Cloud Point Extraction of Cationic Surfactants and Their Ionic Associates with Sodium Dodecyl Sulfate S.O. Lelyushok*, V.O. Doroschuk, S. A. Kulichenko
	* Corresponding authors Analytical Chemistry Department, Faculty of Chemistry, Taras Shevchenko Kyiv University, Volodymyrska Str. 64, Kyiv, 01033, Ukraine; *e-mail: lelyushok@ukr.net
	Methods Objects Chem. Anal., 2020, 15(3), p. 111-116 https://doi.org/10.17721/moca.2020.111-116
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Abstract

The distribution of individual cationic surfactants and their ionic associates with the anionic surfactant in the cloud point extraction systems, based on non-ionic surfactant OP-7 was investigated. Determined that the dependence of the extraction degree of halides alkylpyridiniums on carboxylic change length in optimal conditions for extraction is characterized by the existence of maximum for cationic surfactant where n = 12. Decrease as well as increase in carboxylic change length of cation of alkylpyridiniums diminishes the effectiveness of their extraction into the surfactant-rich phase. The peculiarities of inter phase distribution of ionic associates cationic surfactant – anionic surfactant in the micellar extraction systems are investigated. It was shown, that with the increase in carboxylic change length of cationic surfactant the dependence of extraction degree of associates with anionic surfactant is characterized by the existence of the maximum. Most effective into the surfactant-rich phase extracted of ionic associates of three- and tetradecylpyridinium. Decreasing and increasing of hydrophobicity of alkylpyridiniums diminishes the effectiveness of extraction of associates. The established effects are explained by the hydrophobic correspondence between the substrate and the surfactant-rich phase of non-ionic surfactant.

Keywords: сloud point extraction, non-ionic surfactant, cationic surfactants, sodium dodecyl sulfate, ionic associates

Article language: Ukr