Patent ID: 6203704
Filing Date: 2001-03-20
Classification: B01D,B03B,C22B,Y02P

Abstract:
A method for separating an objective component from a crude material in a multistage counter flow system, comprising:(a) contacting crude material stored in at least one tank with a washing liquid or an extracting reagent to form a mixture of the crude material and the washing liquid or extracting reagent;(b) separating the mixture into a recovered liquid containing the objective component and a residue, with the proviso that the mixture is not separated with a separation membrane that is connected to a tank containing the crude material; andrepeating (a) and (b) at least once, whereinthe washing liquid or extracting agent in at least first (a) contains the objective component before contact with the crude material; andthe concentration of the objective component is successively lower in the washing liquid or extracting reagent before contact with the crude material in each (a).