花生油酯交换工艺参数对制备生物柴油的影响

A. Jimoh, A. Abdulkareem, A. Afolabi, J. O. Odigure, F. Emanuel
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引用次数: 1

摘要

本研究通过24个试验因子设计,考察了反应参数对两阶段花生油酯交换反应产率的影响,重点研究了花生油酯交换反应产率的优化。对花生油进行预处理,先用硫酸和乙醇酯化,再用氢氧化钠和乙醇酯交换,去除水分,降低游离脂肪酸。在油与乙醇摩尔比为1:6、反应温度为60℃、催化剂浓度为1.0 wt%、反应时间为90 min的条件下,可得乙酯(生物柴油)的最佳收率为99%。所生产的生物柴油的燃料特性包括动力学粘度、十六烷值、闪点等,测定值均在ASTM D 6751推荐的可接受标准范围内。对24因子实验结果进行方差分析,结果表明,摩尔比、催化剂浓度、反应温度和反应时间4个参数对乙酯的收率有显著影响,其贡献率和影响分别为29.6667%和4.35、6.27121%和-2、38.2213%和4.9375、3.12801%和3.12801。结果表明,除摩尔比-催化剂浓度-反应时间的相互作用p值低于95%置信水平外,各反应参数之间的相互作用对乙酯收率有显著影响。建立了一个一级线性数学模型,该模型被认为可以完全描述该系统,并进一步用于开发以乙醇和KOH为催化剂的两步酯交换工艺为原料的花生油生物柴油产量预测软件。
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Effects of Transesterification Parameters on the Biodiesel Produced from Crude Groundnut Oil
This study focused on optimization of biodiesel yield from crude groundnut oil through a two-stage transesterification process by investigating the effect of reaction parameters on the yield using a 24 experimental factorial design. The crude groundnut oil was pretreated to remove water and reduce its FFA by esterification using sulphuric acid and ethanol followed by transesterification using sodium hydroxide and ethanol. The optimum ethyl ester (biodiesel) yield of 99% was obtained at optimum conditions of 1:6 wt/wt oil to ethanol molar ratio, reaction temperature of 60oC, catalyst concentration of 1.0 wt% and reaction time of 90 minutes. The biodiesel produced was characterized for fuel properties that include kinetic viscosity, cetane number, flash point etc. and the determined values were found to be within the acceptable standard as recommended by the ASTM D 6751. Statistical analysis of the 24 factorial experimental results was conducted using ANOVA, it was evidently proved that the four (4) reaction parameters i.e. molar ratio, catalyst concentration, reaction temperature and time had significant effects on the yield of the ethyl ester with their percentage contribution and effects being 29.6667% and 4.35, 6.27121% and -2, 38.2213% and 4.9375, 3.12801% and 3.12801 respectively. Also, it was proved that interaction between the reactions parameters had significant effect on the ethyl ester yield except the interaction between molar ratio-catalyst concentration-reaction time whose p-value was below the 95% confident level. A first degree linear mathematical model was developed and it was seen to completely describe the system and the model was further used to develop software that predicts biodiesel yield from crude groundnut oil using two-step transesterification process with ethanol and KOH as the catalyst.
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