Biodiesel/petrodiesel blends properties

TABLE 1.4. Cold flow properties of biodiesel/petrodiesel blends."... 

The biodiesel can be used alone or blended, as B20 in 20wt% with petrodiesel. As shown in Table 14.2, the biodiesel has remarkable combustion properties reflected in a drastic reduction of all emissions, excepting for a small increase in NO. Over a life cycle the C02 reduction is about 65% [13]. 

Nearly linear correlations for CFPP versus CP and LTFT versus CP were reported for neat biodiesel and its blends with petrodiesel (Dunn and Bagby, 1995,1996 Dunn et al., 1996). For LTFT, the correlation was essentially LIFT CP, suggesting the labor- and time-intensive LTFT test could be spared by simply measuring CP. A major conclusion from these studies was that development of approaches to improve cold flow properties of biodiesel should focus on technologies that decrease CP. 

Many approaches for improving the cold flow properties of biodiesel have been explored. These include blending with petrodiesel, transesterification with medium or branched-chain alcohols instead of methanol or ethanol, crystallization fractionation, and treatment with cold flow improver (CFI) additives. 

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