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Competitive adsorption of C20 − C36 linear paraffins on the amorphous microporous silica − alumina ERS-8 in vapor phase and liquid phase / Ben Li in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7541–7549 Titre : Competitive adsorption of C20 − C36 linear paraffins on the amorphous microporous silica − alumina ERS-8 in vapor phase and liquid phase Type de document : texte imprimé Auteurs : Ben Li, Auteur ; Vincenzo Calemma, Auteur ; Chiara Gambaro, Auteur Année de publication : 2010 Article en page(s) : pp. 7541–7549 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microporous Résumé : Adsorption of C20−C36 linear paraffins on the amorphous microporous silica−alumina ERS-8 was studied at vapor phase and liquid phase conditions. Henry adsorption constants and low coverage adsorption enthalpies were determined using the pulse chromatographic method at temperatures between 90 and 370 °C in gas phase. The low coverage adsorption enthalpy increases linearly with carbon number with 5.5 kJ/mol per additional methyl group. Competitive adsorption in liquid and dense vapor phase conditions was studied by performing column breakthrough experiments with various binary C20−C36 n-paraffin mixtures diluted in short chain length alkane solvents or undiluted as bulk mixture, at temperatures ranging from 25 to 300 °C and pressures from 3 to 110 bar. Both the adsorption capacity and the selectivity are strongly temperature and pressure dependent. At low temperature and high pressure, all n-paraffins are adsorbed equally and no separation is possible. With increasing temperature and decreasing pressure, the density of the bulk phase decreases, and a transition from a pure liquid paraffin stream to a dense vapor stream occurs. In such conditions, longer n-paraffins are adsorbed preferentially compared to the shorter n-paraffins. The selectivity increases with increasing difference in chain length between the adsorbing n-paraffins. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100728h [article] Competitive adsorption of C20 − C36 linear paraffins on the amorphous microporous silica − alumina ERS-8 in vapor phase and liquid phase [texte imprimé] / Ben Li, Auteur ; Vincenzo Calemma, Auteur ; Chiara Gambaro, Auteur . - 2010 . - pp. 7541–7549. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7541–7549 Mots-clés : Microporous Résumé : Adsorption of C20−C36 linear paraffins on the amorphous microporous silica−alumina ERS-8 was studied at vapor phase and liquid phase conditions. Henry adsorption constants and low coverage adsorption enthalpies were determined using the pulse chromatographic method at temperatures between 90 and 370 °C in gas phase. The low coverage adsorption enthalpy increases linearly with carbon number with 5.5 kJ/mol per additional methyl group. Competitive adsorption in liquid and dense vapor phase conditions was studied by performing column breakthrough experiments with various binary C20−C36 n-paraffin mixtures diluted in short chain length alkane solvents or undiluted as bulk mixture, at temperatures ranging from 25 to 300 °C and pressures from 3 to 110 bar. Both the adsorption capacity and the selectivity are strongly temperature and pressure dependent. At low temperature and high pressure, all n-paraffins are adsorbed equally and no separation is possible. With increasing temperature and decreasing pressure, the density of the bulk phase decreases, and a transition from a pure liquid paraffin stream to a dense vapor stream occurs. In such conditions, longer n-paraffins are adsorbed preferentially compared to the shorter n-paraffins. The selectivity increases with increasing difference in chain length between the adsorbing n-paraffins. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100728h

Introduction of a breakage probability function in the hydrocracking reactor model / Simone Gamba in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5656–5665 Titre : Introduction of a breakage probability function in the hydrocracking reactor model Type de document : texte imprimé Auteurs : Simone Gamba, Auteur ; Laura A. Pellegrini, Auteur ; Vincenzo Calemma, Auteur Année de publication : 2009 Article en page(s) : pp. 5656–5665 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : C-C  bonds  Fischer-Tropsch  waxes  Reactor  model  Hydrocracking Résumé : This paper shows how a breakage probability function for the C−C bonds, elaborated from experimental evidence reported in literature, is introduced in the reactor model for the hydrocracking of Fischer−Tropsch waxes. The results demonstrate a better response to the variation of the operating conditions (especially as concerns temperature) and show product distributions closer to the experimental ones than those predicted by the previous model [Pellegrini, L. A. et al. Chem. Eng. Sci. 2008, 63, 4285]. The agreement with the experimental data has also been enhanced introducing a dependence on temperature (in addition to the dependence on the number of carbon atoms) in the expressions for the Langmuir constants and giving the equilibrium constants for isomerization reactions a new function derived from a thermodynamic study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019455 [article] Introduction of a breakage probability function in the hydrocracking reactor model [texte imprimé] / Simone Gamba, Auteur ; Laura A. Pellegrini, Auteur ; Vincenzo Calemma, Auteur . - 2009 . - pp. 5656–5665. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5656–5665 Mots-clés : C-C  bonds  Fischer-Tropsch  waxes  Reactor  model  Hydrocracking Résumé : This paper shows how a breakage probability function for the C−C bonds, elaborated from experimental evidence reported in literature, is introduced in the reactor model for the hydrocracking of Fischer−Tropsch waxes. The results demonstrate a better response to the variation of the operating conditions (especially as concerns temperature) and show product distributions closer to the experimental ones than those predicted by the previous model [Pellegrini, L. A. et al. Chem. Eng. Sci. 2008, 63, 4285]. The agreement with the experimental data has also been enhanced introducing a dependence on temperature (in addition to the dependence on the number of carbon atoms) in the expressions for the Langmuir constants and giving the equilibrium constants for isomerization reactions a new function derived from a thermodynamic study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019455