Gelation in the aqueous solutions of oxyethylated nonylphenols
https://doi.org/10.21285/achb.965
EDN: UTPISA
Abstract
The study was aimed at ascertaining gelation conditions for the systems water – oxyethylated nonylphenol and water – oxyethylated nonylphenol – salting agent. The work involved analyzing scientific and technical literature on the use of surfactants in extraction processes. Systems containing nonionic surfactants are shown to be promising extraction systems. The effect that the concentration of nonionic surfactants and temperature can have on gelation in aqueous solutions is examined. The problem of using oxyethylated nonylphenols in gel extraction is considered. The phase diagrams of the systems water – neonol AF 9-6 and water – neonol AF 9-6 – sodium sulfate were constructed using the visual polythermal method. Gelation conditions were ascertained for the systems water – neonol AF 9-6 and water – neonol AF 9-6 – sodium sulfate. For the gel to form in the system water – oxyethylated nonylphenol (neonol AF 9-6), the concentration of the surfactant must exceed 25 wt%. For achieving gelation at lower concentrations of neonol AF 9-6, it is necessary to introduce a salting agent (sodium sulfate). The phase diagrams of the systems water – oxyethylated nonylphenol – sodium sulfate were constructed within the temperature range of 20–65 °C. The gel structure was found to form at a 3:1 weight ratio of oxyethylated nonylphenol to sodium sulfate. It is shown that for gelation, the minimum concentrations of neonol AF 9-6 and sodium sulfate are 15 and 5 wt%, respectively. An increase in the concentrations of neonol AF 9-6 and sodium sulfate to 24 and 8 wt%, respectively, leads to a decrease in the gelation temperature to 46 °C.
Supporting agencies: The Ministry of Education of the Republic of Belarus financial supported the work (grant GB 24-042 “Development of a method for processing used motor oils in order to obtain environmentally friendly softening oils for the rubber industry”).
About the Authors
V. I. Zholnerkevich
Belarusian State Technological University
Belarus
Belarus
Veronika I. Zholnerkevich, Graduate Student
13a, Sverdlov St., Minsk, 220006
A. O. Shrubok
Belarusian State Technological University
Belarus
Belarus
Alexandra O. Shrubok, Cand. Sci. (Engineering), Associate Professor
13a, Sverdlov St., Minsk, 220006
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Review
For citations:
Zholnerkevich V.I., Shrubok A.O. Gelation in the aqueous solutions of oxyethylated nonylphenols. Proceedings of Universities. Applied Chemistry and Biotechnology. 2025;15(1):112-118. (In Russ.) https://doi.org/10.21285/achb.965. EDN: UTPISA
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