Volumetric Method for Free and Total Glycerin Determination in Biodiesel

Abstract

In the past few years, biodiesel has gained considerable attention due to the increasing concern for the environmental problems associated with the use of fossil fuels. The quality control of this renewable fuel involves numerous analyses, several of them requiring the use of analytical instruments. According to ASTM and EN standards, the analyses of free and total glycerin which are of particular relevance to biodiesel quality must be carried out by GC analysis. This work presents an alternative volumetric method, which does not need expensive equipment, and is therefore particularly useful for quality control in small facilities. Another advantage of the proposed method is that it also overcomes the shortcomings of the GC procedure, such as detection limits and type of raw material used to produce biodiesel. While the GC analysis is restricted to biodiesel obtained from soybean, rapeseed or sunflower oil, the volumetric method has no limitations in this sense.

Optimization of methyl esters production from non-edible oils using activated carbon supported potassium hydroxide as a solid base catalyst

“…The BD yield was calculated by the following equation: and carbon residue (ASTM D 4530) were determined. AOCS Cc 17-95 was followed to determine the soap content of the prepared biodiesel, whereas (Pisarello, Dall-Csta, Veizaaga, & Querini, 2010) was used for determining the total and free glycerin in the produced methyl esters. Each property was measured in triplicate and the result was presented as the mean-± standard deviation (SD).…”

Co-Solvent Transesterification of Bitter Almond Oil Into Biodiesel: Optimization of Variables and Characterization of Biodiesel

“…Determinations of the cloud and pour points (ASTM D2500-17a), Conradson carbon residue (ASTM D4530-15), the acid value (ASTM D664-17), the flash point (ASTM D93-16a) and the saponification value (ASTM D5555-95(2017)) were also performed. Method proposed by Pisarello et al (2010) was used for determination of the total glycerine in the produced alkyl esters. This method is based on its oxidation to formic acid using sodium periodate, followed by a titration with sodium hydroxide.…”

Ethanolysis of fish oil via optimized protocol and purification by dry washing of crude ethyl esters

“…The cetane number was determined using a digital cetane number meter (Shatox, Russian Federation). The total glycerin of the produced fuel was determined using method proposed by Pisarello et al [26]. The glycerin titration was based on its oxidation to formic acid using sodium periodate, followed by a titration with sodium hydroxide [26].…”