Based on systematic investigation and analysis of literature

p aminobenzene sulfonic acid is selected as a typical solute to be separated from dilute solution.An aliphatic

straight chain tertiary amine

7301

is used as complexing agent.Since the pH of aqueous solution is an important factor in chemical complexation extraction of p aminobenzene sulfonic acid

its effect on extraction equilibium is especially studied in the experiments.The effects of concentration of complexing agent and type of diluents on distribution ratio D are also investigated.Meanwhile

the proton transfer equilibrium is discussed.By using Mass Action Law

an expression of equilibrium distribution ratio for 7301 system is proposed.The results show satisfying precision of the model.