Preparation of biodiesel by ultrasonic assisted esterification of Tall oil fatty acid over solid acid catalyst
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摘要: 将强酸性阳离子交换树脂加入塔尔油脂肪酸和甲醇混合液中，并在超声波辐射辅助下得到生物柴油，对生物柴油的制备工艺和性能进行研究，同时建立动力学模型。结果表明,超声波辐射的辅助强化，能有效提高生物柴油的得率；在反应温度65℃、反应时间1h、甲醇与TOFA摩尔比为10∶1、脱水剂用量为TOFA6%、树脂NKC-9用量为TOFA40%的最佳工艺条件下，反应平衡常数可达11.18，生物柴油得率为90.0%。建立的动力学模型补充了超声波辐射辅助酯化反应动力学参数，并用此模型解释了各工艺参数呈现的规律。以廉价的制浆黑液回收物塔尔油脂肪酸为原料制备生物柴油，能有效地降低生物柴油价格，提高其市场竞争力，实现塔尔油高附加值利用，具有良好的发展前景。Abstract: Biodiesel was prepared by the esterification of Tall oil fatty acid (TOFA) with methanol over the cation exchange resin solid acid catalyst under the assistance of ultrasonic. The preparation process and the characteristic of the biodiesel obtained were investigated; a kinetic model was built. The results showed that the ultrasonic irradiation can effectively improve the yield of biodiesel. The optimum processing condition is 65℃, reaction time of 1h, mol ratio of methanol/TOFA being 10, dehydrating agent quantity of 6% (based on TOFA) and catalyst amount of 40% (based on TOFA); under such a condition, the biodiesel yield reaches 90.0%. The kinetic parameters for the ultrasonic assisted esterification are obtained, which can well explain process regulation. Current process is economical to prepare biodiesel on the market, because cheap TOFA from black liquor is used as the raw material; it may provide a potential way to efficiently utilize TOFA.
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Key words:
- biodiesel /
- tall oil fatty acid /
- cation-exchange resin /
- ultrasonic /
- kinetics
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