Reactive extraction, a novel technique, was experimentally investigated for the removal of propionic acid, which is usually present in low concentrations in aqueous solutions. The experiments were conducted according to statistical design to develop an appropriate regression model. This was aimed at analyzing and optimizing the process variables and extraction efficiency for propionic acid reactive extraction from dilute aqueous streams using trioctylamine as extractant and 1-decanol as organic diluent. Response surface methodology in combination with Box–Behnken design involving 17 experimental runs was utilized for the propionic acid reactive extraction in this study. Three independent process variables were chosen as temperature (T), initial propionic acid concentration (C_PAO) in the aqueous phase and trioctylamine composition (C_TOA) in the organic phase. The statistical design analysis demonstrated that the propionic acid concentration and TOA composition had a significant effect while temperature had an insignificant effect on the response value as well as an interactive and quadratic effect on the response. The optimum conditions for propionic acid extraction were established as T = 300.752 K, C_TOA = 18.252 %v/v, CPAO = 0.408 kmol/m³. Under these optimum conditions, the propionic acid experimental extraction yield was 89.788 %, which was in close conformity with the predicted yield value of 91.939 %.

中文翻译：

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响应面法优化技术在1-癸醇中使用三辛胺反应萃取丙酸

通过实验研究了反应性萃取（一种新技术）以去除丙酸，丙酸通常以低浓度存在于水溶液中。根据统计设计进行实验，以开发合适的回归模型。目的是分析和优化使用三辛胺作为萃取剂和1-癸醇作为有机稀释剂从稀水流中丙酸反应性萃取的工艺变量和萃取效率。在本研究中，将响应面方法与Box-Behnken设计相结合（涉及17个实验）用于丙酸反应性萃取。选择三个独立的过程变量作为温度（T），丙酸初始浓度（C _PAO）在水相中和三辛胺组成（C _TOA）在有机相中。统计设计分析表明，丙酸浓度和TOA组成具有显着影响，而温度对响应值的影响不明显，而对响应的交互作用和二次影响则不明显。确定丙酸萃取的最佳条件为T = 300.752 K，C _TOA = 18.252％v / v，CPAO = 0.408 kmol / m ³。在这些最佳条件下，丙酸的实验提取率为89.788％，与预测的91.939％的收率相符。