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The XVth procter memorial lecture fact or fiction ? How much do we really know about the chemistry of chromium today ? / H. M. N. H. Irving in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)
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Titre : The XVth procter memorial lecture fact or fiction ? How much do we really know about the chemistry of chromium today ? Type de document : texte imprimé Auteurs : H. M. N. H. Irving, Auteur Année de publication : 1974 Article en page(s) : p. 51-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage En ligne : https://drive.google.com/file/d/1XU5fR0FEqWkn_ygzm87ybpeM10ywSQO1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20430
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 51-62[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008594 - Périodique Archives Documentaires Exclu du prêt Theory and mechanism of tanning present thinking and future implications for industry / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 1 (01-02/2001)
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Titre : Theory and mechanism of tanning present thinking and future implications for industry Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur Année de publication : 2001 Article en page(s) : p. 24-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Entropie (thermodynamique)
Hydrogène
Hydroxyproline
Tannage au chrome
Tannage organique
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The range and nature of reactions that contribute to the stability of collagen are discussed in terms of the definition of tanning. Previous ideas of the origin of hydrothermal stability of modified collagen are included in the discussion. A new theory of the origin of hydrothermal stability is defined, based upon the relative contributions of entropic and enthalpic changes to collagen by interactive chemical processes. These changes culminate in stabilisation by the formation of matrices, that are capable of producing high hydrothermal stability. Ts> 100°C. The theory explains the whole range of observed effects in mineral (inorganic) and organic tanning reactions, thereby creating an inclusive, unifying model of collagen stabilisation. Furthermore, it allows not only prediction of the effects of any new tanning processes, mineral or organic, together with modifications to current processes, but also specifies where new chemistries might be sought, to achieve high hydrothermal stability. Note de contenu : - The definition of tanning
- The shrinking transition
- The roles of hydroxyproline and hydrogen
- Entropic effect
- The thermodynamics of tanning and shrinking
- The shrinking reaction
- Organic tanning
- Chromium(III) tanning
- Completing the theory of tanning
- Future developments
- Table 1 : The rise in shrinkage temperature caused by traditional tannages
- Table 2 : Typical shrinkage temperatures for leathers tanned with modern chemistries
- Table 3 : The dependence of shrinkage temperature on imino acid content of collagens
- Table 4 : The effect of polypeptide structure on the unfolding transition temperature
- Table 5 : The effects of sodium salts on collagen
- Table 6 : The effect of fluoride ion on collagen stabilisation
- Table 7 : Activation parameters at 333 K for different tannages (adapted from ref. 26)
- Table 8 : The relationship between shrinkage temperature and the parameters of the shrinking reaction
- Table 9 : The size of the cooperating unit in unmodified and modified collagen
- Table 10 : The maximum effect of excess carboxylate on the shrinkage temperature of leather tanned with 40 % basic chromium(lhl) perchhorate
- Table 11 : Apparent shrinkage temperature of hide powder equilibrated with alcohol
En ligne : https://drive.google.com/file/d/1VSARpzkIMKqpj_JryvcFwaZ5TJft8nZ5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40591
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 1 (01-02/2001) . - p. 24-34[article]Thermodynamics of leather dyeing : III. The preparation of chrome-tanned hide powders and their interaction with C.I. Acid Orange 7 / A. T. Atto in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 55, N° 3 (03/1971)
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Titre : Thermodynamics of leather dyeing : III. The preparation of chrome-tanned hide powders and their interaction with C.I. Acid Orange 7 Type de document : texte imprimé Auteurs : A. T. Atto, Auteur ; H. E. Nursten, Auteur Année de publication : 1971 Article en page(s) : p. 84-103 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants acides
Cuirs et peaux -- Teinture
Entropie (thermodynamique)
Orange (couleur)
Poudre de peaux
Tannage au chrome
ThermodynamiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A procedure has been developed for chrome-tanning hide powder and it has been used to prepare a range of chrome-tanned hide powders with increasing chrome contents. The interaction of these tanned hide powders with the pure dye acid of C.I. Acid Orange 7 has been studied thermo-dynamically. The saturation capacity of the tanned hide powder for the acid dye increases almost linearly with the amount of chromium present, a chrome oxide content of about 3 % leading to a saturation capacity about twice that of untanned hide powder. The saturation capacities can be sur¬prisingly large, rising to almost three molecules dye bound per chromium atom. Chrome-tanned hide powder has been found to have a lower affinity for the acid dye than untanned, which is connected with the much larger satura¬tion capacity and the consequently lower activity in the fibre produced by a given amount of dye on the hide powder. The affinity at 60°c is independent of minor differences in tannage, but decreases with increasing amounts of chromium. The affinity increases with temperature in the range 25-75°c, while the saturation capacity decreases. Ageing chrome-tanned hide powder does not affect the affinity, but decreases somewhat the saturation capacity. Dyeing chrome-tanned hide powder appears to be exothermic and the entropies of dyeing are positive, the process thus being thermodynamically similar to dyeing untanned hide powder. Note de contenu : - Preparation of a number of batches of chrome-tanned hide powder (A) C20 hide powder
- (B) ATA hide powder, Batch 1
- (C) ATA Hide powder, Batch 2
- (D) ATA hide powder (relatively very low chrome content) batch 3a
- (E) ATA hide powder (relatively High chrome content), Batch 3b
- Analysis of the tanned hide powders
- Purification and analysis of the dye used
- Dyeing
- Reversibility of dyeing
- Table 1 : Analysis of the tanned hide powders
- Table 2 : Experimental data and quantities calculated therefrom
- Table 3 : Saturation capacities of some chrome-tanned hide powders for C.I. Acid Orange 7
- Table 4 : Affinity of C.I. Acid Orange 7 for some chrome-tanned hide powders
- Table 5 : Variation of affinity of C.I. Acid Orange 7 for chrome-tanned hide powder with chrome content
- Table 6 : Comparison of the activity of C.I. Acid Orange 7 in tanned and untanned hide powder
- Table 7 : Heats and entropies of dyeing of some chrome-tanned hide powders with C.I. Acid Orange 7Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35668
in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 55, N° 3 (03/1971) . - p. 84-103[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007091 - Périodique Bibliothèque principale Documentaires Disponible Thermodynamics of leather dyeing / A. T. Atto in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 55, N° 5 (05/1971)
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Titre : Thermodynamics of leather dyeing : IV. Dyeing of chrome-tanned hide powder with simple acid dyes Type de document : texte imprimé Auteurs : A. T. Atto, Auteur ; H. E. Nursten, Auteur Année de publication : 1971 Article en page(s) : p. 163-174 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants acides
Cuirs et peaux -- Teinture
Entropie (thermodynamique)
Poudre de peaux
Tannage au chrome
Titrage thermométriqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The previous study of the interaction between chrome-tanned hide powder and C.I. Acid Orange 7 has been extended to seven other simple acid dyes in the form of their specially purified dye acids. Good reciprocal plots were obtained at 45 and 60°c, leading to saturation capacities greater than 2 meq/g dry hide substance, except for the dye acids bearing sulphonic groups peri to the azo link. The affinities obtained are lower than those for untanned hide powder and this must be viewed as a consequence of the much greater saturation capacity, which leads to the production of a lower activity in the fibre by a given amount of dye. The affinity of a dye acid for chrome-tanned hide powder increases with the insertion of a methyl group or a fused-on benzene ring, but movement of a sulphonic group to a position peri to the azo link reduces it. Overall, the standard heats and entropies of dyeing chrome-tanned hide powder are of the same sign and order of magnitude as those for the untanned substrate. The thermodynamics of dyeing chrome-tanned hide powder thus do not appear to differ fundamentally from those of dyeing untanned hide powder. Note de contenu : - EXPERIMENTAL : The dyes - Substrates - Dyeing
- RESULTS AND DISCUSSION : The reciprocal plot - Titration curves - Saturation capacities - Affinities - Heats of dyeing - Entropies of dyeing
- Table 1 : Experimental data and quantities calculated therefrom
- Table 2 : Saturation capacities, affinities and ratio dye acid/Cr atom of chrome-tanned ATA 1114e powder for a range of simple dye acids
- Table 3 : Affinities of some simple dye acids for untanned and tanned hide powder kcal/mole
- Table 4 : Heats and entropies of dyeing chrome-tanned hide powder with some simple dye acids at 45-60 °CPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35667
in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 55, N° 5 (05/1971) . - p. 163-174[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007093 - Périodique Bibliothèque principale Documentaires Disponible Transposition of chrome tanning in leather making / Chao Wu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 6 (06/2014)
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Titre : Transposition of chrome tanning in leather making Type de document : texte imprimé Auteurs : Chao Wu, Auteur ; Wenhua Zhang, Auteur ; Xuepin Liao, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 176-183 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Cuirs et peaux -- Propriétés mécaniques
Eau -- Consommation -- Réduction
Eaux usées -- Analyse
Morphologie (matériaux)
Oxydes de chrome
Post-tannage
Procédés de fabrication
Récupération (Déchets, etc.)
