Alternative process for recovery of chrome(III)-effluents / Jaime Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 4 (07-08/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 4 (07-08/2008) . - p. 139-149 Titre : Alternative process for recovery of chrome(III)-effluents Type de document : texte imprimé Auteurs : Jaime Cot, Auteur ; Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; Pedro J. Celma, Auteur ; F. Fernandez, Auteur ; J. Cot-Gores, Auteur Année de publication : 2008 Article en page(s) : p. 139-149 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfite de sodium Eaux usées -- Epuration Eaux usées -- Teneur en chrome Fluidisation Glucose Gommes et résines Oxydoréduction Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Récupération (Déchets, etc.) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This scheme aims to set up an alternative process to recover chrome(III) from tannery effluents. The use of the conventional technique of alkaline precipitation (magnesium oxide) of chromium(III) is well known from the literature and is in daily practice in tanneries worldwide. This technique may in fact represent the cheapest treatment nowadays; however, the latest economic studies have revealed the influence of parameters that could significantly alter investment costs and thus open a door to alternative processes. The main problems that the precipitation technique carries with it are : - a) the presence of highly masked chrome(III) complexes, difficult to precipitate even in alkaline medium. - b) the speed of precipitation and the density of the precipitate can be a major problem. Sometimes, the application of heat is required. - c) filtration of the precipitate and subsequent drying to remove possibly 30% of the water content of the chromecake (various techniques are used). - d) recovered chrome(III) obtained by re-dissolving the cake with sulphuric acid and final adjustment to 33°Sch basicity can occlude large amounts of highly masked chrome (III) complexes which, in turn, produce uneven dyed grain surfaces ; limiting dyeing to dark shades. Furthermore, basic factors such as energy consumption, the lengthy nature of the overall process, the simple but numerous stages, and limited coverage of fashion colours indicate that an alternative process is possible. This part of the work aims to recover the chromium1 of wastewater coming from the various chrome using processes and, at the same time, to get an effluent that can be used directly without complementary treatments. It is important to give a clearer and detailed idea of the developed process. Note de contenu : - INTRODUCTION : Resin selection - Wastewater oxidation process - Wastewater loading - Chromium reduction process - EXPERIMENTAL PROCEDURE : Equipment and reagents used - Resin Amberlite IRA-96 - Sample preparation - Wastewater load and reduction - Fluidisation system - Fluidisation mechanism (see appendix for symbols) - Calculation off luidisation for the pilot plant - Reduction in a batch system - Table 1 : Amberlite IRA-96 resin characteristics - Table 2 : Optimal operation conditions - Table 3 : Chromium recovered using acid hydrogen peroxide as reducer - Table 4 : Chromium recovered using sodium bisulphite as reducer - Table 5 : Chromium recovered using glucose as reducer En ligne : https://drive.google.com/file/d/1k7CnOQf4zEsbildKyaGXxsI_elC93m2i/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38963 [article]

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Dyeing wool with a sulphur black dye using a sodium borohydride /sodium bisulphite reducing system / Jackie Y. Cai in COLORATION TECHNOLOGY, Vol. 128, N° 1 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 1 (2012) . - p. 9-20 Titre : Dyeing wool with a sulphur black dye using a sodium borohydride /sodium bisulphite reducing system Type de document : texte imprimé Auteurs : Jackie Y. Cai, Auteur ; John A. Rippon, Auteur ; Jill McDonnell, Auteur ; Anne E. Parnell, Auteur Année de publication : 2012 Article en page(s) : p. 9-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfite de sodium Borohydrure de sodium Le tétrahydruroborate de sodium, aussi appelé borohydrure de sodium, est un composé chimique constitué d'atomes de bore, de sodium et d'hydrogène. Sa formule brute est NaBH4. C'est un agent réducteur utilisé notamment dans l'industrie pharmaceutique en tant que source d'hydrures H-. C'est un solide blanc, souvent rencontré sous forme de poudre. Le borohydrure de sodium absorbe l'humidité de l'air (il est hygroscopique). Il réagit avec l'eau et dégage lentement du dihydrogène, un gaz inflammable/explosif. Selon la classification européenne des produits chimiques, il est enregistré avec la phrase de risque R14 "réagit violemment au contact de l'eau". Le produit se décompose à plus de 400 °C sans fondre. Sa décomposition est violente et exothermique avec l'eau. Colorants -- Stabilité Laine Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Sulphur dyes have been traditionally used for dyeing cellulosic materials, in particular for dark navy and black shades on cotton. This study investigates the feasibility of using the dyestuff CI Sulphur Black 1 as a cost-effective, metal-free alternative to reactive and chrome dyes, to produce deep black shades on wool with high fastness levels. The new wool dyeing procedure uses sodium borohydride and sodium bisulphite as the reducing system for the sulphur dyes. Results are presented on the colour parameters, fastness to washing, alkaline perspiration, light, dry and wet rubbing, and wet burst strength of wool fabrics after dyeing with the sulphur dye. The results have been compared with those of wool dyed by conventional methods with a chrome black and a reactive black dye. It has been shown that the sulphur dye can be used to produce a deep black shade on wool that is comparable with that obtained with either a reactive or chrome black dyestuff. With the exception of wet rubbing, the fastness properties are generally similar, or better than, those of the reactive and chrome dyes, but fibre damage is greater. Some further work is therefore required to overcome these two disadvantages. Note de contenu : - EXPERIMENTAL : Materials (fabric - Dyes and chemical) - Methods (Laboratory dyeing machine - Dyeing with Lanasol Black CE and Eriochrome Black PV 250% (CI Mordant Black 9) - Dyeing with Sulphur Black BR 200% (CI Sulphur Black 1) - Measurements - RESULTS AND DISCUSSION : Colour characteristics of wool dyed with Lanasol Black CE or Eriochrome Black PV 250% (CI Mordant Black 9) - Dyeing wool with Sulphur Black BR 200% (CI Sulphur Black 1) (Optimisation of dyeing conditions - Colour characteristics of wool dyed with Sulphur Black BR 200% (CI Sulphur Black 1)) Fastness properties of dyed wool fabrics - Wool fibre damage caused by dyeing DOI : 10.1111/j.1478-4408.2011.00333.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00333.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13091 [article]

