Process for recovering palladium from a solution
AssigneeKinetico Incorporated
InventorsEdward Robakowski JR., Lyle E. Kirman
Life of this patent
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Abstract
A method for selectively separating and recovering palladium from an aqueous palladium/tin catalyst solution. The method includes the steps of adjusting the pH of the aqueous solution to a specified pH range thereby precipitating the tin, and producing a soluble form a palladium. The solution can be either pre-filtered or settled and subsequently processed through ion exchange resin in a conventional manner, or processed in an upflow direction through an at least partially fluidized bed of ion exchange resin to remove and concentrate the palladium for recovery.
Claims16
A process for selectively removing palladium ions from a solution comprising palladium ions and tin ions, the process comprising the steps of:
- a) adjusting a pH of the solution comprising palladium ions and tin ions, wherein the adjusted pH is in a range from about 2.0 to about 3.5;
- b) removing a tin precipitate from the solution;
- and
- c) contacting the solution with an ion exchange resin effective to selectively remove palladium ions from the solution.
A process for removing palladium ions from an aqueous solution comprising soluble tin and soluble palladium, the process comprising adjusting the pH of the aqueous solution to a level wherein at least about 90 percent of the palladium remains in solution and greater than 99 percent of the tin in the solution forms a tin precipitate;
- and contacting the aqueous solution with an ion exchange resin, wherein the ion exchange resin contains functional groups effective to impart an affinity for the soluble palladium.
A process for selectively removing palladium ions from a solution comprising palladium ions and tin ions, the process comprising the steps of:
- a) adjusting a pH of the solution comprising palladium ions and tin ions, wherein the adjusted pH is in a range from about 2.0 to about 3.5;
- b) agitating the solution;
- c) resting the solution, wherein a tin precipitate settles to a bottom portion of the solution;
- d) decanting the solution from the tin precipitate to obtain a clear solution characterized by having less than 1 mg/liter of soluble tin remaining in solution;
- and
- e) contacting the clear solution with an ion exchange resin effective to remove the palladium ions from the solution.
Dependencies are inferred from the claim text.