Topic
Countercurrent exchange
About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors analyzed the effect of a falling liquid tube on the cooling of a hot tube by a sputtering liquid film and provided a solution for the liquid coolant vaporized during its fall from the sputtering film front.
15 citations
15 citations
Patent•
20 Oct 1954
15 citations
TL;DR: A mixer-settler module, consisting of a regenerative pump and a fluid cyclone, which is more suitable than a countercurrent column for supercritical systems, was developed and dimensioned in this paper.
Abstract: The efficiency of conventional countercurrent extraction-columns is relatively poor when using highly compressed gases, in particular as a consequence of substantial longitudinal mixing and film detachment. It is therefore obvious that the apparatus must be adapted to the supercritical conditions. A mixer-settler module, consisting of a regenerative pump and a fluid cyclone, which is more suitable than a countercurrent column for supercritical systems, was thus developed and dimensioned in this project. Murphree efficiencies of 81 and 96% were found for a module of this type on the synthetic test system α- tocopherol-α-tocopherol acetate-C0 2 . The same module was also suitable as an equilibrium apparatus for the requisite phase-equilibrium measurements.
15 citations
TL;DR: In this paper, a non-isothermal dynamic simulation model of a countercurrent supercritical fluid extraction column with structured packing is presented, where the two countercurrent fluid phases and the structured packing are assumed to be in local thermal equilibrium.
Abstract: A non-isothermal dynamic simulation model of a countercurrent supercritical fluid extraction column with structured packing is presented. The model incorporates momentum and energy balances in the packed bed. The two countercurrent fluid phases and the structured packing are assumed to be in local thermal equilibrium, a reasonable assumption given the high surface area of the packing. The dynamic model is validated by comparing predicted results with experimental data for the fractionation of the binary mixture squalene + methyl oleate with supercritical carbon dioxide. Good agreement is obtained between measured and predicted temperature and composition profiles of gas and liquid phases along the packed bed. The dynamic model is further employed to determine optimal extraction conditions that maximize squalene recovery subjected to purity constraints in the raffinate stream.
15 citations