Reactive Extraction of Propionic Acid Using Tributyl Phosphate in Imidazolium-Based Ionic Liquids: Optimization Study Using Response Surface Methodology

Yıl 2019, Cilt: 40 Sayı: 4, 928 - 938, 31.12.2019

Nilay Baylan

https://doi.org/10.17776/csj.586822

Cited By: 3

Öz

In this work, the reactive extraction of propionic acid from aqueous solutions
using imidazolium-based ionic liquids was examined. Ionic liquids,
1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][Tf₂N]),
and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF₆])
were utilized as diluents. Tributyl phosphate (TBP) as an extractant in ionic
liquids was used. D-optimal design based on the response surface methodology
(RSM) has been exerted to specify the effect of different variables on the
reactive extraction process. Initial propionic acid concentration (2-10% w/w),
extractant (TBP) concentration (0-3.00 mol.L^-1) and temperature
(25-45 ℃) were chosen as numerical variables, and type of ionic liquid was
chosen as a categorical variable. Extraction efficiency, selected as a
dependent variable, was calculated from the experimental data. In addition to,
the model equation for the extraction efficiency was created. The optimum
extraction conditions were obtained as the initial propionic acid concentration
of approximately 5% (w/w), TBP concentration in ionic liquids of 3 mol.L^-1
and temperature of 45^○C. Under these conditions,
the values of extraction efficiency were determined as 85.64% for [BMIM][PF₆],
and 81.91% for [BMIM][Tf₂N]. This study has indicated that the
systems of TBP in ionic liquids is an efficient and green reactive extraction
method for the removal of propionic acid from the aqueous media.

Anahtar Kelimeler

Propionic acid, Imidazolium-Based Ionic Liquids, Tributyl phosphate, Reactive extraction, Response surface methodology.

Kaynakça

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