The work presented in this book includes the preparation and characterization of choline dodecyl benzene sulfonate and phenyl trimethyl ammonium dodecyl benzene sulfonate, which were prepared and showed almost room temperature ionic liquids. Other ionic liquids based on solid mixing dodecyl benzene sulfonate salts, and benzoic acid, salicylic acid with choline chloride showed a larger melting point depression. (Ammonium dodecyl benzene sulfonate /choline chloride) mixture has a deep eutectic point, while the two mixtures (benzoic acid / choline chloride) and (salicylic acid / choline...