Abstract: The aqueous solution of salicylic acid can be recovered by liquid membrane process.The influence of rate of stirring(n), molar ratio of NaOH in internal phase and salicylicacid in external phase(r), volume ratio of oil phase to internal solution phase(Roi)andvolume ratio of emulsion phase to external solution phase(Rew)on the kinetics of masstransfer process were studied. It was shown that when r=1.2-1.5 the diffusion of salicy-lic acid was nonstationary and there was a linear relationship between concentration C and √t(t-time). When r≥3.52 the diffusion of salicilic acid was stationary and therewas a linear relationship between Ln(C_o/C)and t.

Key words: salicylic acid, liquid membrane, mass transfer process