Biodiesel Production from Waste Oils Mixed with Animal Tallows and Vegetable Oil by Transesterification Using Ultrasonic Irradiation

Abstract

− Transesterifications of waste oils mixed with animal tallows and vegetable oil by ultrasonic energy were examined over various catalysts for biodiesel production. Reaction activities of the transesterification were evaluated to the ultrasonic energy and thermal energy. The physicochemical properties of feedstock and products were also investigated to the biodiesels produced from the oils in the reaction using ultrasonic energy. The highest fatty acid methyl ester (FAME) yield was obtained on the potassium hydroxide catalyst in the transesterification by ultrasonic irradiation. The effective reaction conditions by ultrasonic energy were 0.5 wt% catalyst loading and 6:1 molar ratio of methanol to the mixed oils. The reaction rate of the transesterification by ultrasonic energy was faster than that by thermal energy. The highest yields of FAME were obtained as 80% in 5 min and the reaction equilibrium reached at that time.

Viscosity Characteristics of Waste Cooking Oil with Ultrasonic Energy Irradiation

“…However, there is little research on biodiesel for agricultural engines without esterification in waste cooking oil. According to Chung and Park (2010), using ultrasonic energy irradiation in transesterification made reaction faster and acid value lower over 30%. In addition, Im et al (2007) reported that ultrasonic energy irradiation to biodiesel blended fuel lower the viscosity.…”