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Recycling lipids extracted from skins in fatliquor formulations / Olga Uhlemann in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 10 (10/1992)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 10 (10/1992) . - p. 371-379 Titre : Recycling lipids extracted from skins in fatliquor formulations Type de document : texte imprimé Auteurs : Olga Uhlemann, Auteur Année de publication : 1992 Article en page(s) : p. 371-379 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new degreasing process has been studied in our laboratory and scaled up for industrial manufacture. This clean process leads to a complete recovery of fats which can be recycled in fatliquors formulations. Several steps were required to produce emulsionable fatliquor formulations. First, the extracted fats have been analyzed and characterized qualitatively as well as quantitatively. In order to avoid the problems associated with the chemical production of emulsionable fats, we have opted for a physical process: the emulsification through addition of appropriate surfactants. The selection of surfactants has been based upon the concept of emulsion stability. Several formulations have been tested at laboratory scale for various kinds of leather (vegetable or mineral tannins). Industrial trials have shown that the process can be scaled up to more important quantities of skins and that it is industrially feasible. En ligne : https://drive.google.com/file/d/19C8I8BASi_dqeXWA66r8qLKjZnrP0vji/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8270 [article]

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Characterization of products isolated by enzyme treatment of chromium-containing leather waste / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 10 (10/1992)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 10 (10/1992) . - p. 380-388 Titre : Characterization of products isolated by enzyme treatment of chromium-containing leather waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Edward J. Diefendorf, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 1992 Article en page(s) : p. 380-388 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Enzymic processing of chrome shavings and trimmings has previously been shown to be a viable treatment of this substantial waste product generated by the tanning industry.Characterization of the chrome cakes ant the protein generated by these treatments was an important next step in this research.Tanneries use different type of processes to tan the leather and these varying processes are dependent on the type of chrome should be present in the effluent.Chrome shavings were obtained from three tanneries.The blue stock had been processed by conventional, albeit different, tannages.For optimal solubility, an individual pretreatment was developed for each type of shavings.They were then treated enzymically and the chrome cake and the protein fraction were isolated.Analyses of the shavings,the chromium-containing cakes and the protein fraction showed that chromium containing leather waste from a variety of sources can be enzymically digested when the appropriate pretreatment is performed.The chemical composition of the isolated products is dependent on the type of treatment and on the composition of the original chromium-containing leather waste product. En ligne : https://drive.google.com/file/d/10VQ5_h8DSqgvmHLdCL5fTyHAm3Cde5px/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8283 [article]

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006898	-	Périodique	Bibliothèque principale	Documentaires	Disponible