Abstract
Removal of phenols from aqueous solutions with solvating extractants The removal of selected phenols (phenol, 4-methoxyphenol, 4-fluorophenol, 4-nitrophenol, 4-methylphenol, 4-chlorophenol, 2,4-dichlorophenol) from aqueous streams by liquid-liquid extraction is studied. Butylene and propylene carbonate - are used as green extractants. They permit to remove almost 100% of the examined phenols from feed solutions of phenol concentration about 20 g/dm3. Additionally, stripping of phenols from loaded organic phases is carried out with NaOH. The results of extraction parameters for alkylene carbonates (extraction efficency and distribution ratio) are compared with commercial solvating extractant - Cyanex 923.
Highlights
Phenols in wastewaters are considered as harmful and toxic for surface water, for tap water
They are not classified as dangerous or toxic substances according to the 2001/59/ EC Directive of the EU. Due to their environmental friendly features, the authors have decided to use alkylene carbonates in the extraction of dyes[11], and for the removal of phenols. It is the aim of this work to study the application of butylene and propylene carbonates for phenol, 4-methoxyphenol, 4-fluorophenol, 4-nitrophenol, 4-methylphenol, 4-chlorophenol and 2,4-dichlorophenol extraction from aqueous solutions and compare their extractive properties with commercial solvating extractant – Cyanex 923
It is not possible to load the organic phase to maximum capacity because of the limited solubility of the studied phenols in water (e.g.: 2,4-dichlorophenol)
Summary
The removal of selected phenols (phenol, 4-methoxyphenol, 4-fluorophenol, 4-nitrophenol, 4-methylphenol, 4-chlorophenol, 2,4-dichlorophenol) from aqueous streams by liquid-liquid extraction is studied. Butylene and propylene carbonate – are used as green extractants. They permit to remove almost 100% of the examined phenols from feed solutions of phenol concentration about 20 g/dm[3]. Stripping of phenols from loaded organic phases is carried out with NaOH. The results of extraction parameters for alkylene carbonates (extraction efficency and distribution ratio) are compared with commercial solvating extractant – Cyanex 923
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