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Lactic acid extraction by means of long chain tertiary amines / G. Kyuchoukov in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 9117-9122 Titre : Lactic acid extraction by means of long chain tertiary amines : A comparative theoretical and experimental study Type de document : texte imprimé Auteurs : G. Kyuchoukov, Auteur ; D. Yankov, Auteur Année de publication : 2012 Article en page(s) : pp. 9117-9122 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Lactic  acid Résumé : The extraction of lactic acid with different long chain (from C8 to C12) tertiary amines was studied, both theoretically and experimentally. In view to determine the concentration of free acid and bounded with extractant acid in the aqueous phase, the experimental results were treated by mass balance equations. The minimal and maximal fractions of the free acid and bounded acid were calculated for different compositions of the organic phase. The obtained results clearly showed that in general the interaction product concentration in the aqueous phase could not be neglected and, in some cases, reached more than 50% from the total acid concentration. The disparate influences of inert and active diluents (dodecane and oleyl alcohol, respectively) were elucidated. It was shown that the overall distribution coefficient depends not only on the extraction product concentration in the aqueous phase but also on the composition of the organic phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3005463 [article] Lactic acid extraction by means of long chain tertiary amines : A comparative theoretical and experimental study [texte imprimé] / G. Kyuchoukov, Auteur ; D. Yankov, Auteur . - 2012 . - pp. 9117-9122. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 9117-9122 Mots-clés : Lactic  acid Résumé : The extraction of lactic acid with different long chain (from C8 to C12) tertiary amines was studied, both theoretically and experimentally. In view to determine the concentration of free acid and bounded with extractant acid in the aqueous phase, the experimental results were treated by mass balance equations. The minimal and maximal fractions of the free acid and bounded acid were calculated for different compositions of the organic phase. The obtained results clearly showed that in general the interaction product concentration in the aqueous phase could not be neglected and, in some cases, reached more than 50% from the total acid concentration. The disparate influences of inert and active diluents (dodecane and oleyl alcohol, respectively) were elucidated. It was shown that the overall distribution coefficient depends not only on the extraction product concentration in the aqueous phase but also on the composition of the organic phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3005463

Theoretical and experimental study of lactic acid stripping from loaded organic phase / G. Kyuchoukov in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8238–8243 Titre : Theoretical and experimental study of lactic acid stripping from loaded organic phase Type de document : texte imprimé Auteurs : G. Kyuchoukov, Auteur ; D. Yankov, Auteur Année de publication : 2010 Article en page(s) : pp 8238–8243 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Lactic  acid  Organic  phase. Résumé : The process of stripping lactic acid with different stripping agents was investigated for two organic-phase systems containing trioctylamine (TOA). On the basis of theoretical considerations for extraction mechanism, equations for stripping were developed. The theoretical values of the extent of stripping and the concentrations of lactic acid in organic and aqueous phases were compared with experimental values in the cases of water, NaOH, NaCl, HCl, and carbonates as the stripping agents. The possibilities of repeated use of the extractants in extraction/stripping runs were investigated. The best results were obtained with a system containing 20% TOA, 30% dodecane, and 50% decanol with (NH4)HCO3 as the stripping agent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100914n [article] Theoretical and experimental study of lactic acid stripping from loaded organic phase [texte imprimé] / G. Kyuchoukov, Auteur ; D. Yankov, Auteur . - 2010 . - pp 8238–8243. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8238–8243 Mots-clés : Lactic  acid  Organic  phase. Résumé : The process of stripping lactic acid with different stripping agents was investigated for two organic-phase systems containing trioctylamine (TOA). On the basis of theoretical considerations for extraction mechanism, equations for stripping were developed. The theoretical values of the extent of stripping and the concentrations of lactic acid in organic and aqueous phases were compared with experimental values in the cases of water, NaOH, NaCl, HCl, and carbonates as the stripping agents. The possibilities of repeated use of the extractants in extraction/stripping runs were investigated. The best results were obtained with a system containing 20% TOA, 30% dodecane, and 50% decanol with (NH4)HCO3 as the stripping agent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100914n