[article]
| Titre : |
Kinetics of alkaline hydrolysis of the insoluble protein fraction following enzymatic hydrolysis of chrome-tanned shavings |
| Type de document : |
texte imprimé |
| Auteurs : |
J. Hrncirik, Auteur ; Karel Kolomaznik, Auteur ; J. Kupec, Auteur ; F. Hruska, Auteur ; M. Dvorackova, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 1-7 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The problem of using chrome-tanned wastes (namely shavings) has been the subject of a number of reports. One path is enzymatic hydrolysis with possible utilization of both the protein fraction as well as chromium. After hydrolysis and subsequent filtration, a so-called filter (or chrome) cake is formed, which is composed of hydrated Cr2O3 heavily contaminated with protein products of hydrolysis (removable, e.g. in washing) as well as with a non-hydrolysable fraction. The fraction requires breaking down, e.g. with strong alkali, as was performed in tests conducted to provide data for evaluating hydrolysis kinetics. Applying a number of simplifying assumptions, efforts were directed to expressing formal kinetics of this alkaline hydrolysis with a KOH solution. According to calculations, the reaction appears to agree well with a second-order reaction, with effective values of rate constant c = 3.9.10-3 l/(mol.s) and activation energy Ea = 130 kJ/mol at hydrolysis temperature of 116°C. |
| En ligne : |
https://drive.google.com/file/d/1oU3ce67tRFLR-MZNtxcMLIOJrrgMn2wP/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4084 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 1 (01/2005) . - p. 1-7
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