The maximum yield
of biodiesel obtained with the triple frequency approach, at 3:1molar ratio ofmethanol to oil with 1 wt.% potassium
hydroxide as catalyst was 93% with a significantly reduced reaction time of 15 min as compared to 3 h
required in case of conventional stirring to achieve 75% yield. The results of this investigation support that
using multiple frequency ultrasonic irradiation is beneficial in intensifying the transesterification reaction.
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