Synthesis of alkanolamide nonionic surfactant using used cooking oil
Abstract
In this paper, alkanolamide nonionic surfactants were achieved by amidation of the methyl esters with ethanolamine at 140 oC, in 2 h in which methyl esters were synthesized by alkali catalyzed transesterification of the waste cooking oil, using methanol to oil molar ratio of 6:1. Additionally, to enhance surface-active property of the surfactants, C=C couple bonds in long chain alkyl of methyl esters were epoxidized by HCOOH/H2O2 before amidation. The obtained surfactants were characterized by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR). Furthermore, properties of the surfactants including surface tension, foamability and emulsifying power were also investigated. The results of this study showed that the waste cooking oil can be a potential source of cheap and suitable raw material for synthesis of surfactants.
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