Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: April 28, 2000
Publication Date: N/A
Technical Abstract: Biodiesel is defined as the mono-alkyl esters of a vegetable oil or animal fat. Thus many parameters used in fatty acid chemistry have been applied to biodiesel. Even the iodine value has been applied to biodiesel, and it has been included in some biodiesel standards. The iodine value has been related to various biodiesel fuel properties including cold flow, oxidative stability, and formation of engine deposits. However, the use of the iodine value suffers from several significant disadvantages, which are related to its unsatisfactory specificity in taking fatty acid structure and composition of mixtures into account. Some straightforward mathematical examples are used to underline this observation. Furthermore, results from oxidative stability studies are applied to the iodine value. It appears that a modified index can be developed which would take fatty acid structure and composition of mixtures into account. The development of such an index could have implications for the use of the iodine value in fatty acid chemistry in general.