| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for obtaining a high concentration solution by extracting solutes in a solution into another solvent using a porous membrane, especially a porous membrane made of a fluororesin, and a method of removing solutes from a solution and concentrating the solutes using the porous membrane. SOLUTION: A solution A containing solutes and a solvent B dissolving the solutes is brought into contact with one side of the porous membrane, and a solvent D incompatible with the solvent B and having a higher solubility of the solutes than that of the solvent B, or a solution C containing the solvent D is brought into contact with the other side of the porous membrane. A pressure lower than a differential pressure required for making the solution A penetrate the porous membrane is loaded on the membrane, and then, in the method of extracting solutes in a solution, the solutes are extracted into the solvent D or the solution C, and in the solute concentration method, a gas phase is brought into contact with the other side of the porous membrane. COPYRIGHT: (C)2011,JPO&INPIT
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