Stabilité hydrothermale
Tannage au chrome
Tannage organique
Wet-white (tannage)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To avoid the release of chrome from leather into post tanning effluents and the generation of chrome shavings, an inverse chrome tanning technology based on wet white was investigated. Conventional bated pelt was firstly tanned using an amphoteric organic tanning agent (Tingjiang white tanning agent, TWT) without pickling. Then, the TWT tanned wet white was directly processed with conventional post tanning processes. Chrome tanning was transposed to the end of the post tanning. The wet white had a shrinkage temperature (Ts) around 85°C that met the needs of shaving operation, and did not generate chrome shavings. The Ts and Cr2O3 content of the leather, by using this inverse chrome tanning technology, were higher than those of the conventional chrome tanned leather. With this inverse technology, the chrome output was reduced by 48%, mainly because no chrome was released from leather in post tanning processes. Meanwhile, the volume of chromium-containing wastewater discharged from the inverse processes was barely 31% of that from the conventional processes, which makes it much easier to collect and recover chromium from the effluents. Additionally, the tensile strength, tear strength and general appearances of the leather produced by the inverse technology were comparable to those of the conventional chrome tanned leather. Note de contenu : - EXPERIMENTAL : Materials - Leather making processes - Analyses of leather properties (Hydrothermal stability - Distribution of chrome in leather - Morphology of leather - Physical properties) - Analyses of effluents (Total organic carbon concentration (TOC) - Concentration of chrome in effluents
- RESULTS AND DISCUSSION : pH change in leather making processes - Content and distribution of Cr2O3 in leather - Discharge of chrome from leather making processes - Absorption capacity of leathers of retanning and fatliquoring chemicals - Morphology in leathers -Physical properties of leathersEn ligne : https://drive.google.com/file/d/1uviZiCwz4VgYvS-NNEWcomxG72XyP5nM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21515
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 6 (06/2014) . - p. 176-183[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16325 - Périodique Bibliothèque principale Documentaires Disponible 16406 - Périodique Bibliothèque principale Documentaires Disponible Two stage chrome tanning system (basification in a separate float) influence of organic SO2 reduced chrome tan / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
PermalinkTwo-stage temperature change chrome tanning : A more sustainable tanning process / Hui Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 5 (05/2019)
PermalinkUse of long-chain synthetic phenolic antioxidants to produce chromium-tanned leather without risk of hexavalent chromium formation / Irene Compte in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)
PermalinkUse of silk hydrolysate in chrome tanning / G. Itirli Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)
PermalinkUtilisation of phenolsulphonic acid to hydrolyse chrome shavings in preparation of composite condensates for leather retanning / Junqing Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
PermalinkUtilization of chromium-tanned leather solid wastes in microencapsulation / Bugra Ocak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)
PermalinkA very rapid liming and tanning process / E. Heidemann in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
PermalinkWater insoluble compounds for chrome tannage basification in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkWaterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 2 (02/2015)
PermalinkPermalinkX. Kongress der internationalen union der gerberei-chemiker-verbände Luzern (Schweiz), 1..-15 september 1967 / International Union of Leather Chemists Societies / IULCS (1967)
PermalinkYield of chrome tanned side leather / Samir Das Gupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
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