Continuous - flow esterification of free fatty acids in a rotating packed bed / Yi-Hung Chen in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4117–4122 Titre : Continuous - flow esterification of free fatty acids in a rotating packed bed Type de document : texte imprimé Auteurs : Yi-Hung Chen, Auteur ; Wang-Chi Lin, Auteur ; Cheng-Hsien Tsai, Auteur Année de publication : 2010 Article en page(s) : pp. 4117–4122 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Esterification Fatty Acid Résumé : The continuous-flow esterification of free fatty acids (FFAs) with methanol for the production of fatty acid methyl esters (FAMEs) using a rotating packed bed (RPB) is presented herein. The RPB, which provides a high centrifugal force and has an adjustable rotational speed, was employed as a novel esterification reactor. The following variables were investigated for their effects on the esterification efficiency: the methanol-FFA molar ratio, the estimated hydraulic retention time, the rotational speed of the packed bed, the reaction temperature, and the catalyst dosage. The conversion of the FFAs in the RPB system significantly depended on the experimental conditions, which influenced the residence time distribution, the esterification reaction rate, and the micromixing intensity. Due to its excellent micromixing characteristics, the RPB system exhibited good efficiency for the esterification reaction in continuous-flow operation. The RPB system achieved the conversion of the FFAs of 10.0−96.6% and the productivity of FAMEs of 0.042−1.20 mol/min. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100112s [article] Continuous - flow esterification of free fatty acids in a rotating packed bed [texte imprimé] / Yi-Hung Chen, Auteur ; Wang-Chi Lin, Auteur ; Cheng-Hsien Tsai, Auteur . - 2010 . - pp. 4117–4122. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4117–4122 Mots-clés : Esterification Fatty Acid Résumé : The continuous-flow esterification of free fatty acids (FFAs) with methanol for the production of fatty acid methyl esters (FAMEs) using a rotating packed bed (RPB) is presented herein. The RPB, which provides a high centrifugal force and has an adjustable rotational speed, was employed as a novel esterification reactor. The following variables were investigated for their effects on the esterification efficiency: the methanol-FFA molar ratio, the estimated hydraulic retention time, the rotational speed of the packed bed, the reaction temperature, and the catalyst dosage. The conversion of the FFAs in the RPB system significantly depended on the experimental conditions, which influenced the residence time distribution, the esterification reaction rate, and the micromixing intensity. Due to its excellent micromixing characteristics, the RPB system exhibited good efficiency for the esterification reaction in continuous-flow operation. The RPB system achieved the conversion of the FFAs of 10.0−96.6% and the productivity of FAMEs of 0.042−1.20 mol/min. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100112s

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System identification and contour tracking of a plane-type 3-DOF precision positioning table / Rong-Fong, Fung in IEEE Transactions on control systems technology, Vol. 18 N° 1 (Janvier 2010)  

Public ISBD [article]  inIEEE Transactions on control systems technology > Vol. 18 N° 1 (Janvier 2010) . - pp. 22-34 Titre : System identification and contour tracking of a plane-type 3-DOF precision positioning table Type de document : texte imprimé Auteurs : Rong-Fong, Fung, Auteur ; Wang-Chi Lin, Auteur Année de publication : 2011 Article en page(s) : pp. 22-34 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Adaptive backstepping control (ABC) Cross-coupling effect Real-coded genetic algorithm (RGA) System identification 3-DOF precision positioning table Index. décimale : 629.1 Résumé : In this paper, an adaptive backstepping control (ABC) method for a plane-type 3-DOF (X,Y,θz) precision positioning table is proposed. First, according to the dynamics of a mechanical mass-spring system, we establish mathematical equations that contain linear viscous frictions and varied elasticities with cross-coupling effects due to mechanical bending. In system identification, the real-coded genetic algorithm (RGA) method is employed to find the optimized parameters, and the dynamic responses of numerical simulations and experimental results are compared. On the basis of the state-space model, the ABC is proposed to track trajectories and impose on the dynamic performance, robustness of parameter variations, and trajectory-tracking errors. The comparisons between numerical simulations and experimental results illustrate the validity of the proposed ABC method for practical applications in contour tracking and also show the performances in reducing the cross-coupling effects. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4895691 [article] System identification and contour tracking of a plane-type 3-DOF precision positioning table [texte imprimé] / Rong-Fong, Fung, Auteur ; Wang-Chi Lin, Auteur . - 2011 . - pp. 22-34. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 1 (Janvier 2010) . - pp. 22-34 Mots-clés : Adaptive backstepping control (ABC) Cross-coupling effect Real-coded genetic algorithm (RGA) System identification 3-DOF precision positioning table Index. décimale : 629.1 Résumé : In this paper, an adaptive backstepping control (ABC) method for a plane-type 3-DOF (X,Y,θz) precision positioning table is proposed. First, according to the dynamics of a mechanical mass-spring system, we establish mathematical equations that contain linear viscous frictions and varied elasticities with cross-coupling effects due to mechanical bending. In system identification, the real-coded genetic algorithm (RGA) method is employed to find the optimized parameters, and the dynamic responses of numerical simulations and experimental results are compared. On the basis of the state-space model, the ABC is proposed to track trajectories and impose on the dynamic performance, robustness of parameter variations, and trajectory-tracking errors. The comparisons between numerical simulations and experimental results illustrate the validity of the proposed ABC method for practical applications in contour tracking and also show the performances in reducing the cross-coupling effects. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4895691

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