Felizardo Pedro, Correia M Joana Neiva, Raposo Idalina, Mendes João F, Berkemeier Rui, Bordado João Moura
Department of Chemical Engineering, Instituto Superior Técnico, Lisboa, Portugal.
Waste Manag. 2006;26(5):487-94. doi: 10.1016/j.wasman.2005.02.025. Epub 2005 Jun 17.
Waste frying oils transesterification was studied with the purpose of achieving the best conditions for biodiesel production. Transesterification reactions were carried out for 1 h using waste frying oils (WFOs), methanol, and sodium hydroxide as catalyst. In order to determine the best conditions for biodiesel production, a series of experiments were carried out, using methanol/WFO molar ratios between 3.6 and 5.4 and catalyst/WFO weight ratios between 0.2% and 1.0%. For oils with an acid value of 0.42 mg KOH/g, results show that a methanol/WFO ratio of 4.8 and a catalyst/WFO ratio of 0.6% gives the highest yield of methyl esters. Furthermore, an increase in the amount of methanol or catalyst quantity seems to simplify the separation/purification of the methyl esters phase, as showed by a viscosity reduction and an increasing purity to values higher than 98% for methyl esters phase.
为了实现生物柴油生产的最佳条件，对废煎炸油的酯交换反应进行了研究。以废煎炸油（WFOs）、甲醇和氢氧化钠为催化剂进行了1小时的酯交换反应。为了确定生物柴油生产的最佳条件，进行了一系列实验，使用的甲醇/WFO摩尔比在3.6至5.4之间，催化剂/WFO重量比在0.2%至1.0%之间。对于酸值为0.42 mg KOH/g的油，结果表明甲醇/WFO比为4.8且催化剂/WFO比为0.6%时甲酯产率最高。此外，甲醇量或催化剂量的增加似乎简化了甲酯相的分离/纯化，这表现为粘度降低以及甲酯相纯度提高至高于98%的值。
