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Auteur Bi Shi
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Sichuan University - Chengdu - China
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Thermodynamic investigations on chrome and aluminum tanning / Li Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)
[article]
Titre : Thermodynamic investigations on chrome and aluminum tanning Type de document : texte imprimé Auteurs : Li Wang, Auteur ; Wei-Mo Han, Auteur ; Yue Yu, Auteur ; Jian-Fei Zhou, Auteur ; Wen-Hua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 360-366 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
AluminiumL'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Chrome
Poudre de peaux
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
ThermodynamiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium(III) and aluminum(III) have some history of use in the leather industry, and the leathers tanned by them are greatly different in hydrothermal stability. However, the direct measure of thermodynamic characteristics of the tanning process is difficult due to the binary fibers/solution system. In this paper, the thermodynamics of chrome/aluminum tanning reaction was obtained by means of adsorption thermodynamics. The hide powder was used to investigate the adsorption behavior of both Cr(III) and Al(III), and the surface electrochemical property of hide powder was characterized by Zeta potential analyzer. The results showed that the adsorption isotherm of both Cr(III) and Al(III) could be well described by the Langmuir equation, and the quantity of Cr(III) absorbed at pH 4 is similar to that of Al(III) at pH 3.5 using the dimension of mol/g collagen fibers. Then the dimensionless equilibrium constants of such binary fibers/solution systems were obtained. The data of Gibbs free energy change (?G) indicate that the interaction between Cr(III) and collagen is slightly stronger (about 1.8 kJ·mol-1) than Al(III), which is insufficient to assume the large difference in stability of chrome-tanned and alum-tanned leathers. However, ?S of the adsorption process is positive for Cr(III) and negative for Al(III), and the addition of Cr(III) results in bigger conformational change of collagen than Al(III) indicated by both the CD spectra and SEM images, which suggest that the big differences in conformation of collagen induced by Cr(III) and Al(III) may be the foundation of difference in stability. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Experiments - Isolelectric point (pl) measurement of hide powder - Adsorption kinetics - Adsorption isotherms - Circular dichroism measurements
- RESULTS AND DISCUSSIONS : Isoelectric point (pl) of collagenf fibers - The kinetics of Cf(III) and Al(III) adsorption - The adsorption isotherm and thermodynamicsEn ligne : https://drive.google.com/file/d/1G3h9ow1E5gEz7GHM7AHWqWVtEgMWPTTR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29394
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 11 (11/2017) . - p. 360-366[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19363 - 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
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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 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)
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Titre : Two-stage temperature change chrome tanning : A more sustainable tanning process Type de document : texte imprimé Auteurs : Hui Zeng, Auteur ; Weixing Xu, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 153-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Caractérisation
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
Surfaces -- Analyse
Tannage au chrome
Température
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Under the guidance of molecular simulation of Cr(III) species in water solution, a novel chrome tanning process, the two-stage temperature change chrome tanning, was developed. In stage I, the pickled cattle hide was first tanned by a small amount of chrome tanning agent under room temperature to obtain basic hydrothermal stability. Then, in stage II, the pre-tanned wet-blue was tanned again under a high temperature (≥ 60°C) to enhance the reactivity of Cr(III) with collagen fibers. The shrinkage temperature of crusts, the absorptivity of chrome tanning agent and fatliquoring agent, the mechanical property and surface morphology of crusts were characterized to evaluate the tanning effect. The results showed that when the dosage of chrome tanning agent in two stages was 2 wt% (tanned under room temperature) and 1 wt% (tanned under 60°C), respectively, the best performances of crust were achieved. In these conditions, the shrinkage temperature of crust was 104.6°C. The comprehensive absorptivity of chrome tanning agent reached up to 96.3%. The absorptivity of fatliquoring agent in wet-blue was 90.2%. The mechanical property and grain fineness of the crust were comparable to those of conventional chrome tanned crust with 6 wt% chrome tanning agent. As a result, an efficient and more sustainable chrome tanning process with less offer of chrome tanning agent was achieved. Note de contenu : - EXPERIMENTAL : Materials and equipment - preparation of chrome tanned samples (wet-blue/crusts) - The main Cr(III) species under different temperature - Measurements and instruments
- RESULTS AND DISCUSSION : The states of Cr2(SO4)3 in water solution at penetration stage and combination stage of chrome tanning - Effect of tanning conditions on properties of wet-blue/crusts - Effect of tanning conditions on Ts of crusts - Effect of tanning conditions on comprehensive absorptivity of chrome tanning agent
