A continuous-flow bubble column reactor for biodiesel production by non-catalytic transesterification
ABSTRACT A continuous-flow bubble column reactor for biodiesel production by non-catalytic transesterification of triglycerides has been developed. The principle of a bubble column reactor for transesterification is similar to reactive distillation, where the reaction products in the gas phase are continuously removed from the reactive zone, while oil, as the reactant, is retained in the reactive zone (liquid phase). A dedicated laboratory-scale continuous-flow bubble column reactor, with a predetermined 200 mL liquid volume of palm oil in the reactor, has been used for this study. In this study, the effects of the methanol feed flow rates (1.5, 3.0, and 6.0 mL/min) and reaction temperatures (250, 270, and 290 °C) on the biodiesel productivity and methyl esters content in the biodiesel product were evaluated. The biodiesel productivity increased with MeOH feed flow rate and reaction temperature correspondingly. On the other hand, the purity of the methyl ester in the biodiesel product decreased.
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ABSTRACT: The hydrodynamics of an air–water flow in a column has been analyzed. The reactor consisted of a vertical column of 0.055 m diameter and 0.255 m height, made of acrylic to achieve good visualization of the bubbles. The column was partially packed with solid cylindrical pellets. The study was focused on the region above the packed zone in three vertical positions. Measurements of velocity in ascendant flow direction were conducted at each position using laser Doppler anemometry. Velocities along the column diameter were experimentally determined for two liquids flow, 300 and 600 L/h. Two conditions of Reynolds number were obtained, Re: 8.3 and 16.7 × 103 based on inlet pipe diameter and water properties. The results show that the size and shape of the bubbles become smaller and uniform when the column was packed. Experimental measurements of the velocity were difficult to determine when the Re was higher (Re > 17 × 103). Also, the velocity profile showed instability of the flow, mainly in the near packed region. However, an average value of the velocity could be observed as function of the inlet condition.Desalination and water treatment 07/2014; DOI:10.1080/19443994.2014.939876 · 1.17 Impact Factor
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ABSTRACT: In this high demand of renewable energy market, biodiesel was extensively produced via various catalytic and non-catalytic technologies. Conventional catalytic transesterification for biodiesel production has been shown to have limitation in terms of sensitivity to high water and free fatty acid, complicated separation and purification of biodiesel. In this study, an alternative and innovative approach was carried out via non-catalytic superheated methanol technology to produce biodiesel. Similar to supercritical reaction, the solvent need to be heated beyond the critical temperature but the reactor pressure remained at 0.1 MPa (atmospheric pressure). Transesterification reaction with superheated methanol was carried out at different reaction temperature within the limit of 270-300 degrees C and at different methanol flow rate ranging from 1 ml/min to 3 ml/min for 4 h. Results obtained showed that the highest biodiesel yield at 71.54% w/w was achieved at reaction temperature 290 degrees C and methanol flow rate at 2 ml/min with 88.81% w/w FAME content, implying the huge potential of superheated technology in producing FAME. (c) 2014 Elsevier Ltd. All rights reserved.Energy Conversion and Management 11/2014; 87:1231-1238. DOI:10.1016/j.enconman.2014.02.037 · 3.59 Impact Factor