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.
Propionic acid Imidazolium-Based Ionic Liquids Tributyl phosphate Reactive extraction Response surface methodology.
Primary Language | English |
---|---|
Journal Section | Natural Sciences |
Authors | |
Publication Date | December 31, 2019 |
Submission Date | July 4, 2019 |
Acceptance Date | October 12, 2019 |
Published in Issue | Year 2019Volume: 40 Issue: 4 |