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采用准静态方法测定了368.75~423.00 K温度范围内1,6-己二异氰酸酯(HDI)单组分的饱和蒸汽压,以及HDI与癸二酸二辛酯(DOS)在369.81~424.55 K温度范围内的气液相平衡数据。借助Aspen Plus软件对实验数据进行回归,得到了溶液理论中非随即(局部)双液体(NRTL)模型方程、Wilson模型参数及关联偏差,结果表明,两种模型拟合得到的温度平均绝对偏差均小于1.55 K。进而计算了二元组分相对挥发度,发现HDI与DOS在0.300~0.900 k Pa范围内存在最高共沸现象,共沸物中HDI的摩尔分数为0.105~0.112。因此,在HDI精制分离时,循环溶剂中会携带10%左右的HDI。
The saturated vapor pressures of 1, 6-hexamethylenediisocyanate (HDI) in the temperature range of 368.75 ~ 423.00 K were determined by quasi-static method. The saturated vapor pressures of HDI and dioctyl sebacate (DOS) in the range of 369.81 ~ 424.55 K Within the gas-liquid equilibrium data. The experimental data are regressed with Aspen Plus software, and the non-random (local) two-liquid (NRTL) model equations, Wilson model parameters and the correlation deviations in solution theory are obtained. The results show that the mean temperature absolute deviations Less than 1.55 K. Then the relative volatility of binary components was calculated. It was found that HDI and DOS had the highest azeotropic phenomenon in the range of 0.300-0.900 k Pa, and the molar fraction of HDI in the azeotrope was 0.105-0.112. Therefore, in the HDI purification separation, the circulating solvent will carry about 10% HDI.