[article]
| Titre : |
Effect of processing variable on ash content of gelable and hydrolyzed protein products isolated from treatment of chronium leather waste |
| Type de document : |
texte imprimé |
| Auteurs : |
Maryann M. Taylor, Auteur ; Edward J. Diefendorf, Auteur ; C. J. Thompson, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur |
| Année de publication : |
1993 |
| Article en page(s) : |
p. 358-367 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Enzymic processing of chronium-containing leather waste is an alternative to dumping in landfills. In prior research, we demonstrated that chrome shavings as well as chrome slits and trimmings may be hydrolyzed enzymically. In our new two step process chrome shavings were treated under alkaline conditions to obtain a high-value, high molecular weight gelable protein fraction, then the sludge that remained was treated enzymically to isolate a hydrolyzed protein fraction with 10,000-20,000 molecular weight distribution, and a recyclable chromium cake. Because there is concern that the character and quantity of the ash in the protein products would have an adverse effect on marketing of these products, we investigated the use of different proportions of alkaline agents, i.e., magnesium oxyde with varying amounts of sodium hydroxyde, sodium carbonate, potassium hydroxyde or potassium carbonate. Increasing proportions of magnesium oxide resulted in lower ash content. Further reduction in ash content was achieved by use of ion-exchange resins. Finally, since it is imperative that the chrome cake that is being recovered can be recycled, a chemical treatment was developed in which the chrome cake is dissolved in acid and the extraneous materials are eliminated by precipitation with base. |
| En ligne : |
https://drive.google.com/file/d/1qiE6ywR0qOsG7oApvA7hUrIf9EWXn5Ry/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8153 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVIII, N° 1 (10/1993) . - p. 358-367
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