The influence of equilibrium time, pH of dye solution, extractant
concentration, dye concentration, temperature, diluents
and aqueous to organic phase ratio on the extraction of dye
from aqueous solution was investigated. The results showed
that the dye was totally removed under the optimum conditions.
For stripping process, the best stripping agent for methylene
blue was 0.5 M thiourea in 1 M HCl. The solvent can be
reused without loss of efficiency.