Synthesis of Jatropha curcas oil-based biodiesel in a pulsed loop reactor.

Abstract Jatropha curcas oil (JCO) has a high content of free fatty acids and has been used extensively as a feedstock in biodiesel production. In the present study, the transesterification reaction of JCO to Jatropha curcas methyl ester (biodiesel) was performed in a continuous pulsed loop reactor under atmospheric conditions. The JCO was pre-treated prior to the reaction to reduce the free fatty acid content to below 1% (w/w). The operating parameters of the loop reactor were optimised based on the conversion of the JCO to Jatropha curcas biodiesel and included reaction temperature, molar ratio of oil to MeOH, reaction time and oscillation frequency. The findings show that the highest reaction conversion of 99.7% (w/w) was achieved using KOH catalyst and 98.8% conversion was obtained using NaOCH3 catalyst. The optimal operating conditions were a molar ratio of 6:1, an oscillation frequency of 6 Hz, temperature of 60 °C, feedstock FFA content of 0.5% (w/w) and only 10 min of reaction time. As a commercial commodity, the physical properties of biodiesel were analysed, and they compared well with the characteristics of fossil-based diesel fuel.

[1]  Adam Harvey,et al.  Process intensification of biodiesel production using a continuous oscillatory flow reactor , 2003 .

[2]  António A. Vicente,et al.  Residence times and mixing of a novel continuous oscillatory flow screening reactor , 2004 .

[3]  Malcolm R. Mackley,et al.  Experimental observations on flow patterns and energy losses for oscillatory flow in ducts containing sharp edges , 1989 .

[4]  Xiongwei Ni,et al.  A comparative study of mass transfer in yeast for a batch pulsed baffled bioreactor and a stirred tank fermenter , 1995 .

[5]  Tao Wang,et al.  Continuous production of biodiesel fuel from vegetable oil using supercritical methanol process , 2007 .

[6]  H. Noureddini,et al.  A continuous process for the conversion of vegetable oils into methyl esters of fatty acids , 1998 .

[7]  J. Jud,et al.  Application of metallic foams in an electrochemical pulsed flow reactor Part I: Mass transfer performance , 1995 .

[8]  J. Marchetti,et al.  Possible methods for biodiesel production , 2007 .

[9]  A. Fakhru’l-Razi,et al.  A simple capillary column GC method for analysis of palm oil-based polyol esters , 2002 .

[10]  D. Darnoko,et al.  Kinetics of palm oil transesterification in a batch reactor , 2000 .

[11]  A. Corma,et al.  Synthesis of transportation fuels from biomass: chemistry, catalysts, and engineering. , 2006, Chemical reviews.

[12]  M. Mackay,et al.  Oscillations flow within tubes containing wall or central baffles , 1991 .

[13]  H. Raheman,et al.  Biodiesel production from jatropha oil (Jatropha curcas) with high free fatty acids: An optimized process , 2007 .

[14]  S. K. Gupta,et al.  Wall heat/mass transfer in pulsatile flow , 1982 .

[15]  Aniruddha B. Pandit,et al.  Enhancement of gas-liquid mass transfer using oscillatory flow in a baffled tube , 1993 .

[16]  R. Yunus,et al.  Kinetics of transesterification of jatropha curcas-based triglycerides with an alcohol in the presence of alkaline catalyst , 2010, 2010 1st International Nuclear & Renewable Energy Conference (INREC).

[17]  W. Fernando,et al.  Technologies for production of biodiesel focusing on green catalytic techniques: A review , 2009 .

[18]  Aw Drews,et al.  Standard Test Method for Conradson Carbon Residue of Petroleum Products , 1998 .

[19]  Dejan Bezbradica,et al.  Enzymatic conversion of sunflower oil to biodiesel in a solvent-free system: process optimization and the immobilized system stability. , 2009, Bioresource technology.

[20]  Hifjur Raheman,et al.  Biodiesel production from mixture of mahua and simarouba oils with high free fatty acids , 2010 .

[21]  A. M. Syam,et al.  Kinetics of the transesterification of Jatropha curcas triglyceride with an alcohol in the presence of an alkaline catalyst , 2011 .

[22]  J. Ni,et al.  Esterification of free fatty acids in sunflower oil over solid acid catalysts using batch and fixed bed-reactors , 2007 .

[23]  Mariusz Ziejewski,et al.  Diesel engine evaluation of a nonionic sunflower oil-aqueous ethanol microemulsion , 1984 .

[24]  Robiah Yunus,et al.  Methanolysis of Jatropha Oil in the Presence of Potassium Hydroxide Catalyst , 2009 .

[25]  Dora E. López,et al.  Synthesis of Biodiesel via Acid Catalysis , 2005 .

[26]  K. Pramanik.  Properties and use of jatropha curcas oil and diesel fuel blends in compression ignition engine , 2003 .

[27]  A. Drews,et al.  Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity) , 1998 .

[28]  Bouchra Benjelloun-Mlayah,et al.  Ethanolysis of rapeseed oil: Quantitation of ethyl esters, mono-, di-, and triglycerides and glycerol by high-performance size-exclusion chromatography , 1995 .

[29]  Reinaldo Giudici,et al.  Analysis of axial dispersion in an oscillatory-flow continuous reactor , 2003 .