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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: Biodiesel Fuel Quality and the ASTM Biodiesel Standard

Author
item KNOTHE, GERHARD

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: September 22, 2009
Publication Date: September 22, 2009
Citation: Knothe, G.H. 2009. Biodiesel Fuel Quality and the ASTM Biodiesel Standard [abstract]. 16th International Oil Palm Conference and Expo, Cartagena, Columbia.

Technical Abstract: Biodiesel is usually produced from vegetable oils, animal fats and used cooking oils with alternative feedstocks such as algae receiving increasing interest. The transesterification reaction which produces biodiesel also produces glycerol and proceeds stepwise via mono- and diacylglycerol intermediates. As a result, small amounts of glycerol, lipid starting material, and intermediates may remain in the final biodiesel product even after purification. Depending on the feedstock, other materials originally contained in a feedstock may carry over into biodiesel. The fatty acid profile of a biodiesel fuel corresponds to that of its feedstock. Due to the variety of feedstocks with different fatty acid profiles this results in different properties of the fuel. The overall quality of a biodiesel fuel is affected by all of these issues. Therefore, these issues are addressed by various specifications in the American Society for Testing and Materials (ASTM) as well as other biodiesel standards. The ASTM standards has also received numerous updates over time. The various specifications in the ASTM standard as well as some differences to other standards will be briefly discussed.

Last Modified: 8/27/2014
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