Effect of additives to supercritical methyl acetate on biodiesel production
Effect of additives to supercritical methyl acetate on biodiesel production
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DOI：
10.1016/j.fuproc.2014.03.035
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发表时间：
2014-09
影响因子：
7.5
通讯作者：
F. Goembira;S. Saka
中科院分区：
文献类型：
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作者：
F. Goembira;S. Saka
超临界乙酸甲酯已被证明可将甘油三酯转化为脂肪酸甲酯（FAME）和三醋精。由于超临界乙酸甲酯对甘油三酯的反应性较低，需要350 °C/20 MPa/45 min的反应条件以获得96.7 wt.%的最高收率FAME和8.8重量%三醋精（总量105.5重量%）。然而，在这样的条件下，产物的热分解是不可避免的，因此，难以实现进一步的产率增加。因此，本研究是为了了解添加剂在提高超临界过程的反应速率方面的可能用途。评价油酸、乙酸、甲醇和水作为添加剂。发现乙酸和水的加入改善了超临界乙酸甲酯法的性能。令人惊讶的是，当两种添加剂同时作为乙酸水溶液使用时，在较低的反应温度下可获得较高的产率。添加10重量%乙酸水溶液（25重量%在300 °C/20 MPa/45 min下，在100 ° C下，在100 MPa下，在100 ° C下，在100 °FAME和12.9重量%三醋精（总量109.7重量%），因此，它被认为是超临界醋酸甲酯法制备生物柴油的潜在添加剂。
Supercritical methyl acetate has been proven to convert triglycerides into fatty acid methyl esters (FAMEs) and triacetin. Due to the low reactivity of supercritical methyl acetate on triglycerides, reaction condition of 350 °C/20 MPa/45 min is needed to obtain the highest yield of 96.7 wt.% FAME and 8.8 wt.% triacetin (total 105.5 wt.%). Yet, under such condition, thermal decomposition of products is inevitable, thus, further yield increments are hard to attain. This study was, therefore, done to know the possible use of additives in increasing the reaction rate of the supercritical process. Oleic acid, acetic acid, methanol and water were evaluated as additives. It was discovered that acetic acid and water additions improved the performance of supercritical methyl acetate method. Surprisingly, when both additives were used simultaneously as aqueous acetic acid, the higher yield was obtainable at a lower reaction temperature. The addition of 10 wt.% aqueous acetic acid (25 wt.% concentration) at 300 °C/20 MPa/45 min yielded 96.8 wt.% FAME and 12.9 wt.% triacetin (total 109.7 wt.%), thus, it is considered as a potential additive in biodiesel production by supercritical methyl acetate method.