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Beamhouse and tanning operations : process chemistry revisited / T. Ramasami in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 83, N° 1 (01-02/1999)
[article]
Titre : Beamhouse and tanning operations : process chemistry revisited Type de document : texte imprimé Auteurs : T. Ramasami, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; K. Parthasarathi, Auteur ; P. G. Rao, Auteur ; P. Saravanan, Auteur ; R. Gayathri, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 1999 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Leather processing technologies are under critical review in recent times. Traditional methods in leather processing have involved the use of large amounts of water and chemical inputs. The general practice in tanneries has involved the use of nearly 35-40 litres of water per kilogram of leather processed. Processes have not been audited for utilisation of chemical inputs. In some cases, the utilisation levels of chemicals employed fall in the ranges of 40-75 % . Such non-optimum use of chemical and water input has led to problems in both cost effectiveness due to material loss and pollution from unused chemicals. It has become essential that the beamhouse and tanning processes are audited for their environmental loads. Whereas there is sufficient awareness in leather processing industries regarding the costs of compliance with national environmental regulatory norms, the potential benefits of cleaner production technologies with respect to cost saving are not fully understood. Further, with increasing inventory costs, audit of beamhouse and tanning processes is becoming crucial. Process time in leather making operations is influenced by several physico-chemical parameters. One of the major factors influencing process time of beamhouse and tanning operations in leather processing is the duration needed for diffusion of materials. A re-visit to the chemistry of beamhouse and tanning operations at this critical juncture is worthwhile.
An attempt has been made in this work to critically review the process chemistry and discuss possible improvement options. Some case studies are presented in this work where reduction of BOD and COD levels by 30-40 %, Total Dissolved Solids by 25-35 %, sulphide by 50-60 % and chromium by 98-99 % has been achieved under real field conditions through improved beamhouse and tanning operations.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7856
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 83, N° 1 (01-02/1999) . - p. 39-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007023 - Périodique Bibliothèque principale Documentaires Disponible Iron complexes as tanning agents / S. Balasubramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 9 (11/1997)
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Titre : Iron complexes as tanning agents Type de document : texte imprimé Auteurs : S. Balasubramanian, Auteur ; R. Gayathri, Auteur Année de publication : 1997 Article en page(s) : p. 218-224 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Mixed ligand complexes of iron (II) with an aliphatic diamine (ethylenediamine) and a dicarboxyclic acid such as oxalic, malonic, succinic or phthalic acid, were synthesized and used for tanning experiments either alone or in combination with aluminium or vegetable tanning materials. The leather samples obtained in all three methods were tested for hydrothermal stability and iron content. Combination tanned leathers exhibited higher stability when compared to pure iron tanned systems. The iron content in all three systems was low and a direct correlation between metal content and hydrothermal stability could not be made as the factors influencing the strength characteristics in a combination tanned system are quite different from those of pure iron tanned leathers. The vegetable-iron combination tanned leathers were found to be soft and dark. En ligne : https://drive.google.com/file/d/10TVCnfPJRditdv_wlQC6ubyhM2PUHKXO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7571
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCII, N° 9 (11/1997) . - p. 218-224[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006960 - Périodique Bibliothèque principale Documentaires Disponible