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Biodegradability of "eco-friendly" leather using respirometric approach / Marco Guida in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 9 (09/2019)
[article]
Titre : Biodegradability of "eco-friendly" leather using respirometric approach Type de document : texte imprimé Auteurs : Marco Guida, Auteur ; Antonella Giorgio, Auteur ; Roberta Aveta, Auteur ; Maria Scotti, Auteur ; Daniela Caracciolo, Auteur ; Giovanni Libralato, Auteur ; Francesco Aliberti, Auteur ; Salvatore De Bonis, Auteur ; Biagio Naviglio, Auteur Année de publication : 2019 Article en page(s) : p. 325-332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Biodégradation
Respirométrie
Sels métalliques
Tannage au chrome
Tannage sans sels
Wet-white (tannage)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Biodegradability is the ability of degradation of organic substances and materials into more simple inorganic substances through enzymatic activity of microorganisms. The measure of the tanning products biodegradability allows to predict the deterioration of the materials and allows to assess their impact on the environment since chromium, derived from tanning industries, could be transformed in the hexavalent stage of chromium (Cr6+) that is a suspected carcinogen. Three leather samples, have been chosen for biodegradability test, in order to evaluate differences in biodegradability and to evaluate the possibility of using alternative leathers of those based on chromium. It was possible to make a comparison between three different leather samples; among these, the highest percentage of biodegradability was found for the metal-free leather sample (84%) compared to 45% and 80% of the chrome leather and wet-white leather samples. Results highlight the possibility of using differently tanned leathers with a considerably reduced environmental impact. Note de contenu : - Materials
- Microscoic and physic-chemical analysis
- Biodegradability analysis
- Table 1 : List of chemical parameters analyzed in leather samples
- Table 2 : List of physical parameters analyzed in leather samples
- Table 3 : Results of chemical analysis of leathers
- Table 4 : Results of physical analysis of leathersEn ligne : https://drive.google.com/file/d/1xZjGx_qg9Sj3L9wShUxVz9OG-d_oNoGF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32900
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 9 (09/2019) . - p. 325-332[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21174 - Périodique Bibliothèque principale Documentaires Disponible Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure / Luo Jian-Xun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)
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Titre : Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure Type de document : texte imprimé Auteurs : Luo Jian-Xun, Auteur ; Feng Yan-Juan, Auteur Année de publication : 2019 Article en page(s) : p. 289-295 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Déchets -- Réduction
Polycarboxylates
Poudres
Produits chimiques -- Consommation -- Réduction
Tannage au chrome
Tannage sans selsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery effluents with high salinity and containing chromium have a serious environmental impact. The traditional chrome tannage that involved the use of sodium chloride, acid and chromium is one of the main origins of salt and chromium pollution. In this study, a non-pickle, chrome-reduced tanning technology was developed. The novel chrome-free agent SL can be directly employed to tan bated bovine hide producing wet-white. The shaved wet-white was pre-treated by a poly-carboxylate auxiliary agent PAA and tanned by chrome powder. It was found that the shrinkage temperature of the wet-white tanned by SL reached over 80°C, the optimal consumption of poly-carboxylate auxiliary agent was 1.5- 2wt% based on the weight of the shaved wet-white, the better chrome-reduced tanning conditions were that the wet-white was tanned with 3-4wt% chromium powder for 150-180 minutes at room temperature when the initial pH value was 3.0-3.5. The next processes were same as those of a traditional chrome tannage. Meanwhile, the shrinkage temperature of the leather tanned by the chrome-reduced tannage reached more than 95°C, the absorption of chromium was 96%, the content of Cr2O3 in the effluent was under 200mg/L. For the chrome-reduced tanned leather,the absorption of dyestuff and fat-liquor reached 99.5% and 82.5% respectively. Compared with the traditional chrome tanning process, not only was the conventional pickling process eliminated, the process was shortened and reduced the pollution of sodium chloride. The process can reduce by 50% the consumption of chrome powder, improve the absorption of chromium and reduce the content of Cr2O3 in effluent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Tanning properties of the novel chrome-free agent SL - The properties of wet-white tanned by the novel chrome-free agent SL - Optimisation of the offer of chrome tanning agent in tanning process - The properties of poly-carboxylate auxiliary agent in the low-chrome tannage - Contrast experiment between chrome-reduced tanning and traditional chrome tanning - Pilot production of leather tanned by chrome-reduced tannage
