Open AccessAcidity Reduction of Bio-Oil by Methylic Esterification Reactions
Author(s) -
Gabriel Henrique Wienhage,
Eloá Suelen Ramos,
Luana Marcele Chiarello,
Vanderléia Botton,
Vinicyus Rodolfo Wiggers
Publication year - 2021
Publication title -
angolan mineral, oil and gas journal
Language(s) - English
Resource type - Journals
ISSN - 2708-2989
DOI - 10.47444/amogj.v2i2.4
Subject(s) - chemistry , pyrolysis , biofuel , biomass (ecology) , pulp and paper industry , organic chemistry , alcohol , sulfuric acid , petroleum , oil refinery , waste management , engineering , oceanography , geology
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.