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The long-term stability of sodium percarbonate in presence of zeolite as measured by heat flow calorimetry / C. Johansson in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)
[article]
Titre : The long-term stability of sodium percarbonate in presence of zeolite as measured by heat flow calorimetry Type de document : texte imprimé Auteurs : C. Johansson, Auteur ; P. Pekonen, Auteur ; D. Forsström, Auteur Année de publication : 2007 Article en page(s) : p. 210-217 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment
Calorimétrie
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Sodium -- Composés organiques
Sodium -- Composés organiques -- Stabilité
ZéolitesTags : Sodium percarbonate 15630-89-4 Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Heat flow calorimetry has been evaluated as an alternative technique to conventional stability testing of sodium percarbonate [15630-89-4] (SPC) based on analysis of the hydrogen peroxide content. Stability tests were performed with different SPC samples as well as under various experimental conditions. In general, stable samples exhibiting high concentration of hydrogen peroxide were accompanied by low heat flow values. It was found that the results obtained by heat flow calorimetry and conventional stability testing were in agreement. It was also demonstrated that the long-term stability could be predicted from heat flow data obtained during the initial stage of decomposition. Furthermore, different manufacturing and experimental conditions were manifested as a change of the heat flow curve. The results indicate that the rate of heat production is closely associated with the stability of sodium percarbonate, i.e. the rate of decomposition of sodium percarbonate. In presence of zeolite the stability of sodium percarbonate was reduced, particularly under humid conditions. DOI : 10.3139/113.100340 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3207
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 210-217[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008233 - Périodique Bibliothèque principale Documentaires Disponible A novel system of removing décorin, a minor proteoglycan of bovine hides, to improve the quality of leather / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)
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Titre : A novel system of removing décorin, a minor proteoglycan of bovine hides, to improve the quality of leather Type de document : texte imprimé Auteurs : Mila Aldema-Ramos, Auteur ; Cheng-Kung Liu, Auteur Année de publication : 2010 Article en page(s) : p. 222-228 Note générale : Bibliogr. Langues : Américain (ame) Tags : Décorine Protéoglycane 'Enzymes protéolytiques' 'Dépilage oxydant' 'Hydroxyde de sodium' Percarbonate Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Décorin is a minor proteoglycan (part protein and part carbohydrate) of the skin that is among the key components that undergo changes and removal during conversion of hides to leather. The majority of décorin removal takes place during the dehairing of hides, either traditionally with sodium sulfide or by an alternative oxidative dehairing procedure. The oxidative dehairing method using sodium hydroxide and percarbonate, developed by Marmer and Dudley, was utilized. Further removal of décorin by exposure to proteolytic enzymes during pretanning was explored to study the effects on the quality of leather. Additional removal of décorin was observed when an alkaline protease was added during the reliming stage and pepsin was added during the pickling stage in the pretanning treatments of the hides. More pronounced improvement in leather quality, due to more decorin removed, was observed in oxidatively dehaired hides than those dehaired traditionally with sulfides. As the décorin content decreased, the leather product became softer, more stretchable, and tougher than the control leather tanned without adding proteolytic enzymes. Employing the alternative oxidative dehairing process can solve the problem of sulfide toxicity to the environment while at the same time improving the quality of leather if co-treated with proteolytic enzymes. En ligne : https://drive.google.com/file/d/14VZuMQ8i3iqZCzOoCDlZAS4yC_aiNJQp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9721
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 7 (07/2010) . - p. 222-228[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012329 - Périodique Bibliothèque principale Documentaires Disponible