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用新型泵式沸点仪测定了常压下甲缩醛－甲醇－甲醛－水四元系在不同液相组成时的沸点，采用“甲醛虚拟饱和蒸汽压”的处理方法，用Ｗｉｌｓｏｎ方程对所测数据进行了关联，建立了该系统汽液平衡的热力学模型，并推算了平衡的汽相组成
The boiling point of methylal - methanol - formaldehyde - water quaternary system at different pressure was measured by a new pump - type boiling point instrument. The “virtual saturated vapor pressure of formaldehyde” The data were correlated and a thermodynamic model of the vapor-liquid equilibrium of the system was established and the equilibrium vapor phase composition was calculated