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Determining the Influence of Contaminants on Biodiesel Properties
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Abstract
The methyl esters of vegetable oils and animal fats, known as biodiesel, are receiving increasing attention as an alternative fuel for diesel engines. Although the production of biodiesel involves a relatively simple chemical process, there is potential for various contaminants to be present in the fuel. These contaminants include water, free glycerin, bound glycerin, alcohol, free fatty acids, soaps, catalyst, unsaponifiable matter and the products of oxidation. As interest in this fuel grows, quality standards and specifications are being developed. These standards place limits on the amounts of contaminants that may be present in biodiesel. The objective of this project was to develop a database of property data to provide a basis for setting realistic specification values for biodiesel. Small amounts of these various contaminants were added to biodresel and their impact on the properties and performance of the biodiesel was measured. The results generally support the levels given in a standard proposed by the National Biodiesel Board that is currently being considered by the American Society for Testing and Materials. However, the study identifies water contamination, bound glycerin, and oxidation as three areas of concern. Biodiesel can absorb up to 40 times more water than conventional diesel fuel. High levels of bound glycerin can cause crystallization and increased viscosity. Oxidation can produce chemical compounds that improve cetane number but also increase the acidity of the fuel. These areas need additional research.
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Van Gerpen, J., Hammond, E., Yu, L., and Monyem, A., "Determining the Influence of Contaminants on Biodiesel Properties," SAE Technical Paper 971685, 1997, https://doi.org/10.4271/971685.Also In
References
- Chesneau, H.L. “Fuel System Contaminants: An Introduction,” Distillate Fuel: Contamination, Storage and Handling Chesneau H.L. Dorris M.M. ASTM publication STP 1005 American Society for Testing and Materials Philadelphia, PA 1988
- Garrett, T.K. Automotive Fuels and Fuel Systems 2 Diesel, Society of Automotive Engineers Warrendale, PA 1994
- Drown, D.C. Vice President of Technology Development Idaho Transtech, Inc. May 23 1996
- Engler, C.R. Johnson L.A. Lepori W.A. Jegasothy H. Reddy M.B. Yarbrough C.M. “Partial lnteresterification of Plant Oils,” Food Protein R&D Center Department of Agricultural Engineering Texas A&M University October 1983
- Barsic, N.J. Humke A.L. “Performance and Emissions Characteristics of a Naturally Aspirated Diesel Engine with Vegetable Oil Fuels,” Society of Automotive Engineers Paper No. 810262 SAE Warrendale, PA 1981
- Chemical Rubber Co. Handbook of Chemistry and Physics 51 1970-1971 C-313
- Reddy, S. Y. Prabhakar, J. V. “Study on the polymorphism of normal triglycerides of Sal fat by DSC - I. Effect of diglycerides,” JAOCS 63 672 1986
- Cebula, D. J. Smith, K. W. “Differential scanning calorimeter of confectionery Eats: Part I1 - Effects of blends and minor components,” JAOCS 69 992 1992
- Howell, S. Research Director for the National Biodiesel Board personal communication June 1996
- Bailey, A.E. 1945 Industrial Oil and Fat Products Interscience New York
- Ortech International 1995 Operation of Cummins N 14 Diesel on Biodiesel: Performance, Emissions, and Durability Final report to the National Biodiesel Board Ortech Report No. 95-E11-B004524 December 20
- Liotta, F.J., Jr. “A Peroxide Based Cetane Improvement Additive with Favorable Blending Properties,” SAE Paper No. 932767 1993