / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 3 (05-06/2003) . - p. 91-97 Titre : Minimization of industrial wastes-adding value to collagenic : Adding value to collagenic materials procter memorial lecture Type de document : texte imprimé Auteurs : J. Cot, Auteur ; Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; Pedro J. Celma, Auteur ; Rigoberto Choque, Auteur ; Luisa F. Cabeza, Auteur ; L. Labastida, Auteur ; J. Lopez, Auteur ; J. Salmeron, Auteur Année de publication : 2003 Article en page(s) : p. 91-97 Langues : Anglais (eng) Catégories : Agents de tannage Chrome trivalent Colorants Cuirs et peaux -- Déchets Déchets -- Réduction Huiles et graisses Polyacryliques Polyuréthanes Statistiques Tannage -- Déchets Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Our research is in the area of minimisation of industrial waste in the leather industry. This contribution is concerned with the processing of chromed collagen residues produced at each of the different stages of production. These are : - group I : chromed residuals - tanning and drying stage - crust state - group II : chromed residuals + fatty matter - fatliquoring stage - group III : chromed residuals + fatty matter + retanning agents - retanning stage - group IV : chromed residuals + fatty matter + retanning agents + dyestuff - dyeing stage - group V : chromed residuals + fatty matter + retanning agents + dyestuff + acrylic and /or polyurethanes - finish stage Group V residues represent the highest percentage of the total volume of residues and they are also the most complex. The group includes the trimmings from industrial manufacturers of leather products such as footwear, clothing and upholstery. Chromed collagen residues are those stabilised or crosslinked with chromium (III) salts which block any later treatment to obtain gelatine using conventional methods. A large part of this type of residue is used for the production of agglomerates known as regenerated leather, mixing with latex in dutch-piles, from which various articles are manufactured. Note de contenu : - STASTISTICAL TREATMENT OF THE RESULTS : Experimental design - EVOP design - The relationship between NaOH concentration, temperature and Bloom degree - Inclusion of the effect of temperature and of time on the Bloom degree - INDUSTRIAL APPLICATION - Table A : Variable levels of the box and hunter design - Table B : Experimental plan randomly ordered - Table C : First EVOP cycle design to explore the optimum Bloom zone : H2O2 remained constant at 1 mL - Table D : Second EVOP cycle design to explore the optimum Bloom zone : H2O2 remained constant at 1 mL - Table E : Experiments used to explore the functional relationship between the NaOH concentration and Bloom degree En ligne : https://drive.google.com/file/d/1ZN4xdrByWrdVJUfF_R7kUw77M4hKfcNs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39781 [article]

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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]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 115-128 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 perpectives En ligne : https://drive.google.com/file/d/1mf5XWt0cvDqFdzZhQVdLcmbnTosrgp3h/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4455 [article]

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