An environmentally friendly leather-making process based on silica chemistry / Yuansen Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 3 (03/2010) . - p. 84-93 Titre : An environmentally friendly leather-making process based on silica chemistry Type de document : texte imprimé Auteurs : Yuansen Liu, Auteur ; Chen Yi, Auteur ; Jian Yao, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur ; Biyu Peng, Auteur Année de publication : 2010 Article en page(s) : p. 84-93 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An environmentally friendly leather process involving a lime-free liming process and a nano-SiO2 tanning process based on silica chemicals was investigated. The investigation included evaluation of the environment characteristics of this process, gelatin recovery from shavings together with the hydrothermal stability and mechanical properties of resultant leathers. The results indicated that the lime-free liming process based on sodium silicate and enzyme had an equivalent effect on fiber opening compared with conventional liming process. The physical strength and shrinkage temperature of the resultant leather tanned with nano-SiO2 were all higher than the stipulated chinese standards of chrome-free leather and were close to the chrome tanned leather control. More importantly, the lime sludge and chromium were at zero discharge because lime and chrome were not used in this experimental in this experimental proces. The total water consumption, raw shin basis, was decreased from 16.15L./Kg to 14.20L/Kg. At the same time, the values of biochemical oxygen demand (BOD5), the chemical oxygen demand (COD), the total nitrogen content (TNC) and total solids (S) in wastewater were all lower than the conventional process, showing reductions of 30 %, 45 %, 55 % and 72 %, respectively. BOD5/COD analysis revealed that the waste water from experimental treatment was more biodegradable than that of control treatment. Another interesting result was that the nano-SiO2 shavings produced in this process could be easily reused. High quality gelatin without chromium was obtained and large amount of water and chemical materials was saved in recovery process, so the secondary pollution caused by the traditional recovery of chrome shaving could be avoided. En ligne : https://drive.google.com/file/d/12yIYt3clTocc0TfDF3GZQ0P6CG6X2IxL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8733 [article]

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The biodegradabilities of rape oil-based fatliquors prepared from different methods / Zhaoyang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 4 (04/2010) . - p. 121-128 Titre : The biodegradabilities of rape oil-based fatliquors prepared from different methods Type de document : texte imprimé Auteurs : Zhaoyang Luo, Auteur ; Jian Yao, Auteur ; Haojun Fan, Auteur ; Xia Chunchun, Auteur ; Shanshan Wang, Auteur Année de publication : 2010 Article en page(s) : p. 121-128 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Huile de colza Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Rape oil-based fatliquors were prepared from different methods such as sulfated, sulfonated, oxidized-sulphited, phosphated or copolymerization and their biodegradabilities were investigated by evaluations of the respirations, BOD5/COD values and COD, TOC removal ratios. The results indicate that the BOD5/COD values and the COD, TOC removal ratio of all products are higher than 0.45 and 85 %, respectively, showing a biodegradability order of phosphate>sulfonated>oxidized-sulphited>sulfated>copolymeric and biodegradable characteristics. Further study indicates that the difference in the biodegradability is closely related to the content of double bonds and hydroxyl groups in resultant fatliquors for different modification methods ; the one which consumes the double bonds or hydroxyl groups will decrease its biodegradability, whilst others which do not consume the double bonds or hydroxyl groups will impart the product better biodegradability. Note de contenu : - EXPERIMENTS : Materials - Preparation of rape oil-based fatliquors - Characterizations - RESULTS AND DISCUSSION : Relationships among the respiration BOD5/COD value, COD, TOC removal ratios and biodegradation - The influence of modification methods on the active groups of fatliquors - The biodegradabilities of rape oil-based fatliquors En ligne : https://drive.google.com/file/d/1UwLRlV8KkI3BFtX3dtr05_wUW1XUULxk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21997 [article]

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