Removal of sulfate ions from brine
AssigneeThe Dow Chemical Company
InventorsJohn M. Lee, William C. Bauman
Life of this patent
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Abstract
Macroporous cation exchange resins with sulfonic acid functional groups having polymeric hydrous zirconium oxide and polyacrylic acid contained therein are useful in substantially removing sulfate, borate, bicarbonate and/or phosphate ions from alkali metal salt solutions.
Claims12
Macroporous cation exchange resin beads having sulfonic acid functional groups and having post-deposited therein polymeric hydrous zirconium oxide and polyacrylic acid.
A process for preparing a composite of macroporous cation exchange resins having sulfonic acid functional groups and having polymeric hydrous zirconium oxide and polyacrylic acid contained therein, said process comprising
- wetting macroporous cation exchange resin beads having sulfonic acid functional groups with an aqueous solution of a zirconyl compound which forms a precipitated hydrous zirconium oxide when alkalized,
- alkalizing said zirconyl compound by contacting it with an alkaline material, thereby precipitating hydrous zirconium oxide in said resin,
- incorporating acrylic acid in the so-formed composite, and
- polymerizing the acrylic acid in-situ.
A process for removing sulfate, borate, bicarbonate and/or phosphate ions from an aqueous alkali metal salt solution, said process comprising
- contacting said alkali metal salt solution with a macroporous cation exchange resin having sulfonic acid functional groups and having post-deposited therein hydrous zirconium oxide and polyacrylic acid.
Dependencies are inferred from the claim text.