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Enhancing dye adsorption of wool by controlled and facile surface modification using sodium bisulphite / Zhe Jiang in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 82-89 Titre : Enhancing dye adsorption of wool by controlled and facile surface modification using sodium bisulphite Type de document : texte imprimé Auteurs : Zhe Jiang, Auteur ; Yiyi Zhang, Auteur ; Nan Zhang, Auteur ; Qiang Wang, Auteur ; Ping Wang, Auteur ; Yuanyuan Yu, Auteur ; Man Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 82-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfite de sodium Colorants -- Adsorption Colorants acides Laine Teinture -- Fibres textiles Traîtements de surface Index. décimale : 667.3 Teinture et impression des tissus Résumé : Wool is a natural biopolymer with special properties, including warmth retention and skin-friendliness. However, its application in the textile industry is limited by the scale layer that covers its surface, which prevents the efficient diffusion of dye into the interior of its fibres, and increases wool's susceptibility to shrinkage during washing. Here, dissolution with sodium bisulphite is used for wool surface modification. The properties of surface dissolved wool are comprehensively characterised, including strength loss, shrinkage rate and dyeability. The three-dimensional images indicated that scale layer was etched. Coupled with Fourier-transform infrared (FTIR) spectra, the test results of strength loss and shrinkage rate indicated that surface dissolution degree can be controlled by time and temperature, and that the process does not break the fibre's main body structure. Dyeability properties, including dye absorption rate, deepness and uniformity at a lower temperature were enhanced, indicating amenability to industrial production. Our findings highlight a novel, efficient method of modifying protein fibre surface for enhancing properties with potential for large-scale application. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - - RESULTS AND DISCUSSION : Three-dimensional surface morphology - Fourier-transform infrared analysis - Disulphide bond analysis - Impact of surface dissolution on loss of wool strength - Impact of surface dissolution on wool shrinkage rate - Dye diffusion in natural versus modified wool dyed with acid milling dye and acid supermilling dye - Performance of raw and surface-modified wool under low temperature dyeing - Dye absorption curve of surface-dissolved wool during low temperature dyeing - Diffusion coefficient analysis - Table 1 : Comparison of performance between raw and surface-modified wool under various concentrations of sodium bisulphite during low temperature dyeing - Table 2 : The diffusion coefficient of raw and surface modified wool using acid milling dye DOI : https://doi.org/10.1111/cote.12573 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12573 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37501 [article]

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Leather fatliquor from hide fleshings / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 5 (09-10/2014) . - p. 199-204 Titre : Leather fatliquor from hide fleshings Type de document : texte imprimé Auteurs : M. A. Habib, Auteur ; A. G. Alshammari, Auteur Année de publication : 2014 Article en page(s) : p. 199-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfite de sodium Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Echarnage Emulsions Huiles et graisses Produit animal Produits de nourriture du cuir Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The huge amount of fleshings from tanneries around the world creates a negative environmental impact, in addition to disposal costs ; these wastes are not well used. This paper presents some innovative processes for reclaiming the fats carried by a large variety of flesh hides or skin wastes, along with the fatty matter separation and modification to obtain a surface active material intended to be used as leather softening agents. The fat was extracted with hot water at a fixed temperature (85 +/- 5°C, solid : water 1:1 w/v and 2 hours stirring time). The fat rich phase was then separated and purified with n-hexane (fats : n-hexane 1:8 w/v, ambiant temperature and one hour stirring time). The fat was cooled to 12°C and filtered under pressure to isolate the unsaturated oleic fraction and exclude the stearic fraction. The chemical evaluation of oleic fraction indicated that it was suitable for the production of leather softening (fatliquoring) agent. The product was treated with sodium bisulfite (1,5 mol/kg based on weight of fat, 85°C, 2 hours stirring and continuous air flow). A good quality fatliquoring agent was produced. Application of the fatliquor emulsion on wet-blue leather showed enhanced mechanical properties, tensile strength, elongation and improved appearance. Thereby the waste was transformed into a valuable resource. Note de contenu : - METHODS : Separation of fat from fleshings - Separation of unsaturated oleic fraction from saturated stearic fraction - Analysis of unsaturated oleic fraction - Sulfitation process - Analysis of sulfited fat - Evaluations of fatliquor emulsion - Fatliquoring process - Evaluation of fatliquored leather - Scanning electron microscope RESULTS AND DISCUSSION : Chemical evaluation of unsaturated fatty matter - Evaluations of fatliquor stability - Characteristics of fatliquored leather En ligne : https://drive.google.com/file/d/1zLV6QB-SAddcE_Eu93_d_uppib5fTtfI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22209 [article]

