The Kinetics of the Esterification of Free Fatty Acids in Waste Cooking Oil Using Fe2(SO4)3/C Catalyst

Abstract

Abstract: The esterification of free fatty acids(FFA) in waste cooking oil with methanol in the presence of Fe₂(SO₄)₃/C(ferric sulfate/active carbon) catalyst was studied.The effects of different temperature, methanol/FFA mole ratio and amount of catalyst on the conversion of FFA were investigated.The results demonstrated that under optimal esterification conditions the final acid value of the resultant system can be reduced to ～1(mg KOH)·g^-1, which met fully the requirements in post-treatment for efficient separation of glycerin and biodiesel.The kinetics of the esterification were also investigated under different temperatures.The results indicated that the rate-control step could be attributed to the surface reaction and the esterification processes can be well-depicted by the as-calculated kinetic formula in the range of the experimental conditions.

Key words: biodiesel, kinetics, esterification, free fatty acids, waste cooking oil

摘要： The esterification of free fatty acids(FFA) in waste cooking oil with methanol in the presence of Fe₂(SO₄)₃/C(ferric sulfate/active carbon) catalyst was studied.The effects of different temperature,methanol/FFA mole ratio and amount of catalyst on the conversion of FFA were investigated.The results demonstrated that under optimal esterification conditions the final acid value of the resultant system can be reduced to ～1(mg KOH)·g^-1,which met fully the requirements in post-treatment for efficient separation of glycerin and biodiesel.The kinetics of the esterification were also investigated under different temperatures.The results indicated that the rate-control step could be attributed to the surface reaction and the esterification processes can be well-depicted by the as-calculated kinetic formula in the range of the experimental conditions.

关键词: biodiesel, kinetics, esterification, free fatty acids, waste cooking oil

GAN Mengyu, PAN Deng, MA Li, YUE En, HONG Jianbing. The Kinetics of the Esterification of Free Fatty Acids in Waste Cooking Oil Using Fe₂(SO₄)₃/C Catalyst[J]. , 2009, 17(1): 83-87.

甘孟瑜, 潘登, 马利, 岳恩, 洪建兵. The Kinetics of the Esterification of Free Fatty Acids in Waste Cooking Oil Using Fe₂(SO₄)₃/C Catalyst[J]. , 2009, 17(1): 83-87.

References

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The Kinetics of the Esterification of Free Fatty Acids in Waste Cooking Oil Using Fe₂(SO₄)₃/C Catalyst

The Kinetics of the Esterification of Free Fatty Acids in Waste Cooking Oil Using Fe₂(SO₄)₃/C Catalyst

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