Optimum reaction time, performance and exhaust emissions of biodiesel produced by microwave irradiation

While transesterification is well established, there remain considerable inefficiencies in existing transesterification processes. In this study an alternative energy stimulant, “microwave irradiation” was used for the production of the alternative energy source, biodiesel. The optimum parametric conditions obtained from the conventional technique were applied using microwave irradiation in order to compare both systems. The results showed that application of radio frequency microwave energy offers a fast, easy route to this valuable biofuel with advantages of enhancing the reaction rate and improving the separation process. The methodology allows for the use of high free fatty acid content feedstock, including used cooking oil; hence it helps to reduce the cost of production which constitutes a major hurdle towards widespread commercialization of biodiesel. The study also showed that the optimum reaction time for microwave-enhanced biodiesel production should be highly respected. Exceeding the optimum reaction time will lead to deterioration of both biodiesel yield and purity. This paper also reported the performance and exhaust emissions from a diesel engine when fuelled with a petroleum diesel fuel and two different biodiesel fuels; one obtained by the conventional technique and the other by microwave irradiation. It was concluded that microwave-enhanced biodiesel is not, at least, inferior to that produced by the conventional technique.

[1]  Sarah Schmitz,et al.  Microwave-assisted polymer chemistry: Heck-reaction, transesterification, Baeyer-Villiger oxidation, oxazoline polymerization, acrylamides, and porous materials , 2006 .

[2]  Breda Kegl,et al.  Effects of biodiesel on emissions of a bus diesel engine. , 2008, Bioresource technology.

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

[4]  S. Jayaraj,et al.  Performance and emission evaluation of a diesel engine fueled with methyl esters of rubber seed oil , 2005 .

[5]  Magín Lapuerta,et al.  Diesel particulate emissions from used cooking oil biodiesel. , 2008, Bioresource technology.

[6]  J. V. Gerpen,et al.  Biodiesel processing and production , 2005 .

[7]  Benjamin A. Wilhite,et al.  CONTINUOUS-FLOW PREPARATION OF BIODIESEL USING MICROWAVE HEATING , 2007 .

[8]  Vittorio Rocco,et al.  Brassica carinata as an alternative oil crop for the production of biodiesel in Italy: engine performance and regulated and unregulated exhaust emissions. , 2002, Environmental science & technology.

[9]  Mustafa Ertunc Tat,et al.  Fuel property effects on injection timing, ignition timing, and oxides of nitrogen emissions from biodiesel-fueled engines , 2007 .

[10]  D. Boocock,et al.  Ethyl esters from the single-phase base-catalyzed ethanolysis of vegetable oils , 2003 .

[11]  Giovanni Modica,et al.  Fatty acid methyl esters synthesis from triglycerides over heterogeneous catalysts in the presence of microwaves , 2004 .

[12]  A. Breccia,et al.  Chemistry by microwaves , 1999 .

[13]  M. P. Dorado,et al.  EXHAUST EMISSIONS FROM A DIESEL ENGINE FUELED WITH TRANSESTERIFIED WASTE OLIVE OIL , 2003 .

[14]  R. Murray.  The Teaching Assistant , 1996 .

[15]  Nazım Usta,et al.  Use of tobacco seed oil methyl ester in a turbocharged indirect injection diesel engine , 2005 .

[16]  J. Encinar,et al.  Biodiesel from Used Frying Oil. Variables Affecting the Yields and Characteristics of the Biodiesel , 2005 .

[17]  Avinash Kumar Agarwal,et al.  Performance and emissions characteristics of Jatropha oil (preheated and blends) in a direct injection compression ignition engine , 2007 .

[18]  J. V. Gerpen,et al.  Process Optimization of Biodiesel Production Using Alkaline Catalysts , 2006 .

[19]  S. T. El Sheltawy,et al.  Production optimization and quality assessment of biodiesel from waste vegetable oil , 2008 .

[20]  J. Gómezc,et al.  Exhaust emissions from a Diesel engine fueled with transesterified waste olive oil q , 2003 .

[21]  Pavan Kumar Meka,et al.  Synthesis of biodiesel fuel from safflower oil using various reaction parameters. , 2006, Journal of oleo science.

[22]  Gökhan Zengin,et al.  Performance and emission study of biodiesel from leather industry pre-fleshings. , 2007, Waste management.

[23]  K. Chua,et al.  PRODUCTION OF ETHYL ESTER (BIODIESEL) FROM USED FRYING OIL: OPTIMIZATION OF TRANSESTERIFICATION PROCESS USING MICROWAVE IRRADIATION , 2004 .

[24]  B. Brian He,et al.  PROCESS OPTIMIZATION OF BIODIESEL PRODUCTION USING DIFFERENT ALKALINE CATALYSTS , 2006 .

[25]  Rajender S. Varma,et al.  Solvent-free accelerated organic syntheses using microwaves , 2001 .

[26]  Nicholas E. Leadbeater,et al.  Fast, Easy Preparation of Biodiesel Using Microwave Heating , 2006 .

[27]  J. Tierney,et al.  Microwave assisted organic synthesis-a review , 2001 .

[28]  U. Schuchardt,et al.  Transesterification of vegetable oils: a review , 1998 .

[29]  M. P. Dorado,et al.  Testing Waste Olive Oil Methyl Ester as a Fuel in a Diesel Engine , 2003 .

[30]  B. Kegl.  Experimental Investigation of Optimal Timing of the Diesel Engine Injection Pump Using Biodiesel Fuel , 2006 .

[31]  José Luis Míguez,et al.  Performance and exhaust emissions in the use of biodiesel in outboard diesel engines , 2007 .

[32]  J. Hernando,et al.  Biodiesel and FAME synthesis assisted by microwaves: Homogeneous batch and flow processes , 2007 .

[33]  José M. Encinar,et al.  Ethanolysis of used frying oil. Biodiesel preparation and characterization , 2007 .