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675.2 : Préparation du cuir naturel. Tannage |
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Improved chrome utilisation in chrome tanning / William C. Prentiss in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
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Titre : Improved chrome utilisation in chrome tanning Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; I. V. Prasad, Auteur Année de publication : 1982 Article en page(s) : p. 32-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Déchets -- Réduction
Masquage
Mesure
pH
Produits chimiques -- Consommation -- Réduction
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In a recent article Smith notes that emphasis on environment, health, and energy conservation has led to new studies to increase the efficiency of chromium usage in a tannery. He cites four basic concepts for increasing efficiency, these being improved uptake, recycling chrome liquors, precipitation and recovery of chrome for reuse and alkaline incineration. Utilising various techniques, all of the first three are practical commercially, while the fourth is being studied seriously from both chrome recovery and solid waste disposal perspectives. Since the first disclosure of a practical chrome tanning process in 1858 there have been literally hundreds of publications about the chemistry and technology of chrome tanning. It is estimated that about half relate to improved chrome uptake, but they can be classified into four main categories. These are control of pH, selection of masking agents, control of time and temperature, and control of float (or concentration).
pH control does not necessarily mean increasing the pH at the end of chrome tanning by adding more neutralising agent. It does include employing more modern techniques such as adding magnesium oxide, a sparingly soluble basifying agent, for control of neutralisation ; or a combination of conventional and self-basifying chrome ; or even a chelated chrome added immediately following the bate. Selection of masking agents can be very critical. The more conventional formate and acetate masking can lead to more rapid arome penetration, while the more complex, polybasic acids which affect the size of the chrome complex can decrease penetration but improve fixation. Time, temperature and control of float are all rational and interrelated. Since chrome tanning is both a physical (diffusion) and a chemical (reaction) process which ultimately leads to an equilibrium situation, any condition which achieves equilibrium more rapidly or at equilibrium increases the quantity of total fixed chrome relative to the total unfixed chrome will improve uptake. The conditions are, of course, low float, higher temperature and longer running times.
It is now possible to add a fifth category to the techniques for improved chrome uptake. Although currently there is insufficient evidence to establish the mechanism of action, it is apparent that a class of chemicals has been discovered, broadly defined as amine salts, which shifts the equilibrium of chrome between stock and float such that more chrome is exhausted in the stock and less remains in the exhaust liquor. This paper describes the results of our laboratory programme to determine the effect of process variations and define an optimum process for tannery trials. The results of confirmatory tannery trials are also reported.Note de contenu : - EXPERIMENTAL : Tanning process - Measurements
- RESULTS AND DISCUSSION : Effect of reduced chrome - Effect of chrome exhaust aid level - Effect of pickle pH - Effect of masking - Effect of stock pH after neutralisation - Addition of exhaust aid with the chrome compared with addition before the chrome - Proposed optimised processEn ligne : https://drive.google.com/file/d/1Xq6Amudrel-rlxTG9vUNEZYcPehDW-wa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34208
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Code-barres Cote Support Localisation Section Disponibilité 007129 - Périodique Bibliothèque principale Documentaires Disponible Improved chrome utilization in chrome tanning / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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Titre : Improved chrome utilization in chrome tanning Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; I. V. Prasad, Auteur Année de publication : 1981 Article en page(s) : p. 395-403 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Since the discovery of chromium as a tanning agent, there have been hundreds of publications discussing mechanisms of chrome tanning. Because of the emphasis on effluent control and the rising cost of chrome as a primary material, current work has centered on improving the efficiency of chrome tanning and on recycling (or reuse) of chrome. We have discovered a chemical which, when used in the primary chrome tanning step, apparently improves the penetration and distribution of chrome whithin the leather. This paper describes process variables and results which show that a significant reduction in chrome charged can be realized while maintaining chrome content in the leather and reducing the chrome content of exhaust liquors. Other benefits of the new process based on tannery trials are described. Note de contenu : - EXPERIMENTAL : Tanning process - Measurements
- RESULTS AND DISCUSSION : Effect of reduced chrome - Effect of pickle pH - Effect of masking - Effect of stock pH after neutralization - Effect of adding exhaust aid with chrome - Proposed optimized processEn ligne : https://drive.google.com/file/d/1p3H7PjDINZpJ-o7tOKIRrqiR1DZfLCVc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17678
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 395-403[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008514 - Périodique Archives Documentaires Exclu du prêt Improved chrome utilization in chrome tanning. II. Process variables affecting chrome exhaustion / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
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Titre : Improved chrome utilization in chrome tanning. II. Process variables affecting chrome exhaustion Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; H. A. Tetreault, Auteur Année de publication : 1982 Article en page(s) : p. 546-551 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Since the introduction last years of our process and chemical for improved chrome utilization, many more tannery and laboratory trials have been conducted to optimize the process to reduce the chrome charge and chrome content of the exhaust liquor. This paper presents the results of these trials and the influence of a range of variables from lime splitting to pH of neutralization. Note de contenu : - EXPERIMENTAL PROCEDURE : Tanning procedure - Chrome efficiency determination
- RESULTS AND DISCUSSION : Deliming - Process variables with fully delimed stockEn ligne : https://drive.google.com/file/d/1VCaN4AoV7eLUkHtNRJ8sr6ZiFRgUfPeS/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17504
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XXVII (Année 1982) . - p. 546-551[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008515 - Périodique Archives Documentaires Exclu du prêt Improved uptake of basic chromium salts in tanning operations using keratin hydrolysate / G. Ramamurthy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)
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Titre : Improved uptake of basic chromium salts in tanning operations using keratin hydrolysate Type de document : texte imprimé Auteurs : G. Ramamurthy, Auteur ; Praveen Kumar Sehgal, Auteur ; Mahendra Kumar, Auteur Année de publication : 1989 Article en page(s) : p. 168-171 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Mineral tanning practices have become increasingly more common in recent years and there is increasing concern that chromium discharged in the effluent after chrome tanning may cause ecological problems. Keratin hydrolysate (KH) prepared from keratinous material like poultry feather and tannery hair is found to tanning and rechroming operations. In chrome tanning KH was added in the tanning bath after basification and in rechroming, KH was added in the same float either before or after rechroming. Control sets without KH were run simultaneously under identical conditions. All of the experiments were done on goat skins.
