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Lignosulfonate separation using preparative column chromatography / Xinping Ouyang in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10792-10799 Titre : Lignosulfonate separation using preparative column chromatography Type de document : texte imprimé Auteurs : Xinping Ouyang, Auteur ; Pan Zhang, Auteur ; Xueqing Qiu, Auteur Année de publication : 2011 Article en page(s) : pp. 10792-10799 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Column  chromatography Résumé : A two-step chromatographic process was developed for the fractionation of lignosulfonate (LS), a main component of sulfite effluence. LS fractions with low polydispersity were obtained, which enables detailed investigation into the relationship between structure and property of LS with different molecular weight (Mw). Sephacryl S-100 was used for LS separation in the first step, and then Sephadex LH-20 and Sephacryl S-100 were chosen for further separation of LS fractions with Mw below and above 6000 Da, respectively. Although the mechanism of column chromatographic separation of LS was mainly dependent on its molecular size, 0.20 mol/L of NaCl or NaNO3 solution was needed in the mobile phase at pH 5.7 to mirtimize electrostatic interaction and polyelectrolyte effect. Compared with the polyelectrolyte effect, the electrostatic interaction was more important in the LS separation. Because the LS fractions of higher Mw had a characteristic of low negative charge, a mobile phase with high flow rate and high pH value was suitable for separating LS fractions with high Mw. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523896 [article] Lignosulfonate separation using preparative column chromatography [texte imprimé] / Xinping Ouyang, Auteur ; Pan Zhang, Auteur ; Xueqing Qiu, Auteur . - 2011 . - pp. 10792-10799. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10792-10799 Mots-clés : Column  chromatography Résumé : A two-step chromatographic process was developed for the fractionation of lignosulfonate (LS), a main component of sulfite effluence. LS fractions with low polydispersity were obtained, which enables detailed investigation into the relationship between structure and property of LS with different molecular weight (Mw). Sephacryl S-100 was used for LS separation in the first step, and then Sephadex LH-20 and Sephacryl S-100 were chosen for further separation of LS fractions with Mw below and above 6000 Da, respectively. Although the mechanism of column chromatographic separation of LS was mainly dependent on its molecular size, 0.20 mol/L of NaCl or NaNO3 solution was needed in the mobile phase at pH 5.7 to mirtimize electrostatic interaction and polyelectrolyte effect. Compared with the polyelectrolyte effect, the electrostatic interaction was more important in the LS separation. Because the LS fractions of higher Mw had a characteristic of low negative charge, a mobile phase with high flow rate and high pH value was suitable for separating LS fractions with high Mw. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523896