Зелений метод визначення кислотного числа біопалив лужної трансестерифікації

Abstract

This work deals with investigation of 4-hydroxystyryl merocyanine dye 1-ethyl-4-[2-(3,5- dimethyl-4-hydroxystyryl )]quinolin-1-ium bromide as indicator for the determination of the total acid number (TAN) by visual titrimetric and instrumental methods of analysis. The determination of the acid number plays a significant role in the analysis of industrial products, especially for biodiesel. Test samples of biodiesel were prepared in the laboratory by transesterification method. A new green rapid method was developed and validated for determination of TAN of biodiesel. Proposed method offers many advantages over ASTM D664 method, such as less toxic, cost saving, and reduced analysis time. The advantages of applying 4-hydroxystyryl dyes in analytical analysis provide the opportunity to apply these dyes as indicators in determination of Total Acid Number in industrial oils. These results are in a good agreement with the standard methods of determination of Total Acid Number. 4-hydroxystyryl dyes are making very important contribution in green chemistry analysis due to unique properties.