Total chrome in the exhaust liquor and in the leather both before and after addition of KH was estimated for each set. Data on physical parameters of leather were also measured.
It is also seen that the use of KH helps to reduce the percentage of syntans and fillers required for retanning. Using the data obtained from laboratory tests the process was scaled up in our tannery permitting us to assess the commercial aspects of the use of KH in leather processing.En ligne : https://drive.google.com/file/d/1wqtvm0tMcKIoYkUpuraX8PHCgP4LcxQj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8856
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Code-barres Cote Support Localisation Section Disponibilité 007136 - Périodique Bibliothèque principale Documentaires Disponible Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma / Fangming Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
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Titre : Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma Type de document : texte imprimé Auteurs : Fangming Liu, Auteur ; Yuanping Jiang, Auteur ; Wenlan Xu, Auteur ; Zhengjun Li, Auteur ; Li Lixin, Auteur Année de publication : 2018 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Absorption
Cuirs et peaux
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Stabilité hydrothermale
Tannage au chrome
Technique des plasmas
Traîtements de surface
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Low temperature plasma (LTP) technology is a green, solvent-free, clean, efficient environment-friendly surface treatment technology. The pioneering works were carried out by applying LTP to surface modification of natural leather in order to improve the chrome tanning exhaustion rate. The effects of different treatment time on tanning exhaustion rate, micro-structure, chemical compositions, mechanical and organoleptic properties of leather were studied. The optimal CO2 plasma treatment time is about 10 min, at which the chrome tanning exhaustion rate increases from 78.49% to 91.82% compared with untreated leather. The SEM results show that some micro-pores, fissures, deep ravines and filamentous fibers can be observed due to the surface etching effect. From the XPS analysis, compared with the untreated leather, the O1s concentration and the O1s/C1s ratio of the 10min LTP modified leather both increase from 18.75% to 28.85% and from 0.258 to 0.479, respectively. The results show that appropriate LTP process can effectively improve the chrome tanning exhaustion rate, which reduces the emission of heavy metal chromium in waste liquor and also has a good synergistic effect on improving the comprehensive performance of leather such as hydrothermal stability, physical-mechanical and organoleptic properties. The LTP modification technology may be a new potential method for cleaner high-exhaustion chrome tanning technology. Note de contenu : - EXPERIMENTAL : Materials - LTP treatment - Chrome tanning - Characterization and performance test - Mechanical properties test - Organoleptic properties test
- RESULTS AND DISCUSSION : The effect of LTP treatment on chrome tanning absorption rate and the hydrothermal stability of wet blue - Surface morphology observation of leather - XPS analysis - The mechanism of applying LTP technology to tanning process - Mechanical property - Organoleptic propertyEn ligne : https://drive.google.com/file/d/1EM7noWdiA1YqRbHNmjib-7EZiGTBA5kg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29749
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Code-barres Cote Support Localisation Section Disponibilité 19487 - Périodique Bibliothèque principale Documentaires Disponible Improvement of the mass and energy balances in the tanning industry / Bernard Vulliermet in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
PermalinkImprovements in vegetable tanning - can acrylics be co-tanning agent / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 4 (04/2001)
PermalinkIncreased chromium tanning efficiency with collagen hydrolysates / A. Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)
PermalinkIndustrial ecology as a planning approach for a sustainable tanning industrial estate / Rita Puig in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)
PermalinkPermalinkPermalinkPermalinkPermalinkInescop is among the best in Europe / INESCOP in INDUSTRIE DU CUIR (IDC), N° 2013/04 (07-08-09/2013)
PermalinkInfluence de l'acidité sur la stabilité de la combinaison entre les dialdéhydes et le collagène / Dumitru Chisalita in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVI (Année 1974)
PermalinkInfluence de l'acidité sur la stabilité de la combinaison entre les dialdéhydes et le collagène / Dumitru Chisalita in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIV (Année 1972)
PermalinkInfluence des conditions de tannage sur la résistance à l'eau bouillante et à la transpiration des cuirs tannés au chrome à l'aldéhyde glutarique et au tannage combiné chrome-aldéhyde glutarique / Dumitru Chisalita in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIII (Année 1971)
PermalinkInfluence of microwave on chromium complex composition in tanning liquor / Jinwei Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)
PermalinkInfluence of pepsin and trypsin on chemical and physical properties of isolated gelatin from chrome shavings / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 8 (10/1997)
PermalinkInfluence of retanning and fatliquoring processes on the characteristics of goatskins / Ramón Palop in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 11 (11/2006)
PermalinkInfluence of retanning of the adsorption capacity of water on cattlehide collagen fibers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
PermalinkInfluence of selected process parameters on the reproducibility of aniline dyeings. II. The influences of retanning and dyeing processes of aniline dyeings / Rolf Streicher in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 8 (08/1992)
PermalinkInfluence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers / Pengxiang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 7 (07/2007)
PermalinkInfluence of a synthesized condensed polymer as a pre and retanning agent on the properties of buffalo leather / El-Shahat H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 2 (03-04/2003)
PermalinkInfluence of tanning on the flammability of leather / Wuyong Chen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)
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