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Fast synthesis of biodiesel at high throughput in microstructured reactors / Peiyong Sun in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1259–1264 Titre : Fast synthesis of biodiesel at high throughput in microstructured reactors Type de document : texte imprimé Auteurs : Peiyong Sun, Auteur ; Bin Wang, Auteur ; Jianfeng Bao, Auteur Année de publication : 2010 Article en page(s) : pp. 1259–1264 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Synthesis--Biodiesel--High  Throughput--Microstructured  Reactors Résumé : Transesterification of cottonseed oil and methanol with KOH as the catalyst for biodiesel production was carried out in microstructured reactors at residence times of less than 1 min and high flow rates. The reaction system included a micromixer that was connected to either a stainless steel capillary (inner diameter of 0.6 mm) or a PTFE tube (inner diameter of 3 mm, packed with Dixon rings) where the reaction is supposed to take place. The influences of the type of the micromixer, the residence time, the methanol-to-oil molar ratio, the flow rate, the type of delay loop, and reaction temperatures below and above the boiling point of methanol were examined. Flow patterns under different conditions were also examined in transparent microtubes. The results indicated that multilamination micromixers exhibited higher efficiencies in biodiesel production than simple T- and J-type micromixers. A higher yield of biodiesel could be obtained at reaction temperatures above the normal boiling point of methanol. By using the stainless steel capillary as the delay loop, the yield of biodiesel reached 94.8% under the conditions of a methanol-to-oil molar ratio of 8:1, a flow rate of 2.5 mL/min, a residence time of 44 s, and a reaction temperature of 70 °C. Under such circumstances, the pressure drop was 0.8 MPa. By using the PTFE tube packed with Dixon rings as the delay loop, the yield of biodiesel reached 99.5% at the same methanol-to-oil molar ratio and reaction temperature, a flow rate of 10 mL/min, and a residence time of 17 s. The pressure drop was 0.7 MPa. Thus, very fast biodiesel production at high throughput can be achieved in microstructured reactors. ISSN : 0888-5885 [article] Fast synthesis of biodiesel at high throughput in microstructured reactors [texte imprimé] / Peiyong Sun, Auteur ; Bin Wang, Auteur ; Jianfeng Bao, Auteur . - 2010 . - pp. 1259–1264. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1259–1264 Mots-clés : Synthesis--Biodiesel--High  Throughput--Microstructured  Reactors Résumé : Transesterification of cottonseed oil and methanol with KOH as the catalyst for biodiesel production was carried out in microstructured reactors at residence times of less than 1 min and high flow rates. The reaction system included a micromixer that was connected to either a stainless steel capillary (inner diameter of 0.6 mm) or a PTFE tube (inner diameter of 3 mm, packed with Dixon rings) where the reaction is supposed to take place. The influences of the type of the micromixer, the residence time, the methanol-to-oil molar ratio, the flow rate, the type of delay loop, and reaction temperatures below and above the boiling point of methanol were examined. Flow patterns under different conditions were also examined in transparent microtubes. The results indicated that multilamination micromixers exhibited higher efficiencies in biodiesel production than simple T- and J-type micromixers. A higher yield of biodiesel could be obtained at reaction temperatures above the normal boiling point of methanol. By using the stainless steel capillary as the delay loop, the yield of biodiesel reached 94.8% under the conditions of a methanol-to-oil molar ratio of 8:1, a flow rate of 2.5 mL/min, a residence time of 44 s, and a reaction temperature of 70 °C. Under such circumstances, the pressure drop was 0.8 MPa. By using the PTFE tube packed with Dixon rings as the delay loop, the yield of biodiesel reached 99.5% at the same methanol-to-oil molar ratio and reaction temperature, a flow rate of 10 mL/min, and a residence time of 17 s. The pressure drop was 0.7 MPa. Thus, very fast biodiesel production at high throughput can be achieved in microstructured reactors. ISSN : 0888-5885

Odor properties and volatile compounds analysis of torreya grandis aril extracts / Liying Niu in The journal of essential oil research, Vol. 23 N° 4 (Juillet/Août 2011) 

Public ISBD [article]  in The journal of essential oil research > Vol. 23 N° 4 (Juillet/Août 2011) . - pp. 1-6 Titre : Odor properties and volatile compounds analysis of torreya grandis aril extracts Type de document : texte imprimé Auteurs : Liying Niu, Auteur ; Jianfeng Bao, Auteur ; Lei Zhao, Auteur Année de publication : 2011 Article en page(s) : pp. 1-6 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Torreya  grandis  Odor  Volatile  components  ITEX-GC-FID/MS  QDA Index. décimale : 646 Résumé : The odor properties of samples extracted from the aril of the Chinese traditional medical plant Torreya grandis by hydrodistillation (HD), supercritical fluid carbon dioxide extraction (SFE) and solvent extraction (SE) were investigated by a trained panel applying quantitative descriptive analysis (QDA) with a 5-point intensity scale. At the same time, the volatile profiles were studied by in-tube extraction and direct thermal desorption gas chromatography equipped with fame ionization detector and hyphenated to mass spectrometry (ITEX-GC-FID/MS). The SE sample showed most a unpleasant “sweaty, pungent” odor, while the SFE sample exhibited an appreciated “citric, sweet, floral” odor, and the HD sample was distinguished by its “minty” sensory attributes. Moreover, the HD sample was characterized by the highest concentration of oxygenated monoterpenes (7.9%), while the SFE sample had the highest relative content of sequiterpenes (23.6%). On the other hand, the SE sample was distinguished by the high amount of aliphatic acids (0.8%). The significant difference in the odor properties of the three extracts is attributed to the large diversity in their compositions. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2011.9700461 [article] Odor properties and volatile compounds analysis of torreya grandis aril extracts [texte imprimé] / Liying Niu, Auteur ; Jianfeng Bao, Auteur ; Lei Zhao, Auteur . - 2011 . - pp. 1-6. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 23 N° 4 (Juillet/Août 2011) . - pp. 1-6 Mots-clés : Torreya  grandis  Odor  Volatile  components  ITEX-GC-FID/MS  QDA Index. décimale : 646 Résumé : The odor properties of samples extracted from the aril of the Chinese traditional medical plant Torreya grandis by hydrodistillation (HD), supercritical fluid carbon dioxide extraction (SFE) and solvent extraction (SE) were investigated by a trained panel applying quantitative descriptive analysis (QDA) with a 5-point intensity scale. At the same time, the volatile profiles were studied by in-tube extraction and direct thermal desorption gas chromatography equipped with fame ionization detector and hyphenated to mass spectrometry (ITEX-GC-FID/MS). The SE sample showed most a unpleasant “sweaty, pungent” odor, while the SFE sample exhibited an appreciated “citric, sweet, floral” odor, and the HD sample was distinguished by its “minty” sensory attributes. Moreover, the HD sample was characterized by the highest concentration of oxygenated monoterpenes (7.9%), while the SFE sample had the highest relative content of sequiterpenes (23.6%). On the other hand, the SE sample was distinguished by the high amount of aliphatic acids (0.8%). The significant difference in the odor properties of the three extracts is attributed to the large diversity in their compositions. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2011.9700461