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| Preparation of biodiesel antioxidant iso-amyl gallate and its antioxidant activity |
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| KeyWord:biodiesel antioxidant iso-amyl gallate ionic liquid catalytic esterification antioxidant activity |
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| Abstract: |
| With morphine and 1-bromobutane as reactants， the n-butyl morpholinium hydrogen sulfate（\[Hnhm\]HSO4） ionic liquid was prepared firstly. The esterification of gallic acid and isoamyl alcohol to synthesize iso-amyl gallate was catalyzed by the ionic liquid. The reaction conditions of synthesis of iso-amyl gallate were optimized by single factor experiment and orthogonal experiment. The results showed that the sequence of the factors influencing the esterification yield from high to low was：reaction temperature， reaction time， molar ratio of isoamyl alcohol to gallic acid， dosage of catalyst. The optimal reaction conditions were obtained as follows：reaction temperature 80?℃， molar ratio of isoamyl alcohol to gallic acid 30∶?1， reaction time 50 min and dosage of catalyst 6%. Under these conditions， the esterification yield was 97.45%. The kinetics of esterification was analyzed and the activation energy and kinetic model were 4.91 kJ/mol and-dCAdt=5.22e-4.91RTC0.843A respectively. The antioxidant effects of iso-amyl gallate on eight kinds of biodiesels were excellent. The oxidative stability of Jatropha biodiesel could meet the national standard requirment when the dosage of iso-amyl gallate was 600 mg/kg. |
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