The phase behavior of potassium sulfate(K_(2)SO_(4))in polyethylene glycol with molecular weight 8000(PEG8000)andwater(H_(2)O)mixed solvent at 288.15,298.15,and 308.15 Kwere determined.According to the results,when th...The phase behavior of potassium sulfate(K_(2)SO_(4))in polyethylene glycol with molecular weight 8000(PEG8000)andwater(H_(2)O)mixed solvent at 288.15,298.15,and 308.15 Kwere determined.According to the results,when the temperature are 288.15 and 298.15 K,there is only a solid-liquid phase equilibrium relationship in the system,and the phase diagrams are both divided into three parts which respectively are the regions of unsaturated homogeneous liquid(L),one liquid and one solid K_(2)SO_(4)(L+S)and one liquid and twosolids K_(2)SO_(4)and PEG8000(L+2S).The solubility of K_(2)SO_(4)in PEG8000-H_(2)O mixed solvent decreased with the addition of the PEG8000 in the solution.Comparing the diagrams of 288.15 and 298.15 K,the sizes of regions of(L)and(L+S)increased and that of(L+2S)decreased with the increase of temperature.While at 308.15 K,solid-liquid and liquid-liquid equilibrium coexist,and there are six parts in the complete phase diagram at 308.15 K,adding the areas of one liquid and one solid K_(2)SO_(4)(L+S),two liquids(2 L),two liquids and one solid K_(2)SO_(4)(2 L+S).The equations developed by Merchuk,Hu,and Jayapalwere used to fit the binodal curves data of the systemat 308.15 K,meanwhile,the experimental tie-line data of the system at 308.15 K were correlated by Othmer-Tobias equation and Bancroft equation.展开更多
基金financially supported by the National Natural Science Foundation of China(U1507111).
文摘The phase behavior of potassium sulfate(K_(2)SO_(4))in polyethylene glycol with molecular weight 8000(PEG8000)andwater(H_(2)O)mixed solvent at 288.15,298.15,and 308.15 Kwere determined.According to the results,when the temperature are 288.15 and 298.15 K,there is only a solid-liquid phase equilibrium relationship in the system,and the phase diagrams are both divided into three parts which respectively are the regions of unsaturated homogeneous liquid(L),one liquid and one solid K_(2)SO_(4)(L+S)and one liquid and twosolids K_(2)SO_(4)and PEG8000(L+2S).The solubility of K_(2)SO_(4)in PEG8000-H_(2)O mixed solvent decreased with the addition of the PEG8000 in the solution.Comparing the diagrams of 288.15 and 298.15 K,the sizes of regions of(L)and(L+S)increased and that of(L+2S)decreased with the increase of temperature.While at 308.15 K,solid-liquid and liquid-liquid equilibrium coexist,and there are six parts in the complete phase diagram at 308.15 K,adding the areas of one liquid and one solid K_(2)SO_(4)(L+S),two liquids(2 L),two liquids and one solid K_(2)SO_(4)(2 L+S).The equations developed by Merchuk,Hu,and Jayapalwere used to fit the binodal curves data of the systemat 308.15 K,meanwhile,the experimental tie-line data of the system at 308.15 K were correlated by Othmer-Tobias equation and Bancroft equation.
