HDI/癸二酸二辛酯二元体系气液平衡数据的测定及关联

Measurement and correlation of vapor-liquid equilibrium data for HDI/DOS

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 vapor pressures of hexamethylene diisocyanate （HDI） at different temperatures ranging from （368.75 to 423.00） K have been measured using the quasi-static ebulliometric method. Isobaric vapor-liquid e- quilibrium （VLE） data for the HDI and dioctyl sebacate binary system were measured at different temperatures ran- ging from （369.81 to 424.55） K. Aspen Plus software was used to obtain the regression parameters and the regres- sion deviations for the nonrandom two-liquid （NRTL） and Wilson models. The results showed that the overall aver- age absolute deviations of temperatures were less than 1.55K. Furthermore, the relative volatilities of the binary system under different pressures were calculated. The results showed that azeotropic phenomena were present in the HDI and dioetyl sebacate binary system in the pressure range 0. 300 - 0. 900 kPa and the HDI mole fraction in the azeotrope was in the range 0. 105 -0. 112. As a result, when separating HDI in the studied pressure range, about 10% HDI will be carried out together with the solvent.