Direct Yellow and Methylene Blue liquid-liquid extraction with alkylene carbonates.
Chemosphere
; 60(8): 1151-6, 2005 Aug.
Article
em En
| MEDLINE
| ID: mdl-15993164
ABSTRACT
Propylene and 1,2-butylene carbonates enable very effective extraction of Methylene Blue. The use of a more hydrophobic 1,2-butylene carbonate is preferred for practical application. Separation is enhanced by addition of an electrolyte (NaCl). Partition coefficients for solutions containing Methylene Blue and 1M NaCl are at least a hundred times higher than for Direct Yellow solutions. The recovery of Methylene Blue with propylene and 1,2-butylene carbonates is significantly better, compared with the cloud point technique. Cloud point technique yields to almost 100% only in the case of low concentrations of Methylene Blue in the feed (0.5mg dm(-3)). For higher initial concentrations (0.01-0.25 g dm(-3)) of Methylene Blue, this method of recovery provides low extraction percentages (10-40%). Alkylene carbonates are not appropriate extractants for recovery of very hydrophilic Direct Yellow.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Propano
/
Compostos Azo
/
Corantes
/
Alcenos
/
Azul de Metileno
/
Naftalenos
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Polônia