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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
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Journal ArticleDOI
TL;DR: In this paper, a countercurrent Trickle Flow Reactor for acidifying 6-Aminopenicillanic acid from Penicillin G is described. But the complexity of the countercurrent trickle flow Reactor requires a mathematical model, incorporating the effects of hydrodynamics, heterogeneous biocatalysis and multicomponent ion exchange.

10 citations

Patent
07 Dec 1999
TL;DR: In this article, a process for upgrading a liquid petroleum or chemical stream wherein said stream flows countercurrent to the flow of a treat gas, such as a hydrogen-containing gas, in at least one reaction zone is described.
Abstract: A process for upgrading a liquid petroleum or chemical stream wherein said stream flows countercurrent to the flow of a treat gas, such as a hydrogen-containing gas, in at least one reaction zone. Injecting feed into one or more downstream reaction zones controls the temperature of at least one reaction zone.

10 citations

Patent
09 Mar 2010
TL;DR: In this article, a composite continuous countercurrent fluidized moving bed and/or expanded moving bed (FMB/EMB) system is proposed for continuous recovery, purification or reaction of single or multiple component/s of interest.
Abstract: The composite continuous countercurrent fluidized moving bed (FMB) and/or expanded moving bed (EMB) for carrying out processes such as recovery, purification or reaction of single or multiple component/s of interest, by contacting liquid phase containing the said component/s with the solid adsorbent in continuous countercurrent mode. In this composite fluidized moving bed and/or expanded moving bed system the net movement of the solids is against the liquid flowing in upward direction through the stages/columns, and sedimenting solids from the one stage/column are continuously fed to the top of the another stage/column placed below or alongside of previous stage/column, and also operating in fluidized/expanded bed mode, wherein its countercurrent contact with up flowing liquid is carried out. The system described herein consists of number of stages/column as per requirement of the process. The sedimenting adsorbent solids from the last fluidized bed or expanded bed stage/column are taken out continuously and fed back to the top of the first stage/column, through a feed hopper to which the adsorbent solids are transported by means of pump or liquid solid ejector, or any other suitable device. The feed hopper is suitably designed and operated, so as deliver solid adsorbents to the top of the first stage/column continuously in a controlled manner. The flow of solid adsorbent through the said solid downcomer tube/s is controlled using valves appropriate to afford control over the downward adsorbent flow. The FMB/EMB system can be used in processes for continuous recovery, purifications or reactions of various products.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of ideal countercurrent recycle cascades (CCRCs) is compared with continuous membrane columns (CMCs) using ideal plug flow models, and the basic reasons for the greater efficiency of CCRC are explored.
Abstract: In this paper the performance of ideal countercurrent recycle cascades (CCRCs) are compared with continuous membrane columns (CMCs) using ideal plug flow models. The calculations show that CCRCs require much smaller total membrane area and much lower compressor duty than CMCs for the same overall cut and enrichment, especially at higher enrichments and state cuts. The basic reasons for the greater efficiency of CCRC are explored.

10 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022115
202127
202041
201947
201849