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Separation of phenols from aqueous micellar solutions by cloud point extraction
1Institute of Chemical Technology and Engineering, Poznan University of Technology, Pl. M. Sklodowskiej-Curie 2, 60-965 Poznan, Poland.
Journal of Colloid and Interface Science
|April 19, 2003
Summary
Oxyethylated methyl dodecanoates effectively recover phenols from water using cloud point extraction. Adding electrolytes like sodium chloride enhances phenol recovery efficiency and modifies surfactant properties for optimal separation.
Area of Science:
- Environmental Chemistry
- Separation Science
- Surfactant Chemistry
Background:
- Phenolic compounds are common environmental pollutants.
- Nonionic surfactants offer potential for separating phenols from aqueous solutions.
- Cloud point extraction (CPE) is an efficient separation technique.
Purpose of the Study:
- To investigate the use of oxyethylated methyl dodecanoates for phenol recovery via CPE.
- To explore factors influencing cloud point and extraction efficiency.
- To determine the order of phenol recovery and the effect of electrolytes.
Main Methods:
- Cloud point extraction using oxyethylated methyl dodecanoates.
- Modification of cloud points by adjusting surfactant hydrophilicity and adding co-surfactants or electrolytes.
- Modeling cloud point behavior using hydrophile-lipophile balance (HLB).
- Analysis of surfactant-rich phase composition and phenol recovery rates.
Main Results:
- Oxyethylated methyl dodecanoates are effective nonionic surfactants for phenol separation.
- Cloud points are tunable by surfactant structure and electrolyte addition.
- Phenol recovery order: 4-nitrophenol > 4-methylphenol > phenol.
- Sodium chloride significantly enhanced phenol recovery and extraction efficiency.
- The surfactant-rich phase contained only 5-15% water.
Conclusions:
- Oxyethylated methyl dodecanoates provide a versatile platform for phenol removal from water.
- Salting-out electrolytes are beneficial for decreasing cloud points and improving extraction.
- CPE with these surfactants offers a promising method for environmental remediation of phenolic pollutants.
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