PHENOL ESTIMATION USING FLORY-HUGGINS PARAMETERS AND CLOUD POINT OF POLIETHOXYLATE SURFACTANTS
| Autor: | Alessandro Alisson de Lemos Araújo, Edson Luiz Foletto, Wanessa Paulino Neves Silva, Eduardo Lins de Barros Neto |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Cloud point
Phenol Chemistry Non-ionic surfactant Enthalpy Thermodynamics Phenol extraction 02 engineering and technology General Medicine Flory–Huggins solution theory 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Standard deviation 0104 chemical sciences chemistry.chemical_compound Ethoxylation Pulmonary surfactant 0210 nano-technology Flory-Huggins model |
| Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| ISSN: | 1982-0593 |
| DOI: | 10.5419/bjpg2019-0002 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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