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Kinetic and mechanistic study of the influence of micelles on the oxidation of acetone by N-bromophthalimide in aqueous acetic acid medium / Y. R. Katre in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 4/2009 (07-8/2009)
[article]
Titre : Kinetic and mechanistic study of the influence of micelles on the oxidation of acetone by N-bromophthalimide in aqueous acetic acid medium Type de document : texte imprimé Auteurs : Y. R. Katre, Auteur ; K. Tripathi, Auteur ; G. K. Joshi, Auteur ; A. K. Singh, Auteur Année de publication : 2009 Article en page(s) : p. 218-227 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : N-bromophthalimide Cetyltrimethylammonium bromide Sodium dodecyl sulphate Acetone Oxidation Kinetics Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The effect of cationic micelles of Cetyltrimethylammonium bromide (CTAB) and anionic micelles of Sodium dodecyl Sulphate (SDS) on the kinetics of oxidation of acetone by N-Bromophthalimide (NBP) was studied iodometrically at 308 K. In addition to kinetic experiments, conductivity measurements have also been done to obtain critical micelle concentration and other thermodynamic properties. The kinetic observations indicate fractional order and first order dependence, with respect to [Acetone] and [NBP] respectively. Cationic surfactant (CTAB) strongly catalysed the oxidation of acetone in aqueous acetic acid medium and typical kobs and [CTAB] profile was observed i.e. with the progressive increase in [CTAB], the reaction rate increased, at higher concentration constancy in kobs was observed, whereas anionic surfactant (SDS) was found to show no considerable effect on reaction rate. Mercuric acetate and phthalimide exhibited nil effect on the reaction rate. The presence of inorganic salts (KCl, KBr) exhibits positive effect in the reaction rate. The various activation parameters in presence of CTAB and SDS have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The binding constant with surfactants has been evaluated. DOI : 10.3139/113.110027 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6055
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 4/2009 (07-8/2009) . - p. 218-227[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011484 - Périodique Bibliothèque principale Documentaires Disponible Analysis of exempt paint solvents by gas chromatography using solid-phase microextraction / Golden Gate Society for Coatings Technology Technical Committee in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 900 (01/2000)
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Titre : Analysis of exempt paint solvents by gas chromatography using solid-phase microextraction Type de document : texte imprimé Auteurs : Golden Gate Society for Coatings Technology Technical Committee, Auteur Année de publication : 2000 Article en page(s) : p. 69-74 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Analyse chimique Solvant organique Acétone Acétique acide ester méthyle Toluène(4-chloro-a,a,a-trichloro) Chromatographie phase gazeuse Extraction SPE Index. décimale : 667.9 Revêtements et enduits Résumé : Acetone, methyl acetate, and parachlorobenzotrifluoride (PCBTF or Oxsol® 100) have been exempted as VOC solvents by the U.S. Environmental Protection Agency. In measuring coating VOC content, separate methods for determining exempt solvents are required. One such method utilizes solid-phase microextraction (SPME) to sample the headspace of solvent-based coatings to which the surrogates acetone-d6, methyl acetate-d3, and/or metachlorobenzotrifluoride have been added. The sampled exempt coating solvents are thermally desorbed and analyzed using gas chromatography with flame ionization or mass spectral detection. The SPME headspace method has also been used to analyze MEK, butyl acetate, tert-butyl acetate, toluene, and xylene in solventborne coatings, and alcohols in waterborne systems. This paper presents the results obtained for acetone and toluene in a large number of aerosol paints. Additionally, the results from a round-robin study for acetone, methyl acetate, and parachlorobenzotrifluoride in commercial solvent-based coatings are reported. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5855
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 900 (01/2000) . - p. 69-74[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001204 - Périodique Bibliothèque principale Documentaires Disponible 001205 - Périodique Bibliothèque principale Documentaires Disponible