369 / 2018-11-24 14:33:15

Kinetic Analysis of Branched Esters of Palmitic Acid and Distribution of their Cold Flow Properties

Palmitic acid ester; ionic liquid; kinetic analysis; integral method; low temperature fluidity

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Palmitic acid ester derivatives were synthesized using pyridine n-butyl bisulfate ionic liquid as the catalyst in a self-designed reactor, and the kinetic analysis of the esterification and the low temperature fluidity of the resulting palmitic acid esters were investigated. The esterification rate was up to 97% under the conditions of reaction temperature, reaction time, molar ratio of alkyd and catalyst dosage. The kinetic analysis of methyl palmitate, isopropyl palmitate, isobutyl palmitate, and isoamyl palmitate was carried out by the integral method. The reaction kinetic parameters, reaction order, and activation energy of the esterification reaction were determined. Compared to methyl palmitate, the kinematic viscosity of the branched chain palmitic acid esters was slightly higher, and the freezing point and cold filter point decreased with increasing degree of branching. The difference in low-temperature flow properties of the branched esters is mainly related to the mutual attraction and intermolecular forces between the first group electrons. Therefore, the use of branched chain alcohol instead of methanol ester exchange descaling method can effectively reduce the pour point and cold filter point of biodiesel to improve the low-temperature performance of biodiesel.