Investigation of the Castor Oil and Its Methylester in Methanol-Gasoline As Dual-Functional Additives

In this work, the castor oil and its methyl, as additives, have been studied under the conditions of the phase separation temperature of M15, M30, M50, M65 and M85 methanol gasoline at the temperature range from -25.0°C to 40.0°C, respectively. The influence of the additives on the phase stability and saturation vapor pressure of methanol gasoline was discussed. It turns out that, castor oil and its methyl derivatives, especially methyl castor oil, have good phase stability when be used for different ratio methanol gasoline blends. Introducing that more methyl castor oil will be needed to get homogeneous in water-methanol gasoline blends system. In addition, the castor oil and its methyl derivates can decrease the saturation vapour pressure of methanol gasoline effectively as well.