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Kinetics of reversible oligomerization of l-lactic acid with a SnCl2·2H2O/p-toluenesulfonic acid catalyst / In Hak Baick in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16617-16625 Titre : Kinetics of reversible oligomerization of l-lactic acid with a SnCl2·2H2O/p-toluenesulfonic acid catalyst Type de document : texte imprimé Auteurs : In Hak Baick, Auteur ; Carla V. Luciani, Auteur ; Seung Young Park, Auteur Année de publication : 2012 Article en page(s) : pp. 16617-16625 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Acid  catalysis  Kinetics Résumé : An experimental and theoretical modeling study is presented on the kinetics of reversible oligomerization of L-lactic acid and the formation of L-lactide in closed reactors with SnCl2·2H2O/p-toluenesulfonic acid as a binary catalyst mixture. The experimental data and model simulations indicate that about 10 wt % L-lactide is produced by the cyclization of two repeating units of poly(L-lactic acid) at the chain end during the oligomerization process. The effects of the catalyst and reaction temperature at 160―200 °C on the discoloration of the reaction mixture have also been investigated, and it was observed that the discoloration of the reaction mixture was quite significant in the presence of the catalyst at high temperatures. The relevant kinetic parameters for the chain-growth reaction as well as cyclic L-lactide formation reaction have been estimated for both noncatalyzed and catalyzed reversible oligomerization reactions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26755625 [article] Kinetics of reversible oligomerization of l-lactic acid with a SnCl2·2H2O/p-toluenesulfonic acid catalyst [texte imprimé] / In Hak Baick, Auteur ; Carla V. Luciani, Auteur ; Seung Young Park, Auteur . - 2012 . - pp. 16617-16625. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16617-16625 Mots-clés : Acid  catalysis  Kinetics Résumé : An experimental and theoretical modeling study is presented on the kinetics of reversible oligomerization of L-lactic acid and the formation of L-lactide in closed reactors with SnCl2·2H2O/p-toluenesulfonic acid as a binary catalyst mixture. The experimental data and model simulations indicate that about 10 wt % L-lactide is produced by the cyclization of two repeating units of poly(L-lactic acid) at the chain end during the oligomerization process. The effects of the catalyst and reaction temperature at 160―200 °C on the discoloration of the reaction mixture have also been investigated, and it was observed that the discoloration of the reaction mixture was quite significant in the presence of the catalyst at high temperatures. The relevant kinetic parameters for the chain-growth reaction as well as cyclic L-lactide formation reaction have been estimated for both noncatalyzed and catalyzed reversible oligomerization reactions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26755625