关键词:

固液平衡, 4-羟基苯甲醛, 3-溴-4-羟基苯甲醛, 3,5-二溴-4-羟基苯甲醛, 差示扫描量热法, 相图

Abstract:

The solid-liquid equilibrium data for a ternary system of 4-hydroxybenzaldehyde (3) + 3-bromo-4-hydroxybenzaldehyde (2) + 3,5-dibromo-4-hydroxybenzaldehyde (1) were determined with differential scanning calorimetry (DSC).The data were obtained through the method of determining the solid-liquid equilibrium data for the pseudo-binary solution.The solid-liquid equilibrium data of the ternary system showed that the mixture was a eutectic system with mole fractions x_l=0.2445, x₂=0.3883, x₃ =0.3672, and T_eu=338.5 K.The corresponding eutectic type phase diagram was also presented.The data were correlated by the Ott’s equation.With interaction parameters from binary systems，the Wilson equation was extended to correlate the solid-liquid equilibrium data of the ternary system and the root mean square deviation of temperature was only 0.97 K.It demonstrates that the Wilson equation predicts the solid-liquid equilibrium for the ternary system with fair accuracy.

Key words:

固液平衡, 4-羟基苯甲醛, 3-溴-4-羟基苯甲醛, 3,5-二溴-4-羟基苯甲醛, 差示扫描量热法, 相图