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Re-utilisation of biomass resources : preparation and application of an organic fertiliser based on waste cattle hair from tannery / Wang Yi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 2 (03-04/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 2 (03-04/2021) . - p. 90-94 Titre : Re-utilisation of biomass resources : preparation and application of an organic fertiliser based on waste cattle hair from tannery Type de document : texte imprimé Auteurs : Wang Yi, Auteur ; Ouyang Mai, Auteur ; Luo Jianxun, Auteur ; Zhang Zhijie, Auteur ; Du Manyi, Auteur ; Wu Peijun, Auteur Année de publication : 2021 Article en page(s) : p. 90-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomasse Bisulfite de sodium Déchets organiques -- Recyclage Engrais organiques Fermentation Hydrolyse Hydroxyde de sodium L'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol. La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude. Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate. La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante. Recyclage (déchets, etc.) Système pileux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to make effective use of cattle hair from a de-hairing process with hair-saving methods during the process of cleaner production in leather industry, complex oxidising materials (ammonium persulfate and hydrogen peroxide) were employed to oxidise and change the colour, structure of waste cattie hair. Then, sodium hydroxide and sodium bisulfite were employed to hydrolyse the de-coloured and de-structured cattle hair. The cattle hair hydrolysate was concentrated and was further fermented using a compound enzyme (neutral protease and pancreatin) so as to make it into an organic fertiliser. Comparing the colour and the structure of the cattle hair, the best conditions of the reaction temperature, the dosage of ammonium persulfate and hydrogen peroxide solution and reaction time for 20g dried cattle hair were confirmed to be 75°C, 4g, 9g and 60 minutes. when the dosage of sodium hydroxide, sodium bisulfite, and reaction time were 8g, 2g and 45 minutes, the hydrolysis rate of the cattle hair and the content of the cattle hair hydrolysate was 95.4% and 17.6%. The solids content of the concentrated cattle hair hydrolysate is 30.8%. when the fermenting conditions are those of 0.15% neutral protease, 0.15% pancreatin and 3 hours, the nitrogen content of the fermented liquid is 338.5mg/L and was prepared as an organic fertiliser that contributes to the growth of plants, which can realise the utilisation of waste cattle hair from the leather industry. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Oxidation of waste cattle hair from tannery - Hydrolysis of oxidised cattle hair and concentration of hydrolysate - Fermentation of the concentrated hydrolysate of waste cattle hair - Applicationof hydrolysate and fermentation liquor of waste cattle hair - RESULTS AND DISCUSSION : Analysis of oxidised waste cattle hair - Analysis of hydrolysis and concentration of waste cattle hair - Analysis of fermentation of concentrated hydrolysate of waste cattle hair - Analysis of the growth of plant using different fertilisers - Table 1 : Parameters of orthogonal experiment of oxidising waste cattie hair - Table 2 : Experimental scheme of oxidized experiment of waste cattle hair with (NH4)2S208 and F1202 - Table 3 : Parameters of orthogonal experiment of hydrolysing waste cattie hair - Table 4 : Experimental scheme of hydrolysis experiment of waste cattie hair with NaOH and NaHSO3 - Table 5 : Parameters of orthogonal experiment of fermenting the hydrolysate - Table 6 : Experimental scheme of fermentation experiment of concentrated hydrolysate - Table 7 : Results of oxidation experiment of waste cattie hair with (NH4)2S208 and H202 - Table 8 : Results of hydrolysis experiment of waste cattie hair with NaOH and NaHSO3 - Table 9 : Results of fermentation experiment of concentrated waste cattie hair hydrolysate - Fig. 1 : Appearance of waste cattle hair - Fig. 2 : Appearance of oxidised and decoloured cattle hair - Fig. 3 : SEM photograph of waste cattle hair - Fig. 4 : SEM photograph of oxidised and decoloured cattle hair - Fig. 5 : Photos of carrot growing for 30 days - Fig. 6 : Photos of lettuce growing for 20 days - Fig. 7 : Photos of pak choi groing for 15 days En ligne : https://drive.google.com/file/d/1RP9r9j4h5adBa3mNWkwzTfQloZAUlYUC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35547 [article]

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Use of high molecular weight biopolymers to improve the properties of chrome-free leather / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 12 (12/2011)  

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Waterborne 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)  

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