Modification of thermal and oxidative properties of biodiesel produced from vegetable oils

Trans esterification of three vegetable oils, sunflower oil, linseed oil and mixed oils as; sunflower-soyabean and olein were carried out using methanol, and potasium hydroxide as catalyst. The methyl esters of the corresponding oils were separated from the crude glycerol and characterized by physical-chemical methods to evaluate their thermal properties. This methods are determination of densities, cloud points, pour points, flash points, kinematic viscosities, hydrogen/carbon ratios, sulfur contents, ash contents and triglycerides. The physico-chemical characteristic of biodiesel treated with ozone showed improvement of pour point and flash point indicating higher degree of safety for fuel. Methyl esters mixed with their corresponding ozonated oil were subjected to comparison and evaluation for their thermal properties by the thermo gravimetric analysis differential thermal analysis from which the calculated heat of enthalpy and comparison with the heat of conventional diesel. The results showed that the oxygen content of biodiesel samples treated with ozone increased weight % and resulted in more extensive chemical reaction, promoted combustion characteristics and less carbon residue was produced. Gas chromatography appeared more suitable to address the problem of determining/verifying biodiesel methyl ester and showed that methyl ester content was impurity free. Ultra violet-detection was used for rapid quantization of triglycerols. From the analyses performed biodiesel treated with ozone modified the thermal and oxidative stability shown by the high combustion efficiency indicated by the high heat of enthalpy and reducing the emission of particulate matter.

[1]  G. Knothe,et al.  Kinematic viscosity of biodiesel fuel components and related compounds. Influence of compound structure and comparison to petrodiesel fuel components , 2005 .

[2]  Mahesh G. Nagarkatti,et al.  Ozone in Water Treatment: Application and Engineering , 1991 .

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

[4]  Martin Mittelbach,et al.  Diesel fuel derived from vegetable oils, VI: Specifications and quality control of biodiesel , 1996 .

[5]  M. Dubé,et al.  Biodiesel production from waste cooking oil: 1. Process design and technological assessment. , 2003, Bioresource technology.

[6]  F. Silva,et al.  Thermoanalytical characterization of castor oil biodiesel , 2007 .

[7]  J. Hoigne,et al.  Rate constants of reactions of ozone with organic and inorganic compounds in water—I. Non-dissociating organic compounds , 1983 .

[8]  Ghassan Tashtoush,et al.  Experimental study on evaluation and optimization of conversion of waste animal fat into biodiesel. , 2004 .

[9]  Yogesh Chandra Sharma,et al.  Development of biodiesel from karanja, a tree found in rural India , 2008 .

[10]  A. Demirbas,et al.  Biodiesel fuels from vegetable oils via catalytic and non-catalytic supercritical alcohol transesterifications and other methods: a survey , 2003 .

[11]  M. Sharma,et al.  Jatropha-Palm biodiesel blends: An optimum mix for Asia , 2007 .

[12]  Nestor U. Soriano,et al.  Ozonized vegetable oil as pour point depressant for neat biodiesel , 2006 .

[13]  N. Alper Tapan,et al.  ESTERIFICATION OF FREE FATTY ACIDS IN WASTE COOKING OILS (WCO): ROLE OF ION EXCHANGE RESINS , 2008 .

[14]  K. Lo,et al.  Waste vegetable oil as a diesel fuel extender , 1987 .

[15]  K. B. Cigizogu,et al.  Used Sunflower Oil as an Alternative Fuel for Diesel Engines , 1997 .

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

[17]  Peter Tritthart,et al.  Diesel fuel derived from vegetable oils, III. Emission tests using methyl esters of used frying oil , 1988 .

[18]  J. H. Van Gerpen,et al.  A pilot plant to produce biodiesel from high free fatty acid feedstocks. , 2003 .

[19]  David A. Reckhow,et al.  Ozone in Water Treatment , 1991 .

[20]  Jesus Santamaria,et al.  Biodiesel from sunflower oil by using activated calcium oxide , 2007 .

[21]  Mustafa Canakci,et al.  The potential of restaurant waste lipids as biodiesel feedstocks. , 2007, Bioresource technology.

[22]  V. Makarevičienė,et al.  Influence of fuel oxygen content on diesel engine exhaust emissions , 2006 .

[23]  N. H. Jayadas,et al.  COCONUT OIL AS BASE OIL FOR INDUSTRIAL LUBRICANTS – EVALUATION AND MODIFICATION OF THERMAL, OXIDATIVE AND LOW TEMPERATURE PROPERTIES , 2006 .

[24]  D. Leung,et al.  Transesterification of neat and used frying oil : Optimization for biodiesel production , 2006 .

[25]  Vegetable oil as diesel fuel? , 1980 .

[26]  I. Buzás,et al.  Effect of the experimental conditions on the thermooxidative behaviour of vegetable oils , 1977 .

[27]  A. S. Ramadhas,et al.  Biodiesel production from high FFA rubber seed oil , 2005 .

[28]  Yong Wang,et al.  Preparation of biodiesel from waste cooking oil via two-step catalyzed process. , 2007 .

[29]  G. Knothe.  Analytical methods used in the production and fuel quality assessment of biodiesel. , 2001 .

[30]  A. Phan,et al.  Biodiesel production from waste cooking oils , 2008 .