In this paper, the influence of finite mass transfer resistance on the steady state and dynamic behavior of spatially distributed counter-current separation processes is analyzed. Special attention is given to the pinch states, at which thermodynamic equilibrium between the phases prevails. In a classical paper, Sundaresan et al. (1987) have shown that these pinch states may depend on the mass transfer coefficients. It is shown that this apparent contradiction can be explained by means of wave reflections at the system boundaries, which are reported here to the best of our knowledge for the first time. As an application example, a counter-current adsorption process as introduced in the above reference is considered, and it is shown how these wave solutions can be constructed in the concentration phase space by using the characteristic curves of equilibrium theory in combination with the wave trajectories generated with a non-equilibrium model.

本文分析了有限传质阻力对空间分布逆流分离过程稳态和动态行为的影响。特别注意夹点状态，在该状态下，相之间存在热力学平衡。在一篇经典论文中，Sundaresan 等人。(1987) 表明，这些收缩状态可能取决于传质系数。结果表明，这种明显的矛盾可以通过系统边界处的波反射来解释，据我们所知，这是第一次在这里报告。作为应用示例，考虑了上述参考文献中介绍的逆流吸附过程，