452 / 2018-09-04 14:50:00

Catlytic Esterfication Preparation And Kinetics of Isobutyl Palmitate And its Cold Flow Properties

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The synthesis of Isobutyl palmitate by the esterification of palmitic acid and isobutanol with pyridine n-butyl bisulfate ionic liquid as catalyst in a self-designed reactor and dynamic analysis of the esterification and the low temperature fluidity of biodiesel were studied. The results showed that the optimal reaction conditions were obtained as follows: catalyst dosage 6%, reaction time 60 min, molar ratio of isobutanol to palmitic acid 5:1 and reaction temperature 100 ℃. The verification test was conducted under the optimal conditions and the conversion rate was up to 98.79%. The kinetics of catalytic esterification was analyzed. The reaction series was 1.49, The activation energy E_a was 57.38 KJ⋅mol^(-1), The frequency factor A was 2.70×〖10〗^7and reaction kinetics model was (-dc_A)⁄dt=2.70×〖10〗^7 e^(-57.38/RT) c_A^1.49.The solidifying point, the cold filter plugging point and kinematic viscosity of Isobutyl palmitate obtained were 3 ℃, 7 ℃ and 4.93 mm^2⋅s^(-1), respectively. Compared with methyl palmitate, the solidifying point decreased by 6 times, the cold filter plugging point decreased by 3.28 times. Therefore, the use of branched-chain alcohol instead of methanol ester exchange descaling method can effectively reduce the solidifying point and the cold filter plugging point of biodiesel to improve the low temperature performance of biodiesel.