Improved solvent removal

Improved solvent removal

  • CN 102,238,996 B
  • Filed: 12/08/2009
  • Issued: 08/08/2017
  • Est. Priority Date: 12/08/2008
  • Status: Active Grant
First Claim
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1. a kind of method for being used to remove solvent from the solution of source, methods described includesDraw solution is prepared by solution pervasion agent in a solvent,A) side contacts of the source solution and permoselective membrane are made,B) another side contacts of the draw solution and the film are made, wherein, the draw solution is prepared as having than describedThe higher osmotic pressure of source solution so that the solvent in the source solution dilutes the absorption by directly penetrating through the filmSolution,C) from the draw solution being diluted remove solvent so that the draw solution regenerate, andD) draw solution of regeneration is recycled to step b),Wherein:

  • Target solute species in the source solution flowed through in the direct impregnation step film enter it is described draw it is moltenIn liquid;

    AndMake in step c) before or after the draw solution regeneration, a part for the draw solution is abandoned, so as to dropThe concentration of the low solute species from the source solution being present in the draw solution.

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