Cold flow properties winterization

Cold flow properties are of major importance in winter diesel. Cold performance limits are set to guarantee lack of crystallization. These are expressed as Cloud Point (CP), Pour Point (PP), or as Cold Filter Plugging Point (CFPP). For B100 biodiesel these have to be fully met with the biodiesel, and, if needed, with extra crystal retardation additives. In B2-B30 blends, though, the tendency is rather towards two types of Biodiesel, one for summertime (for example with CFPP of 0°C), and one for wintertime (for example with CFPP -10 °C). 

Perez, A., Casas, A., et al., 2010. Winterization of peanut biodiesel to improve the cold flow properties. Bioresource Technology 101 (19), 7375—7381. 

Gonz lez G6mez, M. E., Howard-Hildige, R., Leahy, J. J., and Rice, B. 2002. Winterization of Waste Cooking Oil Methyl Ester to Improve Cold Flow Temperature Fuel Properties. Fuel, 81,33-39. 

Another property determined by the magnitude of intermolecular forces in a liquid is viscosity. Viscosity, with units of N s/m, is a measure of a fluid s resistance to flow. The higher the viscosity, the more slowly a liquid flows. The viscosity of a liquid typically decreases with increasing temperature. The phrase slow as molasses in winter refers to the fact that molasses pours more slowly (has a higher viscosity) in cold weather. You may also have noticed that honey and maple syrup seem thinner when they are heated. 

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