Acidity Reduction of Bio-Oil by Methylic Esterification Reactions

Angolan Mineral, Oil & Gas Journal Pub Date : 2021-04-19 DOI:10.47444/AMOGJ.V2I2.4

Gabriel Henrique Wienhage, Eloá Suelen Ramos, L. Chiarello, V. Botton, V. Wiggers

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引用次数: 2

Abstract

An alternative to fossil fuels is the use of triglyceride biomass for conversion to biofuel by the thermal cracking process, also known as pyrolysis. The liquid phase, called bio-oil, has physicochemical properties like petroleum-derived fuels. One of the undesirable characteristics of bio-oil is the high acidity index, due to the presence of short-chain carboxylic acids in its composition. This feature makes refining and use inviable. The objective of this work was to perform esterification reactions using bio-oil, produced from soybean oil pyrolysis already characterized, in order to reduce its acidity index. Besides that, the esterified bio-oil was submitted to different washing experiments to decrease even more the final acidity. For the esterification reaction 25 g of bio-oil was used at a temperature of 64 °C, using from 0.8 to 2.2% sulfuric acid and 0.5 to 99.5% mass ratio of methyl alcohol and bio-oil. The highest acidity index reduction after 20 min was 81.2%, the esterified bio-oil reduced from 129 to 32.4 mg KOH g-1. Esterification reaction followed by washing and neutralization can decrease even more those values and, the acidity index can reach zero.

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甲基酯化反应对生物油酸度的降低

化石燃料的替代品是使用甘油三酯生物质通过热裂解过程转化为生物燃料，也称为热解。这种被称为生物油的液相具有与石油衍生燃料类似的物理化学性质。生物油的不良特性之一是由于其组成中存在短链羧酸而导致酸度指数高。这一特性使得精炼和使用变得不可行的。本工作的目的是利用已表征的大豆油热解所得的生物油进行酯化反应，以降低其酸度指数。此外，对酯化后的生物油进行了不同的洗涤实验，以进一步降低最终的酸度。酯化反应用量为25 g，温度为64℃，硫酸用量为0.8 ~ 2.2%，甲醇与生物油的质量比为0.5 ~ 99.5%。20 min后酸度指数降低81.2%，酯化生物油由129 mg KOH g-1降至32.4 mg KOH g-1。酯化反应后再进行洗涤中和可使这些值进一步降低，酸度指数可达零。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Angolan Mineral, Oil & Gas Journal

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