- Effect of tanning conditions on Cr2O3 content of wet-blue - Effect of tanning conditions on mechanical property of crusts - Effect of tanning conditions on grain morphology of crusts - Effect of tanning conditions on the chrome distribution in experimental wet-blue - Further optimization of the temperature change chrome tanning technology - Effect of chrome tanning agent dosage in stage II on tanning effect of experimental wet-blue/crusts - Effect of the chrome tanning agent dosage in stage II on the properties of experimental crustsEn ligne : https://drive.google.com/file/d/1wQIwx4fNXcMH-sJ-KpQZiW-bbAkzYMCd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32475
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Code-barres Cote Support Localisation Section Disponibilité 20910 - Périodique Bibliothèque principale Documentaires Disponible Ultrasonic removal of organic pollutants in tannery wastewater / Bi Shi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 3 (03/2002)
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Titre : Ultrasonic removal of organic pollutants in tannery wastewater Type de document : texte imprimé Auteurs : Bi Shi, Auteur ; Xinghai Gao, Auteur ; Zhongbing Lu, Auteur ; Youjie He, Auteur ; Guoxing Li, Auteur Année de publication : 2002 Article en page(s) : p. 98-101 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of ultrasonic treatment on flocculating settling of tannery effluent, the reduction of COD in particular, was studied. The influence of the irradiation method, the duration of ultrasound and offer, and the prescription of coagulants on the efficiency of minimizing organic chemicals in wastewater were investigated. The results show that: (1) when waste water is treated only by ultrasound for 60 seconds, the removal rate of COD is 40.6%; (2) when total concentration of coagulants is increased to 100 mg/l, the greatest reduction of COD is achieved; (3) when wastewater is first treated with ultrasound for 60 seconds and then flocculated by coagulants, the reduction of COD is 10 - 37% higher than the controls without ultrasound. Thus, treatment of tannery wastewater with flocculating-settling technology can be effectively improved by ultrasound. En ligne : https://drive.google.com/file/d/13Tuy7K7WcmYAJ0GOWsnRSYeML-Vzev5G/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4314
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Code-barres Cote Support Localisation Section Disponibilité 001572 - Périodique Bibliothèque principale Documentaires Disponible Utilization of tannery solid waste : Dry strength additive for papermaking / Yaohui You in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
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Titre : Utilization of tannery solid waste : Dry strength additive for papermaking Type de document : texte imprimé Auteurs : Yaohui You, Auteur ; Yunhang Zeng, Auteur ; Yishan Liu, Auteur ; Bi Shi, Auteur ; Xuepin Liao, Auteur Année de publication : 2013 Article en page(s) : p. 250-256 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs
Ammonium
Cations
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Hydrolysats de protéines
Papier
Papier -- Propriétés mécaniques
Procédés de fabrication
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An approach of utilizing tannery solid waste was developed by using untanned solid waste as raw material to prepare a dry strength additive for papermaking. Cationic derivatives of collagen hydrolysate (C-CHs) were prepared by incorporating (2,3-epoxypropyl) trimethyl ammonium chloride into collagen hydrolysates with different molecular weights. C-CHs were employed in sheet formation for enhancing physical properties of hand-sheets, and the results indicated that C-CHs were useful in tap water and white water to improve the tensile strength and folding endurance of the hand-sheets. This should be due to the fact that C-CHs with cationic moieties are prone to be retained in anionic cellulose fibers, which is beneficial for the formation hydrogen bonds among hydroxyl groups in the cellulose fibers. Note de contenu : - EXPERIMENTAL : Materials - Preparation of CHs with different molecular weights - Cationization of CHs to obtain C-CHs - Effectiveness of C-CHs in sheet formation
- RESULTS AND DISCUSSION : characteristics of C-CHs - Effectiveness of C-CHs in sheet formationEn ligne : https://drive.google.com/file/d/11rFGXylHlX9eyLITVAEw2vFxg9Y-XQvX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19009
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Code-barres Cote Support Localisation Section Disponibilité 15337 - Périodique Bibliothèque principale Documentaires Disponible Visualization and quantification of penetration/mass transfer of acrylic resin retanning agent in leather using fluorescent tracing technique / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 11 (11/2016)
PermalinkVisualization of penetration and reaction of aldehyde tanning agent in leather using fluorescence technique / Ying Song in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)
PermalinkWaterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing / Zhang Xiuli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)
PermalinkWearable synthetic leather-based high-performance X-ray shielding materials enabled by the plant polyphenol- and hierarchical structure-facilitated dispersion / Linping Yan in COLLAGEN AND LEATHER, Vol. 5 (2023)
PermalinkWet-white based on an amphoteric polymer / Bi Shi in LEATHER INTERNATIONAL, Vol. 215, N° 4829 (04/2013)
PermalinkWet-white leather processing : a new complex combination tannage / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 3 (05-06/2011)
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