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本文推算了甲醛液相组成为１０％和２０％时的甲醇－甲缩醛－甲醛－水四元系汽液平衡，给出了ＸＦ＝１０％、ＸＦ＝２０％时的等ＹＷ、ＹＭ和等温图
In this paper, the vapor-liquid equilibrium of methanol-methylal-formaldehyde-water quaternary system with 10% and 20% formic acid liquid phase is deduced. Equivalent YW, YM and XM are obtained when XF = 10% and XF = 20% Isothermal map