Hydrothermal electrolysis of glycerol using a continuous flow reactor / Yuksel, Asli in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1520–1525 Titre : Hydrothermal electrolysis of glycerol using a continuous flow reactor Type de document : texte imprimé Auteurs : Yuksel, Asli, Auteur ; Koga, Hiromichi, Auteur ; Mitsuru Sasaki, Auteur Année de publication : 2010 Article en page(s) : pp 1520–1525 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrothermal electrolysis Glycerol Continuous flow reactor. Résumé : Hydrothermal electrolysis reactions of glycerol were investigated under various operating conditions to determine the effects of applied DC current, electrolysis time, and alkali concentration on the decomposition mechanism of glycerol. In addition, intermediate products were identified, possible reaction schemes for both hydrothermal electrolysis and hydrothermal degradation of glycerol based on experimental data were clarified, and detailed product analysis was conducted using high performance liquid chromatography (HPLC), gas chromatography with a flame ionization detector (GC-FID), and gas chromatography with a thermal conductivity detector (GC-TCD). For the present study, a continuous flow reactor equipped with titanium electrodes (as cathode and anode), an electric furnace, a heater, a pump, a heat exchanger, a back pressure regulator, and DC supply was used. The main gaseous product was hydrogen, whereas glycolaldehyde, lactic acid, and formic acid were the main liquid products. Results indicate that greater than 92% of the glycerol could be decomposed under optimum conditions by hydrothermal electrolysis using the continuous DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9016418 [article] Hydrothermal electrolysis of glycerol using a continuous flow reactor [texte imprimé] / Yuksel, Asli, Auteur ; Koga, Hiromichi, Auteur ; Mitsuru Sasaki, Auteur . - 2010 . - pp 1520–1525. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1520–1525 Mots-clés : Hydrothermal electrolysis Glycerol Continuous flow reactor. Résumé : Hydrothermal electrolysis reactions of glycerol were investigated under various operating conditions to determine the effects of applied DC current, electrolysis time, and alkali concentration on the decomposition mechanism of glycerol. In addition, intermediate products were identified, possible reaction schemes for both hydrothermal electrolysis and hydrothermal degradation of glycerol based on experimental data were clarified, and detailed product analysis was conducted using high performance liquid chromatography (HPLC), gas chromatography with a flame ionization detector (GC-FID), and gas chromatography with a thermal conductivity detector (GC-TCD). For the present study, a continuous flow reactor equipped with titanium electrodes (as cathode and anode), an electric furnace, a heater, a pump, a heat exchanger, a back pressure regulator, and DC supply was used. The main gaseous product was hydrogen, whereas glycolaldehyde, lactic acid, and formic acid were the main liquid products. Results indicate that greater than 92% of the glycerol could be decomposed under optimum conditions by hydrothermal electrolysis using the continuous DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9016418

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Hydrothermal hydrolysis of hesperidin into more valuable compounds under supercritical carbon dioxide condition / Duangkamol Ruen-ngam in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13545-13551 Titre : Hydrothermal hydrolysis of hesperidin into more valuable compounds under supercritical carbon dioxide condition Type de document : texte imprimé Auteurs : Duangkamol Ruen-ngam, Auteur ; Armando T. Quitain, Auteur ; Mitsuru Sasaki, Auteur Année de publication : 2012 Article en page(s) : pp. 13545-13551 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Supercritical state Carbon dioxide Hydrolysis Résumé : Synergistic effects of utilizing subcritical water and supercritical carbon dioxide were investigated for the hydrolysis of hesperidin into more valuable compounds at a pressure range of 10―25 MPa and temperature of 110―140 °C. The effect of operating conditions such as pressure, temperature, reaction time, and addition of cosolvent such as ethanol were found to affect the hydrolysis rate. Higher yields were obtained at higher carbon dioxide pressure owing to an increase in formation of carbonic acid. Moreover, the rate of reaction was also found to increase with increasing temperature, obtaining higher yields of the main products, hesperetin-β-glucoside and hesperetin. Addition of ethanol as a cosolvent could increase solubility of hesperidin, however, it inhibited the reaction and formation of carbonic acid. At the maximum temperature of 140 °C and pressure of 25 MPa investigated in this work, the highest concentration of hesperetin-β-glucoside of 4.2 mol/L was obtained in a reaction time of 2 h, whereas for hesperetin the highest was 6.9 mol/L obtained in 3 h. Among the hydrolysis methods investigated, the proposed method was the most selective toward formation of the target compounds. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508177 [article] Hydrothermal hydrolysis of hesperidin into more valuable compounds under supercritical carbon dioxide condition [texte imprimé] / Duangkamol Ruen-ngam, Auteur ; Armando T. Quitain, Auteur ; Mitsuru Sasaki, Auteur . - 2012 . - pp. 13545-13551. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13545-13551 Mots-clés : Supercritical state Carbon dioxide Hydrolysis Résumé : Synergistic effects of utilizing subcritical water and supercritical carbon dioxide were investigated for the hydrolysis of hesperidin into more valuable compounds at a pressure range of 10―25 MPa and temperature of 110―140 °C. The effect of operating conditions such as pressure, temperature, reaction time, and addition of cosolvent such as ethanol were found to affect the hydrolysis rate. Higher yields were obtained at higher carbon dioxide pressure owing to an increase in formation of carbonic acid. Moreover, the rate of reaction was also found to increase with increasing temperature, obtaining higher yields of the main products, hesperetin-β-glucoside and hesperetin. Addition of ethanol as a cosolvent could increase solubility of hesperidin, however, it inhibited the reaction and formation of carbonic acid. At the maximum temperature of 140 °C and pressure of 25 MPa investigated in this work, the highest concentration of hesperetin-β-glucoside of 4.2 mol/L was obtained in a reaction time of 2 h, whereas for hesperetin the highest was 6.9 mol/L obtained in 3 h. Among the hydrolysis methods investigated, the proposed method was the most selective toward formation of the target compounds. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508177

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