高酸值生物柴油原料甘油酯化脱酸研究

陈英; 周东亮; 陈东; 姬彬

高酸值生物柴油原料甘油酯化脱酸研究

浙江海洋学院石油化工学院, 浙江舟山 316000

基金项目: 浙江省自然科学基金(Y12B060012); 浙江海洋学院科研启动经费; 浙江海洋学院大学生科技创新项目。

详细信息

通讯作者:
陈英, 女, 教授, 博士, 主要从事化学工程、化工环保等方面的研究。

中图分类号: TQ645
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- 被引次数: 0
出版历程
- 收稿日期: 2012-03-10
- 修回日期: 2012-05-31
- 刊出日期: 2012-12-31

Deacidification of high-acid biodiesel feedstock by esterification with glycerol

Petrochemical College, Zhejiang Ocean University, Zhoushan 316000, china

摘要

摘要: 利用共沉淀-浸渍法制备了Al改性固体酸催化剂SO₄^2-/ZrO₂,考察了催化剂在甘油酯化脱酸制备生物柴油原料反应中的催化活性、重复利用性和再生性能,并对使用前后的催化剂进行了红外光谱分析。研究表明,添加适量Al(1%,以Al₂O₃的质量分数计)不但提高了催化剂的活性,还改善了催化剂的重复利用性和再生性能。添加Al使ZrO₂上SO₄^2-的量增加,SO₄^2-结合强度增强,减少了在酯化脱酸反应过程中SO₄^2-的流失。在SO₄^2-/ZrO₂-Al₂O₃催化剂用量为7％、甘油与酸物质的量比为6:1、反应温度为140 ℃、反应时间为4 h的条件下,酯化率可达91%以上,可将高酸值油脂的酸值从31 mg_KOH/g降低到2.8 mg_KOH/g以下,可满足生物柴油原料的要求。
- 高酸值生物柴油原料 /
- 甘油酯化脱酸 /
- 固体酸催化剂
Abstract: 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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参考文献(16)

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