- RESULTS AND DISCUSSION : Analysis of tanning properties of the novel chrome-free agent SL and its leather - Optimum initial pH of chrome tanning agent on shaved wet-white - Optimum offer of chrome tanning agent for shaved wet-white - Optimum offer of the poly-carboxylate auxiliary agent PAA in chrome-reduced tanning of shaved wet-white - Comparison of chrome-reduced tannage and traditional chrome tanning - The properties of leather tanned by chrome-reduced tannage from pilot productionEn ligne : https://drive.google.com/file/d/1_b6GCLclh8aX2f9oJk2AMc-M7-OyAz0H/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33205
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 289-295[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21314 - Périodique Bibliothèque principale Documentaires Disponible Engineering the square cow and other things... / Graham Lampard in LEATHER INTERNATIONAL, Vol. 214, N° 4822 (07/2012)
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Titre : Engineering the square cow and other things... Type de document : texte imprimé Auteurs : Graham Lampard, Auteur Année de publication : 2012 Article en page(s) : p. 38-40 Langues : Anglais (eng) Catégories : Cuirs et peaux
Tannage sans selsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The news that the CSIR - CLRI in Chennai have developed a 'salt free tanning technology' which completely eliminates pickling and basification using conventional tanning salts and without use of any new chemicals is encourging. But, G. Lampard suggests, the need for developments has been ongoing since the days of 'a year and a day tanning'. En ligne : https://drive.google.com/file/d/1a4IhWkXMQrbloDBK41bx_WIZGg-gKv65/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15566
in LEATHER INTERNATIONAL > Vol. 214, N° 4822 (07/2012) . - p. 38-40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14041 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : A new salt-free approach to tanning Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 23 Langues : Anglais (eng) Catégories : Polycarbamoyl sulfonates
Tannage sans selsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The following paper provides an overview of a different approach to tanning.
The technique is managed in the 'non-swelling' pH zone, and thus eliminates the need for salt within the conventional acid pickle. The fibre stabilisation provided—somewhat similar to a pretannage with glutaraldehyde—allows strong leather characteristics, such as those provided by conventional chrome tannage, to be developed within a main tanning or retanning stage.En ligne : https://drive.google.com/file/d/1AydAqqHdpDC8GItMb04J5q2_oiOfKgCE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32493
in WORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006187 - Périodique Bibliothèque principale Documentaires Disponible Salt-free chromium tanning : Practical approaches / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 1 (01/2022)
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Titre : Salt-free chromium tanning : Practical approaches Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2022 Article en page(s) : p. 3-9 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Eaux usées -- Analyse
Tannage au chrome
Tannage sans selsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium tanning finds a prominant place in leather manufacturing for permanent stabilization of hide/skin matrix. Though, it has multiple advantages in terms of high thermal stability, easy process and low cost etc., the current practice is not environmentally sustainable. Poor chromium exhaustion and TDS load generation are the major environmental threats of conventional chromium tanning systems. On the other hand, salt-free chromium tanning is identified as one of the efficient alternative approaches for hide/skin matrix stabilization. However, it has not been commercially practiced due to the several practical difficulties. In this work attempts have been made to develop a practically viable high-performance salt-free chromium tanning system using deliming liquor as tanning float and changing the order of addition of masking salt. The developed methodologies completely avoid the use of salt/basification process and it is suitable for all kinds of raw materials and tannery houses. Besides, the process enjoys 71-77% reduction in TDS load and the uptake of chromium is around 90%. The physical strength characteristics are on par with conventional process and the leathers exhibit good grain tightness and roundness. The developed methodologies are simple and do not require any specialty chemicals. Note de contenu : - MATERIALS AND METHOD : Practical approaches for salt-free chromium tanning - Analysis of wet-ble leathers - Analysis of physical strength characteristics and organoleptic properties - Analysis of wastewater
- RESULTS AND DISCUSSION : Approach-1 : Salt-free chrome tanning in deliming liquor (CTDL) - Approach-2 : Changing the order of addition of masking salts (COAMS) - Microscopic analysis - Physical strength characteristics and organoleptic properties - Analysis of wastewater
- Table 1 : State-of-the-art technologies for improved chrome tanning system
- Table 2 : Process recipe for salt-free chromium tanning in deliming liquor (CTDL)
- Table 3 : Process recipe for salt-free chromium tanning: changing the orner of addition of masking salts (COAMS)
- Table 4 : Process recipe for conventional pickle-based chrome tanning
- Table 5 : Characteristics of wastewater (Deliming to Tanning)DOI : https://doi.org/10.34314/jalca.v117i1.4690 En ligne : https://drive.google.com/file/d/1aI4xzqRNBLiq2uTszet6Vj-1H1yXO16p/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37025
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 1 (01/2022) . - p. 3-9[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23238 - Périodique Bibliothèque principale Documentaires Disponible