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.
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TL;DR: In this paper , a functional map was proposed to construct to get a maneuverable region so that an optimal two-phase solvent system for separation of a target compound could be selected easily, which saved a lot of manpower for high speed countercurrent chromatographic separation.
3 citations
TL;DR: In this article , a mixed-integer nonlinear programming (MINLP) model for synthesizing membrane systems for multicomponent gas mixture separation is presented, which employs a richly connected superstructure to represent numerous potential system configurations and different physics-based surrogate permeator models, such as countercurrent flow or crossflow, to be used in each stage.
3 citations
TL;DR: In this paper, a numerical analysis for gas absorption accompanied by a second-order reaction into a liquid layer of finite thickness in laminar flow is presented, with the gas-phase mass transfer resistance and the axial decrease of the solute concentration due to absorption being taken into account.
Abstract: Numerical analysis is presented for gas absorption accompanied by a second-order reaction into a liquid layer of finite thickness in laminar flow, with the gas-phase mass transfer resistance and the axial decrease of the gas-phase solute concentration due to absorption being taken into account. Both cocurrent and countercurrent flow modes are analyzed, where the presence of significant resistance or axial decrease of the solute concentration in the gas phase can lead to substantially lower rates of gas absorption than those found when the influence of gas-phase mass transfer is not considered. Approximate expressions describing the exact numerical solution to the enhancement factor in the cocurrent flow mode are developed and can be extrapolated for estimating the enhancement factor in a more general case of a (1, n)-th-order reaction in which the influence of gas-phase mass transfer cannot be neglected.
3 citations
Patent•
15 Sep 1998TL;DR: In this paper, the authors define a reaction zone for reacting liquid petroleum or chemical streams wherein the liquid stream flows countercurrent to the flow of a treat gas, such as a hydrogen-containing gas.
Abstract: A reactor for reacting liquid petroleum or chemical streams wherein the liquid stream flows countercurrent to the flow of a treat gas, such as a hydrogen-containing gas. The reactor is comprised of at least one vertically disposed reaction zone, each containing a bed of catalyst, wherein each reaction zone may contain vapor bypass means, and wherein each reaction zone is immediately preceded by a non-reaction zone, and wherein each non-reaction zone contains a gas/liquid contacting zone for stripping gaseous by-products, such as NH3 and H2S, from the liquid stream.
3 citations
TL;DR: In this article, the removal of cyanides from water by air oxidation was discussed and experiments were carried out in a countercurrent fixed bed reactor for three different values of temperature, concentration, gas and liquid flow rates.
Abstract: This study was conducted to discuss the removal of cyanides from water by air oxidation. Experiments were carried out in a countercurrent fixed bed reactor for three different values of temperature, concentration, gas and liquid flow rates. It was operated at pH 12 by using delrin (formaldehyde polymer) as packing material. Effects of some operating parameters on the conversion were studied, and it was observed that the conversion percent increased by increasing temperature and decreasing gas and liquid flow rates. Effect of concentration was not steady. A conversion of 89% was achieved under optimum conditions while it ranges from 44 to 79% at room temperature.
3 citations