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Optimization of ester structure of biodiesel and its influence on low temperature fluidity
  
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KeyWord:biodiesel  isoamyl stearate  ionic liquid  catalytic preparation  low-temperature fluidity
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WANG Wenchao, LI Fashe, LI Ying  
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Abstract:
      In the self-designed reaction device, isoamyl stearate was produced by stearic acid and isoamyl alcohol using pyridine bisulfate ionic liquid as catalyst, and the low-temperature fluidity was studied. The results showed that the optimal reaction conditions were obtained as follows: molar ratio of isoamyl alcohol to stearic acid 7∶?1, reaction time 30 min, catalyst dosage 7% and reaction temperature 90?℃. Under these conditions, the conversion rate was 98.34%. The freezing point, cold filter point and the kinematic viscosity of isoamyl stearate were 9, 13?℃ and 3.55 mm2/s, respectively. Compared with methyl stearate, the freezing point decreased by 22?℃, the cold filter point decreased by 20?℃, and the kinematic viscosity decreased by 40.44%. Therefore, using isoamyl alcohol instead methanol could effectively reduce the freezing point and cold filter point and improve the low-temperature fluidity of biodiesel.
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