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Extraction of proteins from chrome shavings with sodium hydroxide and reuse of chromium in the tanning process / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)
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Titre : Extraction of proteins from chrome shavings with sodium hydroxide and reuse of chromium in the tanning process Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; J. Mabrour, Auteur ; S. Alami. Younssi, Auteur ; M. Azzi, Auteur ; A. Messaoudi, Auteur ; A. Albizane, Auteur ; M. Bouhria, Auteur Année de publication : 2004 Article en page(s) : p. 16-25 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this work, the alkaline digestion of chrome shavings with sodium hydroxide was studied. We have demonstrated that the best operating conditions would be about 0.5M for NaOH concentration and 15 minutes for the reaction. The process allows the recovery of proteins in the aqueous phase and the metallic salts in the solid phase (cake). Solid proteins with a high nitrogen percentage and a very low chrome content are recovered after lyophilisation of the liquid. Chemical treatment was used to purify the chrome cake for recycle. The purified chromium was transformed to basic chromic sulfates with basicity 33°S and tanning tests, using cattle hides and goat skins, were carried out to study the tanning capability of the reused product. Characteristics such as chromium oxide content and shrinkage temperature were determined. Apparent quality of obtained leather (penetration of chromium into skins, colouring and firmness of samples in wet blue stage) was also studied. En ligne : https://drive.google.com/file/d/1nrzFBJjA3vCK3JW3anaDm2COJ__uXL3W/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4173
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Code-barres Cote Support Localisation Section Disponibilité 001596 - Périodique Bibliothèque principale Documentaires Disponible 001609 - Périodique Bibliothèque principale Documentaires Disponible Processing chrome tanned solid waste generated in the leather industry : recovery of proteins and synthesis of a pigment for paint / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 1 (01/2001)
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Titre : Processing chrome tanned solid waste generated in the leather industry : recovery of proteins and synthesis of a pigment for paint Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; M. Azzi, Auteur ; A. Albizane, Auteur ; A. Messaoudi, Auteur ; M. Bouhria, Auteur ; A. Sibari, Auteur Année de publication : 2001 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Between the beginning of the tanning of the skins and the delivery of finished leather articles, there is a series of operations that produce a significant quantity of waste. Unfortunately, this waste is only very little reused. Environmental concerns and escalating landfill costs have prompted environmentalists, scientists and research people to look for ways to convert this waste material into more valuable co-products. The objectives of this study are to: evaluate the quantity of wastes generated by the operations involved in the transformation of hides into leather, and revalue the most significant category of tanned wastes, namely chrome shavings and tanned splits. The quantitative study of solid waste showed that the tanning industry produces a high percentage of waste (about 38 percent of the weight of salted hides). The alkaline digestion of tanned waste with calcium hydroxide allows the separation of the proteins and the metallic salts. The proteins are in the aqueous phase and the metallic salts in the solid phase. Solid proteins are recovered after lyophilization of the liquid. The solid residue is incinerated under precise conditions of temperature with a large initial exess of oxygen in order to oxidize the trivalent chromium and transform them into hexavalent state. The dissolution of recovered ash by a dilute solution of nitric acid allows regeneration of a concentrated bichromate solution whose chromium is recovered in the form of solid yellow chromate by the reactions of complexation and precipitation using a solution of lead(II) nitrate. The crystal structure of the precipitate was identified by x-ray diffraction. En ligne : https://drive.google.com/file/d/1MNl7rndwZz2-1P_IBsTMF7BdvmeTET7U/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4399
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Code-barres Cote Support Localisation Section Disponibilité 001559 - Périodique Bibliothèque principale Documentaires Disponible Removal of methylene blue from aqueous solutions by adsorption on tanned solid wastes / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
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Titre : Removal of methylene blue from aqueous solutions by adsorption on tanned solid wastes Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; J. Mabrour, Auteur ; S. Alami. Younssi, Auteur ; M. Bouhria, Auteur ; A. Albizane, Auteur ; A. Messaoudi, Auteur ; M. Azzi, Auteur Année de publication : 2002 Article en page(s) : p. 261-266 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The removal of methylene blue (MB) from aqueous solutions by adsorption on tanned solid wastes was studied in a static batch reactor. The buffing dust sample proved to be a better adsorbent than chrome shavings. pH has anobvious influence on the adsorption of methylene blue onto buffing dust: under acidic conditions (pH<4.5) and at high pH values (pH>10.5), adsorption is less favourable. Four hours of adsorption was chosen as equilibrium time. The maximum adsorption capacity is about 84 mg of methylene blue for each gram of buffing dust. En ligne : https://drive.google.com/file/d/1MsOi0U1VFGuurYTWebuxEfFxTVaoCRnB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4286
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Code-barres Cote Support Localisation Section Disponibilité 001576 - Périodique Bibliothèque principale Documentaires Disponible Study of quality of a pigment prepared by complexation of chromates recovered from treated chrome shavings and tanned splits / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 11 (11/2001)
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Titre : Study of quality of a pigment prepared by complexation of chromates recovered from treated chrome shavings and tanned splits Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; S. Alami. Younssi, Auteur ; M. Bouhria, Auteur ; A. Messaoudi, Auteur ; A. Albizane, Auteur ; M. Azzi, Auteur Année de publication : 2001 Article en page(s) : p. 426-436 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : We have developed a process to treat chrome shavings and tanned splits. These wastes were first treated to recover as much protein as possible, and then treatment was used to transform the chromium, present in residual solid, into yellow pigment. The objective of this work was to study prepared pigment quality. Standard tests were performed to evaluate the effectiveness of this product in the paint industry. En ligne : https://drive.google.com/file/d/159cHVJbbWsfKwhQXo1JQyHvOOewXCLiG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4349
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Code-barres Cote Support Localisation Section Disponibilité 001568 - Périodique Bibliothèque principale Documentaires Disponible Treatment and valorization of leather industry solid wastes : a review / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 2 (02/2009)
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Titre : Treatment and valorization of leather industry solid wastes : a review Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; Miguel de La Guardia, Auteur Année de publication : 2009 Article en page(s) : p. 52-67 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The state-of-the art of the different approaches available in the scientific literature for the treatment and valorization of solid wastes generated from the leather industry has been presented in this review. Tanning processes generate significant volumes of by-products and waste materials and, because of that, tanneries can cause serious negative environment impacts. The advancement of laws protecting the environment have prompted industrialists, environmentalists and scientists to look for the decontamination of wastes and to transform tannery solid waste materials to valuable co-products useful to be recycled or employerin other industries. Examples of the preparation of organic fertilizers, production of biomaterials, gelatins or collagens with multiple applications and production of energy by biomethanization have been proposed as solutions for untanned wastes. Several applications and treatments were proposed for tanned wastes, such as preparation of materials with multiples uses, recovery of proteins and chromium and their valorization, incineration, use of the solid tannery wastes as sorbents or adsorbents for removal of organic pollutants from wastewaters, etc. On the other hand, tannery sludges can be treated and recycled in tanning process or used for various applications in other industries. This paper has been focused onsolutions and answers for researchers and concerned industry leaders who are seeking to improve the environmental quality of their activities in the tannery field. En ligne : https://drive.google.com/file/d/1VIya48zY-RAfKkDI0gb4kc4axHv9icF_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4477
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Code-barres Cote Support Localisation Section Disponibilité 011099 - Périodique Bibliothèque principale Documentaires Disponible