Fractionation of dilute acetic acid aqueous mixtures was operated using a continuous countercurrent packed column with supercritical CO₂. A generic procedure was developed to assess the feasibility of such an operation. Experiments were performed using a 2 m high and 17 mm inner diameter column, in the range (10−15 MPa) and (40 °C–60 °C). Thermodynamics of the mixture was described using the Soave-Redlich-Kwong equation modified by Boston Mathias with PSRK mixing rules and UNIQUAC activity coefficient model. Experimental results were compared to simulation using a software based on the concept of equilibrium stage. Conventional liquid-liquid extraction methods indicated that thermodynamics limits the separation performances. Therefore, an external extract reflux configuration was tested by simulation. It was shown that the limitation could be overridden and influence of design (number of stages, position of the feed) and operating conditions (reflux ratio, solvent-to-feed ratio) has been assessed.

使用具有超临界CO ₂的连续逆流填充塔进行稀乙酸水溶液混合物的分馏。开发了通用程序来评估这种操作的可行性。实验是使用2 m高，17 mm内径的柱子进行的，测量范围为（10-15 MPa）和（40°C–60°C）。使用波士顿·马西亚斯（Boston Mathias）修改的Soave-Redlich-Kwong方程，PSRK混合规则和UNIQUAC活度系数模型描述了混合物的热力学。使用基于平衡阶段概念的软件将实验结果与仿真进行了比较。常规的液-液萃取方法表明，热力学限制了分离性能。因此，通过模拟测试了外部提取物回流配置。结果表明，该限制可以被克服，并且可以影响设计（阶段数，进料位置）和操作条件（回流比，