A system for extracting ions from an aqueous solution without utilizing ion exchange. A semi-permeable membrane with 0.1 to 1000 nm diameter pores separates an aqueous salt solution from a chelating gel. The gel has un-crosslinked polymer (e.g. 1-10% by weight) and the balance water. The semi-permeable membrane lets ions diffuse into the chelating gel where the ions become trapped. The gel has a molecular weight that prevents its diffusion through the semi-permeable membrane.
|Status||Published - 8-aug.-2019|