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Mention de date : 11/1994
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Comparison of efficiencies and costs of chromium recovery methods / Hikmet Toprak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
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Titre : Comparison of efficiencies and costs of chromium recovery methods Type de document : texte imprimé Auteurs : Hikmet Toprak, Auteur Année de publication : 1994 Article en page(s) : p. 339-351 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Conventional physical-chemical treatment of tanning effluent consists of pre-treatment and dosing with coagulants and flocculants, followed by sedimentation and sludge handling and disposal. It is economically feasible to recover spent chromium in the sludge to reuse in the tanning process. Chromium can be recovered from wastewater treatment sludges by incineration at 600°C for 5 hr or by acid leaching. The chromium containing sludge is incinerated in a high-rate reator and the chromium is the ash, as CrO4-2, is leached with HNO3. Then, the resulting solution is filtered and reduced adding H2SO4 and sugar. Some acids, such as citric, oxalic, acetic, nitric and sulfuric, are effective chelating agents for the recovery of trivalent chromium from the sludge. The extracted Cr+3 solutions have tanning properties. In this study, chromium was recovered from sludges of "gökdere tannery wastewater treatment plant" using both methods and the recovery efficiencies and costs were compared. En ligne : https://drive.google.com/file/d/1zz4ssnc-R5RViJ6i8oT_QQBcJWcbYcAJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8034
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 11 (11/1994) . - p. 339-351[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006924 - Périodique Bibliothèque principale Documentaires Disponible A new enzyme process for improved yield and softer leather technical note / Mihai Deselnicu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
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Titre : A new enzyme process for improved yield and softer leather technical note Type de document : texte imprimé Auteurs : Mihai Deselnicu, Auteur ; Victoria Bratulesco, Auteur ; Marcel Siegler, Auteur ; Andrei Anghel, Auteur Année de publication : 1994 Article en page(s) : p. 352-356 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main purpose of bating is to remove the noncollagenous proteins to make the leather softer with greater stretch. Failure to remove the noncollagenous proteins causes a cementing together of the fibres when the leather is dried and results in firmness and lack of flexibility. It is weel known that the classical bating process in the alkaline condition makes use of proteolytic enzymes, which are of pancreatic or baterial origin, and the efficient/activity of the process depends on the enzyme concentration as well as temperature, pH, and time during the bating process. Therefore, the enzyme treatment in alkaline conditions is considered a very sensitive process.
A new development in this field is the use of the enzyme, pepsin, which is extracted from bovine or porcine stomach mucous and is active in acid condition.Treatment with this enzyme under acid conditions may be done after the pickle process or after the chrome tanning.The treatment is safer and has a more selective action than the classical bating under alkaline conditions.By treating the shaved wet blue hides with the acidic enzyme not only are the advantages of improved yield and softer leather achieved, but uniformity of quality and physical properties are also achieved.En ligne : https://drive.google.com/file/d/1whd94jRnEAhyTxxUplbz94PRs0GkrAMv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8041
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 11 (11/1994) . - p. 352-356[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006924 - Périodique Bibliothèque principale Documentaires Disponible Investigations into properties and use of reindeer skin and leather and influence of defects on leather properties / Taina Korpiharju in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
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Titre : Investigations into properties and use of reindeer skin and leather and influence of defects on leather properties Type de document : texte imprimé Auteurs : Taina Korpiharju, Auteur Année de publication : 1994 Article en page(s) : p. 357-363 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The conservation of reindeer skins is a very important process in determining the properties of the resultant leather. Commonly the skins are salted where the reindeer are slaughtered, but,because of the cold climate in artic and subartic zones, the partially frozen skins do not obtain a uniform cure. The frozen areas which are not adequately cured are thus prone to microorganisms, with the result that local skin defects are often generated. These defects can be seen in the skin as translucent patches,especially after the dehairing process in leather production. These defects also have some influence on the properties and use of skin and leather.
This study sets out to investigate the properties of the skin and leather of the semi-domestic reindeer(Rangifer tarandus tarandus). Inherent conditions such as breed, climate, diet, sex and age greatly influence the quality of reindeer skin, as do many kinds of skin defencts.Parasitic infestations in reindeer often cause the leather industry heavy losses.En ligne : https://drive.google.com/file/d/1Rf471yEMoPvtqIpQ5XhGiEYbh1oXFOti/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8042
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 11 (11/1994) . - p. 357-363[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006924 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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006924 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |