Method for preparing biodiesel from waste animal fat under catalysis of imidazole hydrophobic ionic liquid
A technology of ionic liquid and animal fat, applied in the field of waste resource utilization, can solve the problems of raw material pollution, many reaction raw materials, complicated process flow, etc. Effect
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Embodiment 1
[0019] Example 1: Weigh the following bio-oil, methanol, 1-ethyl-3-methylimidazolium hexafluorophosphate ([Emim]PF 6 ), placed in a transesterification reaction device, at a reaction temperature of 30°C, a reaction time of 2h, and kept stirring until the end of the reaction, wherein the moles of bio-oil, methanol, 1-ethyl-3-methylimidazolium hexafluorophosphate The ratio is 2:5:0.2; the reaction solution is put into a separatory funnel, the reaction solution is left to stand for stratification, the upper layer is biodiesel, and the lower layer is a mixed solution of ionic liquid, methanol and by-product glycerol; the biodiesel is taken out and washed with water to obtain the purity For higher biodiesel, the lower methanol and glycerol are distilled under reduced pressure, the glycerol fraction is collected at 164-200 ℃, and the glycerol is further purified to obtain refined glycerol; the ionic liquid is distilled at 90 ℃ under reduced pressure to remove impurities and dried for...
Embodiment 2
[0021] Example 2: Weigh the following bio-oil ester, methanol, 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim]BF 4 ) The ionic liquid was placed in the transesterification reaction device, and the reaction time was 1.5 h at a reaction temperature of 40 ° C, and the reaction was kept stirring until the end of the reaction. The molar ratio of the salt is 2:8:0.5; the reaction solution is put into a separatory funnel, the reaction solution is left to stand for stratification, the upper layer is biodiesel, and the lower layer is a mixed solution of ionic liquid, methanol and by-product glycerol; the biodiesel is taken out The biodiesel with higher purity is obtained by washing with water, the methanol and glycerol in the lower layer are distilled under reduced pressure, the glycerol fraction is collected at 164-200° C., and the glycerol is further purified to obtain refined glycerol. The ionic liquid was distilled at 90 °C under reduced pressure to remove impurities and then...
Embodiment 3
[0023] Example 3: Weigh the following biological oil, ethanol, 1-butyl-3-methylimidazole bis-trifluoromethanesulfonimide salt ([Bmim]Tf 2 N) The ionic liquid is placed in the transesterification reaction device, and the reaction time is 1 h at a reaction temperature of 45 ° C, and the reaction is kept stirring until the end of the reaction. The molar ratio of the methanesulfonimide salt is 2:10:0.3; the reaction solution is put into a separatory funnel, the reaction solution is left to stand for stratification, the upper layer is biodiesel, and the lower layer is a mixed solution of ionic liquid, ethanol and by-product glycerol The biodiesel is taken out and washed with water to obtain biodiesel with higher purity, the lower layer methanol and glycerol are distilled under reduced pressure, the glycerol fraction is collected at 164-200°C, and the glycerol is further purified to obtain refined glycerol. The ionic liquid was distilled at 90°C under reduced pressure to remove impu...
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