Accueil
Détail de l'auteur
Auteur V. Beleza |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Utilization of leather waste - animal feedstuff for chrome shavings : Part 1, pilot plant study / M. Alves dos Reis in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 75, N° 1 (01-02/1991)
[article]
Titre : Utilization of leather waste - animal feedstuff for chrome shavings : Part 1, pilot plant study Type de document : texte imprimé Auteurs : M. Alves dos Reis, Auteur ; V. Beleza, Auteur Année de publication : 1991 Article en page(s) : p. 15-19 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper we present experimental results on the hhydrolysis of chrome tanned shavigs.
It was observed that it is possible to remove chromium down to negligible values (less than 0.1 ppm) when hydrolysis is performed by heating the shavings at 80°C in calcium oxide liquors using the following weight proportions : 0.08 to 0.1 parts CaO, 1 part dried chrome shavings (equivalent to 21 parts wet shavings), 10 parts water. A protein concentrate containing about 80 % crude protein and 25 % essential amino acids was obtained.
An animal nutrition program to study the possible uses of this product was initiated. To obtain enough protein concentrate for this program a pilot plant has been designed and built.
Chicken feeding results have shown that the nutritional value of hydrolysed leather meal is nearly one half of thenutritional value of 44 % protein soybean oil meal and, when used in rations up to a level of 5 % has not caused any loss of appetite or visible metabolic problems to the animals.En ligne : https://drive.google.com/file/d/17Sp_Qp3QnmVeT_X_eeMrQWLmVsYqKft2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8653
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 75, N° 1 (01-02/1991) . - p. 15-19[article]Réservation
Réserver ce documentUtilization of leather waste animal feedstuff from chrome shavings : Part 1, pilot plant study / M. Alves dos Reis in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 75 (Année 1991)
[article]
Titre : Utilization of leather waste animal feedstuff from chrome shavings : Part 1, pilot plant study Type de document : texte imprimé Auteurs : M. Alves dos Reis, Auteur ; V. Beleza, Auteur Année de publication : 1991 Article en page(s) : p. 15-19 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper we present experimental results on the hydrolysis of chrome tanned shavings.
It was observed that it is possible to remove chromium down to negligible values (less than 0.1 ppm) when hydrolysis is performed by heating the shavings at 80°C in calcium oxide liquors using the following weight proportions : 0.08 to 0.1 parts CaO, 1 part dried chrome shavings (equivalent to 2 parts wet shavings), 10 parts water. A protein concentrate containing about 80 % crude protein and 25 % essential amino acids was obtained.
An animal nutrition program to study the possible uses of this product was initiated. To obtain enough protein concentrate for this program a pilot plant has been designed and built.
Chicken feeding results have shown that the nutritional value of hydrolysed leather meal is nearly one half of the nutritional value of 44 % protein soybean oil meal and, when used in rations up to a level of 5 % has not caused any loss of appetite or visible metabolic problems to the animals.En ligne : https://drive.google.com/file/d/17Sp_Qp3QnmVeT_X_eeMrQWLmVsYqKft2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8671
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 75 (Année 1991) . - p. 15-19[article]Réservation
Réserver ce documentUtilization of leather waste animal feedstuff from chrome shavings : Part 2, a model for the hydrolysis kinetics / M. Alves dos Reis in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 75 (Année 1991)
[article]
Titre : Utilization of leather waste animal feedstuff from chrome shavings : Part 2, a model for the hydrolysis kinetics Type de document : texte imprimé Auteurs : M. Alves dos Reis, Auteur ; V. Beleza, Auteur Année de publication : 1991 Article en page(s) : p. 45-47 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper a model is presented to describe the kinetics of the hydrolysis of blue shavings by hot calcium hydroxide solutions.
We conclude that above 40°C the reaction velocity is controlled by chemical reaction, the diffusion of OH- inside the shavings being a fast process. Temperatures below this limit are of no technical interest and were not investigated.
In the proposed model the conversion of splits into soluble proteins (fraction of hydrolysed shavings) is expressed as a 3rd degree polynomial, where the independent variable is time and the coefficients are functions of temperature.En ligne : https://drive.google.com/file/d/15XEvK0qRNqNA4IO2AD9j7XFl9rm-UbUx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8674
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 75 (Année 1991) . - p. 45-47[article]Réservation
Réserver ce document