Previous studies have shown that the removal of removal of representative flux residues using aqueous nonionic surfactant solutions is closely related to the formation of a microemulsion. In this study, the effect of solvent on phase behavior in systems containing nonionic surfactant was investigated. The used addition of n-hexadecane, the most hydrophobic solvent among during this study, produced lamellar liquid crystalline phase(L α) at low temperatures and two phase microemulsion (w/o microemulsion + excess w) at temperatures higher 52 ℃.