聚聚乙氧基表面活性剂的聚簇参数和浊点对苯酚的评价

Alessandro Alisson de Lemos Araújo, Wanessa Paulino Neves Silva, E. Foletto, E. Neto
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引用次数: 0

摘要

这项工作考察了通过云点改变壬基酚醛聚聚氧基酸表面活性剂(NPEOn)的乙氧基化程度(9.5、10、11和12)来提取苯酚的热力学。采用Flory-Huggins模型对混合物的焓(ΔHmix)和熵(ΔSmix)参数以及聚合数(N)进行了估计。结果表明,ΔHmix和ΔSmix值与所使用的表面活性剂的乙氧基化程度有直接关系。不同的是,聚合数(N)值与乙氧基化程度呈反比关系。对所研究的每种表面活性剂,flery - huggins模型拟合的标准差(SD)范围为0.161 ~ 4.037。结果表明,表面活性剂+水体系中苯酚浓度的增加导致表面活性剂的浊点降低。这些结果对该表面活性剂在苯酚萃取工艺中的应用具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PHENOL ESTIMATION USING FLORY-HUGGINS PARAMETERS AND CLOUD POINT OF POLIETHOXYLATE SURFACTANTS
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.
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