Phenol estimation using flory-huggins parameters and cloud point of poliethoxylate surfactants

• Autor(a) principal: Araújo, A. A. L.
• Data de Publicação: 2019
• Outros Autores: Silva, W. P. N., Foletto, Edson Luiz, Barros Neto, Eduardo Lins de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38943
• topic: Non-ionic surfactant; Cloud point; Phenol; Flory-Huggins model

This work examines the thermodynamics of phenol extraction by cloud point varying the ethoxylation degrees of nonylphenolpoliethoxylate surfactants (NPEOn) (9.5, 10, 11 and 12). The Flory-Huggins model was applied to estimate enthalpy (ΔHmix) and entropy (ΔSmix) parameters of the mixture, as well as the aggregate number (N). Results show that ΔHmix and ΔSmix values have a direct relationship with the ethoxylation degree of the surfactant used. Differently, aggregate number (N) values have an inverse relationship with the ethoxylation degree. The fitting to the Flory-Huggins model presented a standard deviation (SD) that ranged from 0.161 to 4.037 for each surfactant studied. It was observed that the increase of the phenol concentration in the surfactant + water system resulted in a decrease in the cloud point of the studied surfactants. These results contribute significantly to the application of this type of surfactant in phenol extraction processes