Ferric Sulphate Catalyzed Esterification of High Free Fatty Acids Content Waste Coconut Oil for Biodiesel Synthesis
Ferric Sulphate Catalyzed Esterification of High Free Fatty Acids Content Waste Coconut Oil for Biodiesel Synthesis
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硫酸铁催化高游离脂肪酸含量废椰子油酯化合成生物柴油
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发表时间：
2014
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影响因子：
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通讯作者：
Wayne Mitzner
中科院分区：
文献类型：
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作者：
Wayne Mitzner
具有高游离脂肪酸（FFAs）含量的原料可以成功地用于生物柴油的合成，一旦高游离脂肪酸含量降低到所需的水平。本研究在不同催化剂用量和甲醇油摩尔比下，考察了硫酸铁作为固体酸催化剂在废椰子油中游离脂肪酸酯化反应中的适用性。在甲醇：油比分别为3.81:1、5.72:1和7.63:1，反应温度为60℃时，采用1.25、2.5、3.75和5.0% w/w的油基Fe2(SO4)3， FFA随着催化剂和甲醇：油摩尔比的增加而减少，达到酯化平衡所需时间减少。在Fe2(SO4)3催化剂用量为3.75% w/w、甲醇：油摩尔比为7.63:1、反应温度为60℃的条件下，酯化反应时间为36.94 min，最终油上FFA浓度为2.00% w/w，进行反式酯化反应。在考虑反应周期结束时，固体Fe2(SO4)3催化剂可以从反应体系中分离出来。
Feedstock with high free fatty acids (FFAs) content can be successfully employed for biodiesel synthesis once the high FFA content is reduced to the desired levels. In the present study, the applicability of ferric sulphate as the solid acid catalyst for esterification of FFA in waste coconut oil was evaluated at varying catalyst dosage and methanol:oil molar ratios. 1.25, 2.5, 3.75 and 5.0% w/w Fe2(SO4)3 on oil basis was used at methanol:oil ratios of 3.81:1, 5.72:1 and 7.63:1 and at the reaction temperature of 60 C. The FFA reduced more with the increase in catalyst and methanol:oil molar ratios while the time requirement to reach the esterification equilibrium reduced. Final FFA level of 2.00% w/w on oil can be achieved by esterification at a reaction period of 36.94 minutes in the presence of 3.75% w/w of Fe2(SO4)3 catalyst dosage at 7.63:1 methanol:oil molara ratio and 60 C reaction temperature, which then can be subjected for trans-esterification process. At the end of the considering reaction period the solid Fe2(SO4)3 catalyst could be separated from the reaction system.