Synthesis of lactic acid by alkaline hydrothermal conversion of glycerol at high glycerol concentration / Camilo A. Ramirez-Lopez in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6270–6278 Titre : Synthesis of lactic acid by alkaline hydrothermal conversion of glycerol at high glycerol concentration Type de document : texte imprimé Auteurs : Camilo A. Ramirez-Lopez, Auteur ; José R. Ochoa-Gomez, Auteur ; Maria Fernandez-Santos, Auteur Année de publication : 2010 Article en page(s) : pp. 6270–6278 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : lactic acid Hydrothermal Résumé : The synthesis of lactic acid by alkaline hydrothermal conversion of glycerol at high glycerol concentrations under autogenous pressure is described. Temperature (250−290 °C), NaOH/glycerol molar ratio (1.1−1.75), glycerol concentration (2.5−3.5 M), and reaction time (30−250 min) have been the variables studied with temperature and NaOH/glycerol molar ratio having the major influence. An 84.5% lactic acid (as sodium lactate) yield is obtained at 280 °C and 90 min with a 2.5 M glycerol concentration and a 1.1 NaOH/glycerol molar ratio. The same yield is obtained starting from crude glycerol from biodiesel production as raw material. Sodium acrylate, oxalate and formate, and sodium carbonate have been identified as the main byproducts with carbonate being the major one. Several conversion routes based on the experimental results are proposed. A process for lactic acid separation based on electrodialysis is outlined. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001586 [article] Synthesis of lactic acid by alkaline hydrothermal conversion of glycerol at high glycerol concentration [texte imprimé] / Camilo A. Ramirez-Lopez, Auteur ; José R. Ochoa-Gomez, Auteur ; Maria Fernandez-Santos, Auteur . - 2010 . - pp. 6270–6278. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6270–6278 Mots-clés : lactic acid Hydrothermal Résumé : The synthesis of lactic acid by alkaline hydrothermal conversion of glycerol at high glycerol concentrations under autogenous pressure is described. Temperature (250−290 °C), NaOH/glycerol molar ratio (1.1−1.75), glycerol concentration (2.5−3.5 M), and reaction time (30−250 min) have been the variables studied with temperature and NaOH/glycerol molar ratio having the major influence. An 84.5% lactic acid (as sodium lactate) yield is obtained at 280 °C and 90 min with a 2.5 M glycerol concentration and a 1.1 NaOH/glycerol molar ratio. The same yield is obtained starting from crude glycerol from biodiesel production as raw material. Sodium acrylate, oxalate and formate, and sodium carbonate have been identified as the main byproducts with carbonate being the major one. Several conversion routes based on the experimental results are proposed. A process for lactic acid separation based on electrodialysis is outlined. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001586

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