10.6084/m9.figshare.4565167.v1 Kalpana Rewatkar Kalpana Rewatkar Diwakar Z. Shende Diwakar Z. Shende Kailas L. Wasewar Kailas L. Wasewar Modeling and Optimization of Reactive Extraction of Gallic Acid Using RSM Taylor & Francis Group 2017 Gallic acid Hexanol Optimization Reactive extraction Response surface methodology Tri-n-octyl amine 2017-01-19 15:42:18 Journal contribution https://tandf.figshare.com/articles/journal_contribution/Modeling_and_Optimization_of_Reactive_Extraction_of_Gallic_Acid_Using_RSM/4565167 <p>Reactive extraction was experimentally investigated for recovery of gallic acid (GA) from the aqueous solution using tri-<i>n</i>-octylamine (TOA) as extractant in hexanol. All experiments were carried out according to statistical design in order to develop a regression model used to optimize the extraction of GA. Two independent variables were selected as: initial concentration of GA (<i>C</i><sub>GA0</sub>) in aqueous phase and concentration of TOA (<i>C</i><sub>TOA</sub>) in organic phase. The statistical analysis showed that both the independent variables had significant effect on response value, followed by the quadratic and interactive effect on response. A five-level central composite rotatable design (CCRD) was employed. Analysis of variance (ANOVA) showed a high coefficient of determination (<i>R</i><sup>2</sup> = 99.0%). The optimal extraction conditions of GA were determined as: <i>C</i><sub>GA0</sub> = 2.01 g/L, <i>C</i><sub>TOA</sub> = 6.8% v/v. At the optimum conditions, the experimental yield of GA was 91.9%, which was in close agreement with the predicted value of 93.2%.</p>