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The liquid–liquid equilibrium (LLE) of {polyethylene glycol di-methyl ether 2000 {(PEGDME2000) + (NH4)2SO4 +H2O} system has been determined experimentally at T = (298.15, 308.15 and 318.15) K and atmospheric pressure (≈85 kPa). To investigate the effect of molar mass of the polymer on the tie-lines, similar measurements were also made at T = 298.15 K on this two-phase system consisting of the PEGDME...