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Evaluation of continuous ethyl ester synthesis from acid soybean oil using a dual immobilized enzyme system
Biomass & Bioenergy ( IF 6 ) Pub Date : 2020-12-11 , DOI: 10.1016/j.biombioe.2020.105898
Mariana S. de Paula , Larissa F.C. de Oliveira , Fernanda T. Cunha , Thiago P.C. Gomes , Pedro Ivo N.M. Pereira , Marta A.P. Langone

The use of non-edible oils, waste oils, and animal fats have been investigated as a low-cost feedstock for biodiesel (fatty acid alkyl esters) synthesis. However, these alternative raw materials have some drawbacks due to the high content of free fatty acid (FFA). This work aimed to study the continuous enzymatic ethyl esters synthesis, in a solvent-free system, from the reaction of acid soybean oil (acid value, AV, of 0.5, 8.5, 50, and 90) and ethanol using a dual commercial immobilized lipase system (Novozym 435®, Lipozyme TL IM®, Lipozyme RM IM®). Initially, a dual lipase system was used in a single packed-bed reactor (PBR). The blend of Lipozyme TL IM and Novozym 435 had a positive synergistic effect on biodiesel synthesis: an increase of 76% in ethyl ester content was observed after 2 h using refined soybean oil. However, a reduction in the yield was observed in longer reaction times (25 h). Therefore, a continuous reaction system, operated with two different catalytic beds, was investigated. The use of two series reactors allowed high ethyl ester yield (>90%) and high acid conversion (>90%). The reaction using acid soybean oil (50 AV), and Lipozyme RM IM and Novozym 435 reached an ethyl ester content of 95% and 70% after 2 and 25 h, respectively. The results showed that using two different commercial immobilized lipases in intercalated packed-bed reactors enhanced biodiesel synthesis from acid soybean oil. The enzymatic system allows a high fatty acid conversion present in the acidic oil into ethyl ester.



中文翻译:

使用双重固定酶系统评估酸性大豆油中连续乙酯的连续合成

已经研究了使用非食用油,废油和动物脂肪作为生物柴油(脂肪酸烷基酯)合成的低成本原料。但是,这些替代原料由于游离脂肪酸(FFA)含量高而具有一些缺点。这项工作旨在研究在无溶剂系统中使用双市售固定化脂肪酶由酸性大豆油(酸值,AV分别为0.5、8.5、50和90)与乙醇反应连续进行酶促乙酯合成的方法。系统(Novozym435®,Lipozyme TLIM®,Lipozyme RMIM®)。最初,在单填充床反应器(PBR)中使用双脂酶系统。Lipozyme TL IM和Novozym 435的共混物对生物柴油合成具有积极的协同作用:使用精制大豆油2小时后,乙基酯含量增加了76%。然而,在较长的反应时间(25小时)中观察到产率降低。因此,研究了在两个不同的催化床下运行的连续反应系统。使用两个串联反应器可以实现较高的乙酯收率(> 90%)和较高的酸转化率(> 90%)。使用酸性大豆油(50 AV),Lipozyme RM IM和Novozym 435的反应分别在2和25小时后达到95%和70%的乙酯含量。结果表明,在插层填充床反应器中使用两种不同的商业化固定化脂肪酶可增强酸性大豆油的生物柴油合成。酶促体系使存在于酸性油中的高脂肪酸转化为乙酯。使用两个串联反应器可以实现较高的乙酯收率(> 90%)和较高的酸转化率(> 90%)。使用酸性大豆油(50 AV),Lipozyme RM IM和Novozym 435的反应分别在2和25小时后达到95%和70%的乙酯含量。结果表明,在插层填充床反应器中使用两种不同的商业化固定化脂肪酶可增强酸性大豆油的生物柴油合成。酶促体系使存在于酸性油中的高脂肪酸转化为乙酯。使用两个串联反应器可以实现较高的乙酯收率(> 90%)和较高的酸转化率(> 90%)。使用酸性大豆油(50 AV),Lipozyme RM IM和Novozym 435的反应分别在2和25小时后达到95%和70%的乙酯含量。结果表明,在插层填充床反应器中使用两种不同的商业化固定化脂肪酶可增强酸性大豆油的生物柴油合成。酶促体系使存在于酸性油中的高脂肪酸转化为乙酯。结果表明,在插层填充床反应器中使用两种不同的商业化固定化脂肪酶可增强酸性大豆油的生物柴油合成。酶系统使酸性油中存在的高脂肪酸转化为乙酯。结果表明,在插层填充床反应器中使用两种不同的商业化固定化脂肪酶可增强酸性大豆油的生物柴油合成。酶促体系使存在于酸性油中的高脂肪酸转化为乙酯。

更新日期:2020-12-13
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