Citation: CHEN Ying, ZHOU Dong-liang, CHEN Dong, JI Bin. Deacidification of high-acid biodiesel feedstock by esterification with glycerol[J]. Journal of Fuel Chemistry and Technology, ;2012, 40(12): 1429-1434. shu

Deacidification of high-acid biodiesel feedstock by esterification with glycerol

1.
Petrochemical College, Zhejiang Ocean University, Zhoushan 316000, china

Corresponding author: CHEN Ying,
Received Date: 10 March 2012
Available Online: 31 May 2012
Fund Project: 浙江省自然科学基金(Y12B060012) (Y12B060012)

Solid acid catalyst SO₄^2-/ZrO₂ modified by doping Al was prepared by co-precipitation-impregnation method and characterized by infrared spectrum. The activities of fresh, reused and regenerated catalysts were investigated by esterification with glycerol for deacidification of high-acid biodiesel feedstock. The activity of the catalyst SO₄^2-/ZrO₂ modified by 1% Al₂O₃, whatever the catalyst was in fresh or reused or regenerated condition, was better than that of non-modified SO₄^2-/ZrO₂. Al can increase the amount of SO₄^2- on the catalyst, strengthen the combination between S and O, and decrease the loss of SO₄^2- in the esterification process. The conversion of esterification was above 91% under the conditions of atmospheric pressure, 140 ℃ for 4 h, glycerol and fatty acid mole ratio of 6, and SO₄^2-/ZrO₂-Al₂O₃ catalyst dosage (catalyst/oil) of 7%.The acid value of the oil was reduced from 31 mg_KOH/g to 2.8 mg_KOH/g after esterification under above optimum conditions. This low-acid oil is suitable as the raw material of biodiesel.
- high-acid biodiesel feedstock,
- deacidification by esterification with glycerol,
- solid acid catalyst
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