Mass transfer enhancement in liquid−liquid extraction with very dilute aqueous salt solutions / Javad Saien in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10008–10014 Titre : Mass transfer enhancement in liquid−liquid extraction with very dilute aqueous salt solutions Type de document : texte imprimé Auteurs : Javad Saien, Auteur ; Fatemeh Ashrafi, Auteur Année de publication : 2010 Article en page(s) : pp. 10008–10014 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Liquid−  liquid extraction chemical system Mass transfer Résumé : The effect of very low salt addition in the recommended liquid−liquid extraction chemical system of toluene−acetone−water was investigated with circulating single drops and in both of the mass transfer directions. By adding sodium chloride, potassium chloride, and potassium iodide, within the concentration range of 10−6−10−4 mol/L, into the continuous phase and under constant pH, the mass transfer rate finds enhancements to about 425%. A high trend of variation was observed for the salt concentrations until only about 10−5 mol/L. This phenomenon can be attributed to the hydration of ions which favors acetone to be transferred easier in the aqueous phase. Small drops are usually more benefited, and the rate of mass transfer is greater for the dispersed to continuous phase direction under similar conditions due to a higher dominant extraction fraction, whereas the drop size decreases in this direction. The effectiveness of salts in this matter appeared to be in the order of NaCl > KCl > KI. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900542w [article] Mass transfer enhancement in liquid−liquid extraction with very dilute aqueous salt solutions [texte imprimé] / Javad Saien, Auteur ; Fatemeh Ashrafi, Auteur . - 2010 . - pp. 10008–10014. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10008–10014 Mots-clés : Liquid−  liquid extraction chemical system Mass transfer Résumé : The effect of very low salt addition in the recommended liquid−liquid extraction chemical system of toluene−acetone−water was investigated with circulating single drops and in both of the mass transfer directions. By adding sodium chloride, potassium chloride, and potassium iodide, within the concentration range of 10−6−10−4 mol/L, into the continuous phase and under constant pH, the mass transfer rate finds enhancements to about 425%. A high trend of variation was observed for the salt concentrations until only about 10−5 mol/L. This phenomenon can be attributed to the hydration of ions which favors acetone to be transferred easier in the aqueous phase. Small drops are usually more benefited, and the rate of mass transfer is greater for the dispersed to continuous phase direction under similar conditions due to a higher dominant extraction fraction, whereas the drop size decreases in this direction. The effectiveness of salts in this matter appeared to be in the order of NaCl > KCl > KI. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900542w

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