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.

Method for combined use of accelerated solvent extraction and high speed countercurrent chromatogram and device thereof

Abstract: The invention discloses a method for the combined use of accelerated solvent extraction and high speed countercurrent chromatogram and a device thereof. An accelerated solvent extraction device extracts a material so as to obtain an extraction liquid which is collected by a liquid storage bottle. The extraction liquid is pumped by a peristaltic pump into a dosing ring. Stationary phase in the liquid storage bottle is pumped by a plunger pump into a high speed countercurrent chromatography. The high speed countercurrent chromatography is started, and simultaneously the plunger pump is used forpumping flowing phase in the liquid storage bottle into the high speed countercurrent chromatography for purpose of solvent system balance. Sample solution in the dosing ring is pumped into the high speed countercurrent chromatography. A preparing-type high speed countercurrent chromatogram is used for purification and preparation so as to obtain a target component, or an analysis-type high speedcountercurrent chromatogram is used for analyzing the target component in a natural product extract liquid. The above steps are integrated with the accelerated solvent extraction and the high speed countercurrent chromatogram by utilizing a switch valve, thereby realizing the online extraction, separation, purification and preparation of the natural product effective component and having the advantages of fastness, high efficiency and high automation. The method and the device have a wide application prospect in the fields such as food, medicine, biology and the like.

Countercurrent Electrolysis in a Cell Where Porous Membranes Have Been Connected in Series with Ion-Exchange Membranes. Part 1. Method

Abstract: A new cell arrangement for countercurrent electrolysis in a porous membrane is presented. In this cell, where porous membranes are connected in series with ion-exchange membranes, much better separations are obtained compared to the procedure where the membrane is made thicker. However, separation is less than if convection is increased, but power consumption is also less. An iterative method is presented for solving convection as well as the concentrations in different compartments, when electric current, outflow rate, and concentrations of the product stream are specified.