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Study of fatliquoring parameters using experimental design / Mariliz Gutterres in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 171-175 Titre : Study of fatliquoring parameters using experimental design Type de document : texte imprimé Auteurs : Mariliz Gutterres, Auteur ; Leticia Melo Dos Santos, Auteur Année de publication : 2009 Article en page(s) : p. 171-175 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather market is becoming more demanding in terms of quality and competitive cost. Thereby, leather producers are searching for efficient processes in order to reduce the waste load and improve the quality of the final product. For the production of garment and upholstery leather (automotive and furniture), fatliquoring is a fundamental stage, since it provides characteristics such as softness, pleasant feel and strength. Fatliquors are offered to the leather as emulsions and they are incorporated into the structure, influencing its properties. This work presents a study of the fatliquoring process, aiming at the evaluation of the amount of oil absorbed by the leather and its physical-mechanical characteristics. The process formulation used was appropriate for the production of furniture upholstery leather, which demands high amounts of fatliquoring products. Fatliquoring parameters of temperature, pH of neutralization, pH at fixation and fixation time were studied. Experimental design and analysis of variance (ANOVA) have been used as statistical tools for determining the parameters' effects. the process efficiency and the leather quality were measured by oil concentration and chemical oxygen demand (COD)in residual baths and oil content, softness, tensile strength, elongation and tear load of the leather. The process variables have not influenced the physical resistances. However, the temperature made a significant contribution and enhanced the oil content in the leather and softness, as well as helped to diminish the oil concentration and COD of the residual baths. The pH at fixation significantly enhanced the oil content in leather and diminished the oil concentration and COD of the residual baths. The fatliquoring effect on physical-mechanical resistance (tensile strength, elongation and tear load) has been compared to samples that were only pre-fatliquored. En ligne : https://drive.google.com/file/d/1KsPG_LM7AZFiAbDsoWQuOuOGMjFK7tdl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6275 [article]

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Recovery of organic nitrogen from beamhouse wastewater in a hair recovery process / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 176-182 Titre : Recovery of organic nitrogen from beamhouse wastewater in a hair recovery process Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Joaquim Font, Auteur ; A. Rius, Auteur ; M. Reyes, Auteur ; Sara Cuadros, Auteur ; E. Bautista, Auteur Année de publication : 2009 Article en page(s) : p. 176-182 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, in addition to the extrinsic contamination attribuable to chemical products not absorbed by the hides, there is intrinsic contamination produced by the hides themselves. from each 100 kgs of raw material, 15 kgs of solubilised protein will end up in wastewater in the early stages of the process of transforming hides into leather. These proteins contain nearly 18% of nitrogen. In this study it is proposed to recover organic nitrogen from the proteins present in the effluents of the beamhouse operations of hides and the subsequent revalorization of the protein fraction obtained. This work seeks to characterize (the chemical oxigen demand (COD), total nitrogen, ammonium nitrogen, total soluble nitrogen, particulate nitrogen, organic nitrogen and protein) the wastewaters, individually or in groups, of the various beamhouse operations (soaking, unhairing-liming, washing, conditioning, deliming, bating, washing and pickling) with hair recovery. The studies are presented of the determination of the pH value (adjusted by means of buffers of acetic acid/sodium acetate) at which the greatest precipitate of the protein fraction if produced. In addition, the following tests were performed to characterize these precipitates : determination of the quantitative composition of the main components of the protein fraction (humidity, proteins, free amino acids, fats and other matter soluble in dichloromethane and ash) ; heavy metals content, calcium, magnesium, potassium and sodium and the composition in total amino acids with prior acid hydrolysis of the protein fraction with 6N hydrochloric acid. En ligne : https://drive.google.com/file/d/15jtZl0drv7WDsFm3P8MYIps2ch5NYQcV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6276 [article]

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Anionic surfactants : determination by flow injection spectrophotometry. Measurement of trace amounts in tannery effluent without liquid-liquid extraction / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 183-185 Titre : Anionic surfactants : determination by flow injection spectrophotometry. Measurement of trace amounts in tannery effluent without liquid-liquid extraction Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Zhang Xinshen, Auteur ; Yang Yujie, Auteur ; Yu Lan, Auteur ; Sun Jing, Auteur ; Liu Hongyan, Auteur ; Tong Ling, Auteur ; Sun Dongmei, Auteur Année de publication : 2009 Article en page(s) : p. 183-185 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to control the pollution by anionic surfactants in water, and detect anionic surfactants on-line, a simple, accurate and sensitive flow injection spectrophotometric method for simultaneous determination of anionic surfactant in water is proposed in this paper. The method is based on the ion associate formed between sodium dodecylbenzenesulfonate and ethyl violet. Lthe absorbance of the complex is measured using an optical detector at 587nm. Chemical factors and FIA variables affecting the system are also discussed. Under the optimal conditions, the linear range of this method was 10.00-3000.00µ 1-1 ; the detection limit was 0.25µg 1-1 ; the relative standard deviation was 0.814%. This method is suitable for automatic and continuous analysis, and successfully applied to simultaneously determine the content of anionic surfactant in tannery effluent. En ligne : https://drive.google.com/file/d/1y4ake9Jl4MEGkVFTIY-2waewlzP6J2-9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6277 [article]

