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US 2017/0259256 A1Published application
Regeneration of weak base anion exchange resins
AssigneeThe Purolite Company
InventorsWilliam Fries, Carmen Mihaela Iesan, Robert Moore
Life of this patent
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Abstract
The present invention relates generally to regeneration of weak base anion exchange resins and more particularly to regeneration using low concentrations of sodium hydroxide and/or sodium carbonate to remove ionic contaminants from the resins.
Claims23
A method of regenerating a weak base anion exchange resin, comprising:
- providing a weak base anion exchange resin, at least partially bound to acid;
- contacting said exchange resin with a regenerant solution, said regenerant solution comprising one or more alkali compounds at a concentration of 3 percent (weight per volume) or less, thereby displacing said acid from said resin;
- and
- rinsing said exchange resin to remove said regenerant solution and said acid from said resin.
1 more element
(canceled)
(canceled)
A method for removing acid from a solution of starch-based sweetener, comprising:
- contacting a sweetener solution containing acid with a weak base anion exchange resin to bind said acid to said resin;
- removing said exchange resin from contact with said sweetener solution when the capacity of said resin is reduced to a predetermined condition;
- contacting said exchange resin having reduced capacity with a regenerant solution, said regenerant solution comprising one or more alkali compounds at a concentration of about 2 percent (weight per volume) or less, thereby displacing said acid from said resin;
- and
- rinsing said exchange resin to remove said regenerant solution and said acid from said resin.
2 more elements
(canceled)
A method for removing acid from a solution of organic feedstock, comprising:
- contacting an organic feedstock containing acid with a weak base anion exchange resin to bind said acid to said resin;
- removing said exchange resin from contact with said organic feedstock when the capacity of said resin is reduced to a predetermined condition;
- contacting said exchange resin having reduced capacity with a regenerant solution, said regenerant solution comprising one or more alkali compounds at a concentration of about 2 percent (weight per volume) or less, thereby displacing said acid from said resin;
- and
- rinsing said exchange resin to remove said regenerant solution and said acid from said resin.
2 more elements
Dependencies are inferred from the claim text.