水-异丙醚-对苯二酚液-液-固等温平衡数据的实验测定

用气相色谱仪测定了常压下水-二异丙基醚-对苯二酚在50℃和46℃的两个等温平衡数据.这两个等温截面的特点是:存在单相液体与对苯二酚固体的平衡区域,同时存在液相分层的广阔的两相共存区域.实验表明,等温截面上没有液-液-固三相共存点.实验数据包括对苯二酚的饱和溶解度数据和两液相共存数据.二异丙基醚萃取水中对苯二酚的饱和分配系数仅为0.7～1.3,远小于二异丙基醚萃取水中苯酚的分配系数.结论是:等温下用二异丙基醚萃取水中对苯二酚并不很有效.

Measurement of Isothermal Equilibrium Data of the Water-Diisopropylether-Hydroquinone System

For the water-diisopropylether-hydroquinone system, the isothermal equilibria, especially the isothermal equilibrium data at 323 K and 319 K were measured by gas chromatography respectively. There exist two liquid regions in these isothermal sections. One is the equilibrium region of a single liquid phase with solid hydroquinone. Another is a broad region of two partially miscible liquids. The experimental results show that it does not exist triple point of liquid-liquid-solid in the above isothermal regions. The experimental data measured include the saturated solubility of hydroquinone and compositions of two co-existing liquid phases. The distributive coefficients are about 0.7-1.3 for the extraction of hydroquinone from water with diisopropyl ether, which are much less than those for the extraction of phenol from water with the same extractant. The results show that it is inefficient to use diisopropyl ether as extractant to extract hydroquinone from water isothermally.