Open AccessEfficiency of different additives in the improvement of the oxidation stability of fatty acid methyl esters with different properties
Author(s) -
Milica Rankov-Sicar,
Radoslav D. Mićić,
Milan Tomić,
Nataša Đurišić-Mladenović
Publication year - 2021
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc210209029r
Subject(s) - chemistry , degree of unsaturation , en 14214 , antioxidant , sunflower oil , organic chemistry , methylene , butylated hydroxytoluene , raw material , nuclear chemistry , food science , biodiesel , biodiesel production , catalysis
This study evaluates six formulations in improving the oxidation stability of different fatty acid methyl esters (MEs). Two MEs differed in the unsaturation levels as they were synthesized from different feedstock: a blend of soybean and sunflower oils, and waste cooking oil; they did not fulfill the requirements of the EN 14214 standard concerning their oxidation stability (?0.6 h) and some impurities. The third MEs (SoSuME-EN) were fully compliant with the standard. Five formulations were phenolic-based, containing single or mixed antioxidant compounds of different molecular structures; one was amine-based. Different dosages of the formulations were added to the ME samples (corresponding to the addition range 50?48300 ppm). The MEs stability expressed as induction periods, IP, determined by the Rancimat method, were used for the calculation of stabilization factors, SF, indicating the efficiency of the applied formulation. The formulation containing 2-(1,1-dimethylethyl)- 1,4-benzenediol was the most efficient concerning the lowest consumption rate and the highest SF achieved for the low quality ME. 2,2?-Methylene- -bis-(4-methyl-6-tert-butylphenol) was linked with higher antioxidant potency than the amine-based formulation and the phenolic compounds with two bulky tert-butyl groups. Among the 4 selected phenolic additives, butylated hydroxytoluene and 2,2?-methylene-bis-(4-methyl-6-tert-butylphenol) had similar efficiency in SoSuME-EN (at ?500 ppm they produced SF ? 2), while it took twice of this amount for mixed butylphenols to achieve the same effect.