Some aspects of biodiesel oxidative stability
Some aspects of biodiesel oxidative stability
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DOI：
10.1016/j.fuproc.2007.01.005
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发表时间：
2007-07-01
影响因子：
7.5
通讯作者：
Knothe, Gerhard
中科院分区：
文献类型：
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作者：
Knothe, Gerhard
生物柴油是一种来源于植物油、动物脂肪或用过的煎炸油的“替代”柴油燃料，主要由构成这些原料的脂肪酸的单烷基酯组成。生物柴油面临的主要技术问题之一是其在暴露于环境空气中的氧气时对氧化的敏感性。这种敏感性是由于其不饱和脂肪酸链的含量，特别是那些与双烯丙基亚甲基部分。脂肪酸链的氧化是通过多种机制进行的复杂过程。除了空气的存在之外，各种其他因素也会影响生物柴油的氧化过程，包括光的存在、升高的温度、外来物质（例如甚至可能存在于容器材料中的金属）、过氧化物和抗氧化剂，以及生物柴油和空气之间的表面积的大小。改善生物柴油氧化稳定性的方法包括故意添加抗氧化剂或改变脂肪酯的组成。讨论了影响生物柴油氧化稳定性的因素及其相互作用。改善生物柴油这一性能的途径与这些因素和相应的机制有关。由Elsevier B出版。诉
Biodiesel, an "alternative" diesel fuel derived from vegetable oils, animals fats or used frying oils, largely consists of the mono-alkyl esters of the fatty acids comprising these feedstocks. One of the major technical issue facing biodiesel is its susceptibility to oxidation upon exposure to oxygen in ambient air. This susceptibility is due to its content of unsaturated fatty acid chains, especially those with bis-allylic methylene moieties. Oxidation of fatty acid chains is a complex process that proceeds by a variety of mechanisms. Besides the presence of air, various other factors influence the oxidation process of biodiesel including presence of light, elevated temperature, extraneous materials such as metals which may be even present in the container material, peroxides, and antioxidants, as well as the size of the surface area between biodiesel and air. Approaches to improving biodiesel oxidative stability include the deliberate addition of antioxidants or modification of the fatty ester profile. This article discusses some factors influencing biodiesel oxidative stability and their interaction. Resulting approaches to improving this property of biodiesel are related to these factors and the corresponding mechanisms. Published by Elsevier B. V.