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Direct Yellow and Methylene Blue liquid-liquid extraction with alkylene carbonates
Magdalena Regel-Rosocka1, Jan Szymanowski
1Institute of Chemical Technology and Engineering, Poznan University of Technology, Pl. M. Sklodowskiej-Curie 2, 60-965 Poznan, Poland. magdalena.regel@put.poznan.pl
Chemosphere
|July 5, 2005
Summary
Propylene and 1,2-butylene carbonates effectively extract Methylene Blue, especially with added NaCl. This method surpasses the cloud point technique for Methylene Blue recovery, particularly at higher concentrations.
Area of Science:
- Environmental Chemistry
- Separation Science
Background:
- Methylene Blue is a common dye with environmental implications.
- Efficient dye removal from wastewater is crucial.
- Existing methods like the cloud point technique have limitations.
Purpose of the Study:
- To evaluate the efficacy of propylene and 1,2-butylene carbonates for Methylene Blue extraction.
- To compare this method with the cloud point technique.
- To investigate the effect of electrolytes on extraction efficiency.
Main Methods:
- Liquid-liquid extraction using propylene and 1,2-butylene carbonates.
- Addition of sodium chloride (NaCl) as an electrolyte.
- Comparison of extraction percentages and partition coefficients with the cloud point technique.
Main Results:
- Propylene and 1,2-butylene carbonates demonstrated highly effective Methylene Blue extraction.
- 1,2-butylene carbonate is preferred due to its hydrophobicity.
- Extraction efficiency significantly improved with 1M NaCl, increasing partition coefficients over 100-fold compared to Direct Yellow.
- The carbonate method outperformed the cloud point technique, especially for higher Methylene Blue concentrations (0.01-0.25 g dm(-3)).
Conclusions:
- Alkylene carbonates are effective extractants for Methylene Blue recovery.
- The addition of NaCl enhances separation efficiency.
- This extraction method offers a superior alternative to the cloud point technique for Methylene Blue removal from aqueous solutions.