Documents disponibles écrits par cet auteur

Liquid−liquid extraction of low-concentration aniline from aqueous solutions with salts / Xiaohua Wu in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2581–2588 Titre : Liquid−liquid extraction of low-concentration aniline from aqueous solutions with salts Type de document : texte imprimé Auteurs : Xiaohua Wu, Auteur ; Zhigang Lei, Auteur ; Qunsheng Li, Auteur Année de publication : 2010 Article en page(s) : pp. 2581–2588 Note générale : Idustrial Chemistry Langues : Anglais (eng) Mots-clés : Liquid  Extraction  Low-Concentration  Aniline  Aqueous  Solutions  Salts Résumé : The focus of this work was to concentrate aniline at low concentration from water samples using liquid−liquid extraction with salts. The salts included inorganic solid salts and ionic liquids and were added to the system of water + aniline + MTBE (methyl tert-butyl ether) to intensify the conventional liquid−liquid extraction process. The influence of such factors as extraction time, initial aqueous aniline concentration, phase volume ratio, and extraction temperature on the extraction process was investigated to determine the optimum extraction conditions. It was found that the salting effect of K2CO3 on aniline and water is the highest among all of the salts investigated, whereas the imidazolium-based ionic liquids do not bring about a good extraction efficiency as expected. The complex formation and interaction force of the systems containing salts were determined using FTIR (Fourier transform infrared) spectrometry and density functional theory (DFT). This work also tries to explain the separation mechanism by means of the Hofmeister series and quantum chemistry. ISSN : 0885-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9012979 [article] Liquid−liquid extraction of low-concentration aniline from aqueous solutions with salts [texte imprimé] / Xiaohua Wu, Auteur ; Zhigang Lei, Auteur ; Qunsheng Li, Auteur . - 2010 . - pp. 2581–2588. Idustrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2581–2588 Mots-clés : Liquid  Extraction  Low-Concentration  Aniline  Aqueous  Solutions  Salts Résumé : The focus of this work was to concentrate aniline at low concentration from water samples using liquid−liquid extraction with salts. The salts included inorganic solid salts and ionic liquids and were added to the system of water + aniline + MTBE (methyl tert-butyl ether) to intensify the conventional liquid−liquid extraction process. The influence of such factors as extraction time, initial aqueous aniline concentration, phase volume ratio, and extraction temperature on the extraction process was investigated to determine the optimum extraction conditions. It was found that the salting effect of K2CO3 on aniline and water is the highest among all of the salts investigated, whereas the imidazolium-based ionic liquids do not bring about a good extraction efficiency as expected. The complex formation and interaction force of the systems containing salts were determined using FTIR (Fourier transform infrared) spectrometry and density functional theory (DFT). This work also tries to explain the separation mechanism by means of the Hofmeister series and quantum chemistry. ISSN : 0885-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9012979

Selection of ionic liquids as entrainers for the separation of ethyl acetate and ethanol / Qunsheng Li in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9006–9012 Titre : Selection of ionic liquids as entrainers for the separation of ethyl acetate and ethanol Type de document : texte imprimé Auteurs : Qunsheng Li, Auteur ; Jiguo Zhang, Auteur ; Zhigang Lei, Auteur Année de publication : 2009 Article en page(s) : pp. 9006–9012 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ionic  liquidsMolecular  structures  Vapor−liquid  equilibrium Résumé : This work tries to explore the relation between molecular structures of ionic liquids (ILs) as entrainers and separation performance on ethyl acetate (1) and ethanol (2). The vapor−liquid equilibrium (VLE) data have been measured for ethyl acetate (1) + ethanol (2) containing ILs at 101.32 kPa. The ionic liquids investigated were 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]+[BF4]−) and 1-methyl-3-octylimidazolium tetrafluoroborate ([OMIM]+[BF4]−), as well as 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]+[BF4]−) that has been studied in our previous work. All the ILs could give rise to the salting-out effect. It was found that, at low IL concentration, the separation ability of ILs is in the order [EMIM]+[BF4]− > [BMIM]+[BF4]− > [OMIM]+[BF4]−, while at high IL concentration (x3 = 0.10−0.30) the separation ability of ILs is in the order [OMIM]+[BF4]− > [EMIM]+[BF4]− > [BMIM]+[BF4]− due to the difference of polarity of the three ILs and demixing effect. [EMIM]+[triflate]− was included as entrainer and compared with the tetrafluoroborate-based ILs. The measured ternary data were correlated using the NRTL model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017127 [article] Selection of ionic liquids as entrainers for the separation of ethyl acetate and ethanol [texte imprimé] / Qunsheng Li, Auteur ; Jiguo Zhang, Auteur ; Zhigang Lei, Auteur . - 2009 . - pp. 9006–9012. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9006–9012 Mots-clés : Ionic  liquidsMolecular  structures  Vapor−liquid  equilibrium Résumé : This work tries to explore the relation between molecular structures of ionic liquids (ILs) as entrainers and separation performance on ethyl acetate (1) and ethanol (2). The vapor−liquid equilibrium (VLE) data have been measured for ethyl acetate (1) + ethanol (2) containing ILs at 101.32 kPa. The ionic liquids investigated were 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]+[BF4]−) and 1-methyl-3-octylimidazolium tetrafluoroborate ([OMIM]+[BF4]−), as well as 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]+[BF4]−) that has been studied in our previous work. All the ILs could give rise to the salting-out effect. It was found that, at low IL concentration, the separation ability of ILs is in the order [EMIM]+[BF4]− > [BMIM]+[BF4]− > [OMIM]+[BF4]−, while at high IL concentration (x3 = 0.10−0.30) the separation ability of ILs is in the order [OMIM]+[BF4]− > [EMIM]+[BF4]− > [BMIM]+[BF4]− due to the difference of polarity of the three ILs and demixing effect. [EMIM]+[triflate]− was included as entrainer and compared with the tetrafluoroborate-based ILs. The measured ternary data were correlated using the NRTL model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017127