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The combination of 1‐butyl‐3‐methylimidazolium hydrogen sulfate ([Bmim]HSO4) ionic liquid (IL) and microwave heating was used to esterify oleic acid as a green approach in biodiesel synthesis. To compare the heating systems, conventional heating and the ultrasonic method were employed but the microwave method was found to be more effective. H2SO4 and 1‐methyl imidazole hydrogen sulfate ([Hmim]HSO4...
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