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THPS pretreatment before tanning (chrome or non-chrome) / Viktoriia Plavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 186-192 Titre : THPS pretreatment before tanning (chrome or non-chrome) Type de document : texte imprimé Auteurs : Viktoriia Plavan, Auteur ; Virgilijus Valeika, Auteur ; O. Kovtunenko, Auteur ; Justa Sirvaityte, Auteur Année de publication : 2009 Article en page(s) : p. 186-192 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The investigation enables us to draw a conclusion that THPS has very good stabilising properties, which allows its use for intensifying the process of chromium tanning by decreasing the consumption of chromium and, at the same time, increasing the shrinkage temperature of the leather. The treatment of pelt with THPS instead of chromium before vegetable-aluminium tanning allows it to reach a shrinkage temperature up to 115°C using half as much tannin. IR-spectroscopy has shown that phosphonium compounds react with amino groups of collagen forming hydrogen and covalent bonds, and this is the reason for the growth in thermal stability of collagen.The closely similar thermal characteristics which were obtained by DTA for phosphonium-vegetable- al tanned leather and conventionnally tanned leather allow us to suppose that the use of phosphonium compounds instead chromium compounds for pelt treatment before vegetable tanning provides the dermal structure with properties analogous to those of chrome. En ligne : https://drive.google.com/file/d/1Yxb6gNru_ZF1Ottvxh2xoW4rFnTQaUWX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6278 [article]

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Chromium(VI) extracted from leather using acid and alkaline artificial perspiration / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 193-196 Titre : Chromium(VI) extracted from leather using acid and alkaline artificial perspiration Type de document : texte imprimé Auteurs : Dai Hong, Auteur ; An Xun, Auteur ; Zhang Zongcai, Auteur Année de publication : 2009 Article en page(s) : p. 193-196 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As we know, when leather and its products are used in contact with skin, perspiration may dissolve components from the leather and this may include Cr(VI) so, using artificial perspiration to extract chromium (VI) in leather is of significance. Determination of chromium(VI) in leather using extraction with pH5.5 and 8.0 artificial perspiration solution and subsequent determination with DPC photometric method has been studied. The linearity, repeatability and recovery percentage were tested to evaluate the determination methods. The results show that the experimental methods have good linearity, feasibility and reliability. The result also illustrate that less chromium(VI) is extracted from leather with pH5.5 artificial perspiration solution than with pH8.0 alkaline artificial perspiration solution. En ligne : https://drive.google.com/file/d/1Wg24MAwKyqSwq_Uqso4GswqrBrC1uKJP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6279 [article]

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Isolation and identification of bacteria and yeast in leather shoes worn by diabetics / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 197-200 Titre : Isolation and identification of bacteria and yeast in leather shoes worn by diabetics Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Haibin Gu, Auteur ; Yi Cao, Auteur ; Zhou Rongqing, Auteur ; Huang Jun, Auteur ; Wuyong Chen, Auteur Année de publication : 2009 Article en page(s) : p. 197-200 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacteria and yeast present in the leather shoes worn by diabetics were isolated by the pour plate method, and the isolates were identified using morphological and genetic methods. Results showed that the predominant isolates there were eight species of bacteria, i.e. bacillus cereux, B. fusiformis, B. subtilis, stenotrophomonas maltophilia, enterobacter hormaechei subsp. oharae, mycobacterium mucogenicum, klebsiella sp. and acinetobacter sp. and two species of yeasts, i.e.cryptococcus albidus and rhodotorula mucilaginosa. These results may contribute to making shoes with antibacterial function for diabetics. En ligne : https://drive.google.com/file/d/16fcyC5T5HgSIV3j5D0ZZnDLyc6l0if0P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6280 [article]

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Phosphorylated collagen fibre : preparation and use for adsorbing heavy metals / Jiao Limin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 201-206 Titre : Phosphorylated collagen fibre : preparation and use for adsorbing heavy metals Type de document : texte imprimé Auteurs : Jiao Limin, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 201-206 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Phosphorylated collagen fibre (P-CF) was prepared using phosphorus oxychloride as a phosphorylating reagent. Solid state 31P-NMR and FTIR analysis proved that phosphate groups were bound with amino groups of collagen fibre.As a novel fibrous adsorbent, P-CF performed to be an effective adsorbent for metal ions, such as Pb2+, Cd2+, Co2+, Ni2+, Cu2+, Zn2+ and UO2 2+. By using Cd2 as probe ion, the fundamental adsorption behaviours of P-CF to metal ions were investigated. The adsorption capacity was significatly influenced by pH value, and the optimal pH for adsorbing Cd2+ located in the pH range of 3.83-6.22. The adsorption isotherms of Cd2+ were well fitted by the langmuir equation. The adsorption capacity was increased with the increase of temperature. The adsorption kinetics was satisfactorily described by the pseudo-second-order rate model, implying that the chemical adsorption of P-CF to Cd2+ is the rate controlling step. Moreover, P-CF can be easily desorbed using dilute HNO3 solution. En ligne : https://drive.google.com/file/d/1f1luv_KVuG7Luz_kx7kxwST9GisqfiqD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6281 [article]

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