Documents disponibles écrits par cet auteur

Determination of toluene, n-heptane, [emim][EtSO4], and [bmim][MeSO4] ionic liquids concentrations in quaternary mixtures by UV-vis spectroscopy / José S. Torrecilla in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4998–5003 Titre : Determination of toluene, n-heptane, [emim][EtSO4], and [bmim][MeSO4] ionic liquids concentrations in quaternary mixtures by UV-vis spectroscopy Type de document : texte imprimé Auteurs : José S. Torrecilla, Auteur ; Ester Rojo, Auteur ; Julián García, Auteur Année de publication : 2009 Article en page(s) : pp. 4998–5003 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Toluene  Heptane  1-ethyl-3-methylimidazolium  ethylsulfate  1-butyl-3-methylimidazolium  methylsulfate  Ionic  liquids  Correlation  UV−vis  absorbance Résumé : This article reports a new computerized approach to the simultaneous determination of low concentrations of toluene, heptane and 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4]) and 1-butyl-3-methylimidazolium methylsulfate ([bmim][MeSO4]) ionic liquids (ILs) in acetone using a correlation between their concentrations and UV−vis absorbance values. The essential information (absorbance data) from UV−vis spectrometer of quaternary mixtures in acetone was selected by a principal component analysis (PCA) and transferred into linear regressions (LRs) or neural network (NN) trained computer to estimate the concentrations. Such an integrated PCA/NN/UV−vis spectroscopy system is capable of estimating the concentrations of chemicals in acetone, based on the created models and patterns, without any previous phenomenological knowledge. The mean difference between the estimated concentrations using the PCA/NN/UV−vis and the real concentrations of toluene, heptane, [emim][EtSO4], and [bmim][MeSO4] is less than 2.5%. The PCA/NN/UV−vis is one of the first reliable approaches that can be used in the ILs mixtures field to determine the concentration of two ILs and hydrocarbons in quaternary mixtures while at the same time having simple applications. The short time required by PCA/NN/UV−vis to measure all four chemicals makes it especially useful in processes where long sample preparation times are required. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014044 [article] Determination of toluene, n-heptane, [emim][EtSO4], and [bmim][MeSO4] ionic liquids concentrations in quaternary mixtures by UV-vis spectroscopy [texte imprimé] / José S. Torrecilla, Auteur ; Ester Rojo, Auteur ; Julián García, Auteur . - 2009 . - pp. 4998–5003. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4998–5003 Mots-clés : Toluene  Heptane  1-ethyl-3-methylimidazolium  ethylsulfate  1-butyl-3-methylimidazolium  methylsulfate  Ionic  liquids  Correlation  UV−vis  absorbance Résumé : This article reports a new computerized approach to the simultaneous determination of low concentrations of toluene, heptane and 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4]) and 1-butyl-3-methylimidazolium methylsulfate ([bmim][MeSO4]) ionic liquids (ILs) in acetone using a correlation between their concentrations and UV−vis absorbance values. The essential information (absorbance data) from UV−vis spectrometer of quaternary mixtures in acetone was selected by a principal component analysis (PCA) and transferred into linear regressions (LRs) or neural network (NN) trained computer to estimate the concentrations. Such an integrated PCA/NN/UV−vis spectroscopy system is capable of estimating the concentrations of chemicals in acetone, based on the created models and patterns, without any previous phenomenological knowledge. The mean difference between the estimated concentrations using the PCA/NN/UV−vis and the real concentrations of toluene, heptane, [emim][EtSO4], and [bmim][MeSO4] is less than 2.5%. The PCA/NN/UV−vis is one of the first reliable approaches that can be used in the ILs mixtures field to determine the concentration of two ILs and hydrocarbons in quaternary mixtures while at the same time having simple applications. The short time required by PCA/NN/UV−vis to measure all four chemicals makes it especially useful in processes where long sample preparation times are required. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014044

Principal component analysis/UV Spectroscopy for the determination of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid and toluene concentrations in aqueous solutions / José S. Torrecilla in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 4025–4028 Titre : Principal component analysis/UV Spectroscopy for the determination of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid and toluene concentrations in aqueous solutions Type de document : texte imprimé Auteurs : José S. Torrecilla, Auteur ; Ester Rojo, Auteur ; Julián García, Auteur ; Francisco Rodríguez, Auteur Année de publication : 2008 Article en page(s) : p. 4025–4028 Note générale : Bibliogr. p. 4028 Langues : Anglais (eng) Mots-clés : Principal  component  analysis;  UV  spectroscopy;  Aqueous  solutions Résumé : In this paper, a new approach based on the principal component analysis technique (PCA) and UV spectroscopy was applied to the determination of low concentrations of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid ([Emim][EtSO4]) and toluene in aqueous solutions. By optimizing 10 parameters, the integrated PCA/UV spectroscopy system is able to predict [Emim][EtSO4] and toluene concentrations with a mean predictive error of 2.6% without any previous phenomenological knowledge. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701677m [article] Principal component analysis/UV Spectroscopy for the determination of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid and toluene concentrations in aqueous solutions [texte imprimé] / José S. Torrecilla, Auteur ; Ester Rojo, Auteur ; Julián García, Auteur ; Francisco Rodríguez, Auteur . - 2008 . - p. 4025–4028. Bibliogr. p. 4028 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 4025–4028 Mots-clés : Principal  component  analysis;  UV  spectroscopy;  Aqueous  solutions Résumé : In this paper, a new approach based on the principal component analysis technique (PCA) and UV spectroscopy was applied to the determination of low concentrations of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid ([Emim][EtSO4]) and toluene in aqueous solutions. By optimizing 10 parameters, the integrated PCA/UV spectroscopy system is able to predict [Emim][EtSO4] and toluene concentrations with a mean predictive error of 2.6% without any previous phenomenological knowledge. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701677m