Abstract Disposing of residual cooking oil is a major environmental concern, so its conversion into commercial products desirable goal. To design the chemical modification domestic waste valuable biochemicals other than biodiesel, we analyzed series samples, collected over period three years, using quantitative 1 H-NMR. This analysis, allowing quick determination main characteristics, has rende...

A supercritical methanol transesterification method was applied to produce biodiesel from the high-acid oil of soybean soapstock. The fuel properties of biodiesel produced with various molar ratios of methanol to raw oil were analyzed and compared in this experimental study. Oleic acid (C18:1), linoleic acid (C18:2), and palmitic acid (C16:0) were the three main compounds in the high-acid oil-b...