Measuring Reaction and Separation

摘要

The quality of biodiesel is critical to reliable performance and acceptance in the market. ASTM international establishes standards by which biodiesel fuel quality is evaluated. These standards are defined by the ASTM Standard Specification D6751. listed among the 21 specifications in D6751 is standard method D6584, Test Method for Determination of Total Monoglycerides, Total Diglycerides, Total Triglycerides, and Tree and Total Glycerin in B-100 Biodiesel Methyl Esters by Gas Chromatography. This referee test method is used to evaluate the extent of reaction from feedstock (e.g., triglycerides) to biodiesel (i.e., methyl esters) as well as the separation of free glycerin from the finished product. Proper application of D6584 is even more important now that it serves in part to distinguish the new No. 1-B grade biodiesel classification by identifjing and quantifying total monoglycer-ide content. For the biodiesel producer trying to optimize plant production and qualify inventory for valid RINs, correct measurement of firee and total glycerin is vital.