Aqueous solution was simulated by ammonium perrhenate and sodium sulfate as impurties in sulphuric acid system. Molalities of perrhenate after extraction were measured at impurity ionic strength from 0.2 to 2.0 mol x kg(-1) in aqueous phase at 278.15 K, 283.15K, 288.15 K, 293.15K, 298.15 K, and 303.15 K using N235. The best extraction condition was determined in this sulphuric acid medium. Standard extraction constants K degrees at various temperatures were obtained by polynomial approximation method. Some microcosmic phenomena were investigated in the extraction process. (C) 2014 Elsevier B.V. All rights reserved.