A rapid method for the quantitative analysis of total acid number in biodiesel based on headspace GC technique

•Rapid quantification of the total acid number (TAN) in biodiesel.•This method is based on the reaction between acidic species in biodiesel and sodium bicarbonate.•The CO2 formed from the reaction can be quantitatively detected by GC.•The HS-GC method can be utilized for analyzing TAN in biodiesel....

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Bibliographic Details
Published in:Fuel (Guildford) 2017-12, Vol.210, p.236-240
Main Authors: Xie, Wei-Qi, Gong, Yi-Xian, Yu, Kong-Xian
Format: Article
Language:English
Subjects:
Acids
Bicarbonates
Biodiesel
Biodiesel fuels
Biofuels
Carbon dioxide
Carbonates
Chemical compounds
Chromatography
Diesel
Fatty acids
Gas chromatography
Headspace
Potentiometric titration
Quantitative analysis
Sodium
Sodium bicarbonate
Studies
Titration
Total acid number
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Summary:•Rapid quantification of the total acid number (TAN) in biodiesel.•This method is based on the reaction between acidic species in biodiesel and sodium bicarbonate.•The CO2 formed from the reaction can be quantitatively detected by GC.•The HS-GC method can be utilized for analyzing TAN in biodiesel. The purpose of this work is to introduce a rapid and practical method for quantitatively analyzing total acid number in biodiesel by a reaction headspace gas chromatography. In this method, the carbon dioxide formed by the reaction of acidic species (i.e., fatty acids) in biodiesel and sodium bicarbonate can be measured by GC. The results showed that the complete reaction can be achieved in 25min at 75°C. The relative standard deviation of this method in total acid number determination was within 2.93%, the relative differences has been determined by comparing the total acid number obtained from this new analytical technique with the data from the reference technique (i.e., potentiometric titration), which are less than 8.05%. The reaction HS-GC technique is automated, efficient and can be a reliable tool for quantifying the total acid number in biodiesel and related research.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2017.08.070