Method and sorbent for selective removal of contaminants from fluids
AssigneeLayne Christensen Company
InventorJohanna Teresia Moller
Life of this patent
Estimating the term…
Abstract
Anion exchange materials loaded with oxygen-containing metal compounds within the exchange matrix as a sorbent, and a method for preparation. The materials remove arsenic and other ligands or contaminants from water and other fluid streams.
Claims19
A method to load an anion exchange material with a metal, the method comprising
- contacting an anion exchange material with a metal salt in a solvent consisting essentially of water under conditions to load the anion exchange material with a metal salt,
- contacting the metal salt loaded anion exchange material with a base for a time sufficient to precipitate a hydrous metal oxide, and
- washing and neutralizing the metal oxide loaded anion exchange material to remove excess base.
A method of removing at least one contaminant from a fluid stream, the method comprising contacting at least a portion of a fluid stream with a metal oxide loaded anion exchange material under conditions sufficient to result in a treated fluid stream with reduced contaminants, the loaded anion exchange material prepared by
- contacting the anion exchange material with a metal salt in a solvent consisting essentially of water under conditions to load the anion exchange material with a metal salt,
- contacting the metal salt loaded anion exchange material with a base for a time sufficient to precipitate a hydrous metal oxide, and
- washing and neutralizing the metal oxide loaded anion exchange material to remove excess base.
A method to load an anion exchange material with hydrous iron oxide, the method comprising
- contacting an anion exchange material with a solution of FeCl3 in a solvent consisting essentially of water under conditions to load the anion exchange material FeCl3,
- contacting the FeCl3 loaded anion exchange material with a base for a time sufficient to precipitate a hydrous metal oxide, and
- washing and neutralizing the hydrous iron oxide loaded anion exchange material to remove excess base.
Dependencies are inferred from the claim text.