Claims
- 1. A regenerating medium for cation exchange resins, comprising:a quantity of sodium chloride; and an additive comprising respective minor amounts of a source of Sn+2 ion and an acid selected from the group consisting of phosphorous acid, phosphoric acid and mixtures thereof, said Sn+2 ion source and acid being mixed with said sodium chloride.
- 2. The medium of claim 1, said additive being a dispersion in an aqueous medium.
- 3. The medium of claim 1, said additive being a powdered mixture.
- 4. The medium of claim 1, said additive being present at a level of from about 0.01-2% by weight.
- 5. A method of regenerating a cation exchange resin comprising the steps of contacting a resin to be regenerated with a medium in accordance with claim 1.
- 6. The medium of claim 1, said Sn+2 ion source comprising stannous chloride.
- 7. The medium of claim 1, said Sn+2 ion source being present at a level to provide from about 0.3-15% by weight Sn+2 ion in said additive.
- 8. The medium of claim 1, said acid being present at a level of from about 0.1-75% by weight in said additive.
- 9. The medium of claim 1, including an alkali metal hexametaphosphate.
RELATED APPLICATION
This is a division of application Ser. No. 09/082,035 filed May 20, 1998 now pending.
US Referenced Citations (14)
Non-Patent Literature Citations (3)
Entry |
Chem. Abstracts 116:200836, (1991). |
Chem. Abstracts 125:64852, (1996). |
Chem. Abstracts 109:79478, (1987). |