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- W2201471135 abstract "The nonionic surfactants when in aqueous solution, have the property of separating into twophases, one called diluted phase, with low concentration of surfactant, and the other one richin surfactants called coacervate. The application of this kind of surfactant in extractionprocesses from aqueous solutions has been increasing over time, which implies the need forknowledge of the thermodynamic properties of these surfactants. In this study weredetermined the cloud point of polyethoxylated surfactants from nonilphenolpolietoxylatedfamily (9,5 , 10 , 11, 12 and 13), the family from octilphenolpolietoxylated (10 e 11) andpolyethoxylated lauryl alcohol (6 , 7, 8 and 9) varying the degree of ethoxylation. The methodused to determine the cloud point was the observation of the turbidity of the solution heatingto a ramp of 0.1 ° C / minute and for the pressure studies was used a cell high-pressuremaximum ( 300 bar). Through the experimental data of the studied surfactants were used tothe Flory - Huggins models, UNIQUAC and NRTL to describe the curves of cloud point, andit was studied the influence of NaCl concentration and pressure of the systems in the cloudpoint. This last parameter is important for the processes of oil recovery in which surfactant insolution are used in high pressures. While the effect of NaCl allows obtaining cloud points fortemperatures closer to the room temperature, it is possible to use in processes withouttemperature control. The numerical method used to adjust the parameters was the Levenberg -Marquardt. For the model Flory- Huggins parameter settings were determined as enthalpy ofthe mixing, mixing entropy and the number of aggregations. For the UNIQUAC and NRTLmodels were adjusted interaction parameters aij using a quadratic dependence withtemperature. The parameters obtained had good adjust to the experimental data RSMD < 0.3%. The results showed that both, ethoxylation degree and pressure increase the cloudy points,whereas the NaCl decrease" @default.
- W2201471135 created "2016-06-24" @default.
- W2201471135 creator A5062261745 @default.
- W2201471135 date "2013-11-11" @default.
- W2201471135 modified "2023-09-27" @default.
- W2201471135 title "Equilíbrio líquido-líquido de sistemas aquosos com tensoativospolietoxilados: dados experimentais e modelagem" @default.
- W2201471135 hasPublicationYear "2013" @default.
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