Abstract
With the cost of traditional lipid feedstocks constituting 70% of the total cost of biolubricant production, it is urgent to find a new lipid source for the biodiesel and biolubricant industry. With the elevated acid value (61.8 mg of KOH/g) of housefly larval lipids, converting the free fatty acid (FFA) into a biolubricant could serve as a value-added approach to the larval diesel industry, other than pretreatment by acid-catalyzed esterification for biodiesel production. This study developed a method of producing high-purity fatty acid n-octyl esters (FAOEs) from housefly (Musca domestica L.) larvae. The housefly larva free fatty acids (HLFFAs) from the larva lipids were obtained by wipe-film short-path distillation. FAOEs were produced by esterifying n-octanol with HLFFAs (catalyzed by benzenesulfonic acid under the following conditions: catalyst loading, 2 wt %; molar ratio of n-octanol to FFA, 3:1; temperature, 100 °C; time, 2 h). Excess n-octanol was effectively removed by high-vacuum (80 Pa) distil...
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