| US 7,572,379 B2 | ||
| Removal of metal ions from onium hydroxides and onium salt solutions | ||
| Takao Niinobe, Nara (Japan); and Wilfred Wayne Wilson, Bastrop, Tex. (US) | ||
| Assigned to SACHEM, Inc., Austin, Tex. (US) | ||
| Filed on Sep. 02, 2005, as Appl. No. 11/223,247. | ||
| Prior Publication US 2007/0051627 A1, Mar. 08, 2007 | ||
| Int. Cl. B01D 15/36 (2006.01); B01J 39/08 (2006.01) | ||
| U.S. Cl. 210—660 [210/681; 210/687; 210/688] | 33 Claims |
| 1. A process for removing dissolved metal ions from an onium hydroxide and/or salt solution, comprising:
providing a weak acid ion exchange medium;
providing a solution comprising magnesium ions;
forming a magnesium-loaded ion exchange medium by contacting the ion exchange medium with the solution comprising magnesium
ions;
contacting the magnesium-loaded ion exchange medium with an onium hydroxide and/or salt solution containing a first quantity
of dissolved metal ions, wherein at least a portion of the dissolved metal ions are removed from the onium hydroxide and/or
salt solution; and
collecting the onium hydroxide and/or salt solution after the contacting, wherein the solution collected contains a second
quantity of dissolved metal ions smaller than the first quantity.
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