SOLVENT SUBLATION AND ADSORBING COLLOID FLOTATION OF MAGENTA

Magenta was removed from aqueous solution into paraffin oil by solvent sublation of a magenta-lauryl sulfate complex. Over 96% of magenta was removed in 25 min. A stoichiometric amount of surfactant was found to be most effective for magenta removal (1 mol of surfactant to 1 mol of dye). First-order kinetics was not followed. It is proposed that some kinds of aggregate of the dye-surfactant complex may exist in the solution. Magenta was also removed by adsorbing colloid flotation techniques using either ferric hydroxide or aluminum hydroxide as the coagulant. Sodium lauryl sulfate was used as the collector. Over 99. 6% of magenta was removed from the solution in as little as 3 min. However, the amount of surfactant needed appears to be high.