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Conservation of chromium in the tanning industry / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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Titre : Conservation of chromium in the tanning industry Type de document : texte imprimé Auteurs : Jean J. Tancous, Auteur ; R. Bellingham, Auteur ; W. Kallenberger, Auteur ; A. McDonell, Auteur Année de publication : 1981 Article en page(s) : p. 164-175 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium can be recovered from wet-blue offal trimmings and shavings with substantial saving in chemicals by incineration at 600°C for 5 hr. Pretreating the offal with 0.5 M Na2CO3 and air-drying prior to incineration produced CrO4(2-). The ash obtained by simply incinerating the offal, without pretreatment, contained water-insoluble Cr2O3, which was purified by leaching with water. Chromium and crude protein were extracted efficiently from offal using 5 percent NaIO3, 5 percent H2SO4, and 3 percent NaCl at 40°C. This procedure was effective but expensive. Leather satisfactory as to odor, appearance, and shrinkage temperature was made with chromium recovered from wet-blue offal by incineration and by extraction. Chromium conservation is possible by recycling chromium liquors and by precipitating the chromium from spent tanning liquors before they are combined with other tannery wastes. If the wastes are combined first, other contaminants are introduced that make chromium recovery and reuse difficult. Leaching sludges with H2SO4 produced marginal chemical cost gains. Leather tanned with these solutions had satisfactory shrinkage temperature, but the sludge odors and iron contamination were objectionable. Note de contenu : - Material balance data for offal
- Recovery of chromium from offal by extraction
- Recovery of chromium from offal by incineration
- Recovery of chromium from wastewater sludges by extractionEn ligne : https://drive.google.com/file/d/1pEyRiFVYnS10c-FDaW1wehFc1MPdF7rF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17599
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 164-175[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008514 - Périodique Archives Documentaires Exclu du prêt Halophilic bacteria isolated from brine cured cattle hides / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 80, N° 3 (05-06/1996)
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Titre : Halophilic bacteria isolated from brine cured cattle hides Type de document : texte imprimé Auteurs : Meral Birbir, Auteur ; W. Kallenberger, Auteur ; A. Ilgaz ; David G. Bailey Année de publication : 1996 Article en page(s) : p. 87-90 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Halophilic and halotolerant organisms found on brine cured were isolated and at least partially characterized. All of the halophilic bacteria isolated from the brine cured cattle hide samples used in these experiments were motile. Gram negative, aerobic and extremely pleomorphic organisms. The colonies formed by these bacteria were either bright pink, red, or purple colonies on media containing 27 %, and 30 % salt. The halotolerant colonies on 20 % salt media were all white. Seventy percent of the isolates showed a positive gelatin test. The effect of the different salt solutions on the pH of brine cured hide sample was examinde. When hide samples were placed into a variety of different salt solutions a pH reduction was observed as the organisms grew. The growth rate of halophilic bacteria was examined at room conditions, 37°C and 41°C. Growth was very slow at low temperatures. Halotolerant bacteria and halophilic bacteria grew best at 37°C. The original hide samples used as the source of these halophilic bacteria had a fishy odor and a large area of reddish discoloration on the flesh side typical of "red heat". En ligne : https://drive.google.com/file/d/1PVmVKGW1CbCTQYGk1V2BmAs-7yo1tN7A/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8154
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 80, N° 3 (05-06/1996) . - p. 87-90[article]Réservation
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