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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVING THE PERFORMANCE OF ALTERNATIVE FUELS AND CO-PRODUCTS FROM VEGETABLE OILS Title: Oxidative Stability of Biodiesel by Non-Isothermal Pressurized-Differential Scanning Calorimetry in Dynamic Mode

Author
item Dunn, Robert

Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 2006
Publication Date: April 30, 2006
Citation: Dunn, R.O. 2006. Oxidative stability of biodiesel by non-isothermal pressurized-differential scanning calorimetry in dynamic mode [abstract]. 97th American Oil Chemists' Society Annual Meeting and Expo. p. 76.

Technical Abstract: Biodiesel, an alternative diesel fuel derived from transesterification of vegetable oils or animal fats, is composed of saturated and unsaturated long-chain fatty acid alkyl esters. During long-term storage, oxidation caused by contact with air (autoxidation) presents a legitimate concern with respect to monitoring and maintaining fuel quality. Extensive oxidative degradation of unsaturated alkyl esters can compromise fuel quality by increasing kinematic viscosity, acid value or peroxide value. This study evaluates the use of pressurized-differential scanning calorimetry (PDSC) in dynamic mode as a means for determining relative resistance to oxidation of soybean oil fatty acid methyl esters (S-FAME). Kinetics of oxidation were analyzed by Ozawa-Flynn-Wall (OFW) treatment of results from non-isothermal heating scans at varying ramp rates = 1-20 deg C/min at constant cell pressure = 2000 kPa and air flowrate = 100 mL/min. Results showed that activation energy and Arrhenius pre-exponential factors from OFW analyses may be used to determine relative oxidative stability of S-FAME at any temperature.

Last Modified: 8/22/2014
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