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US 2021/0154658 A1Published application
Method and System to Improve All Phases of Ion-Exchange Resin Regeneration
OwnerAbdullah Kaziinventor
Life of this patent
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Abstract
A semi-continuous or continuous method and system to improve all phases of ion-exchange resin regeneration such as backwash, resin separation, chemical treatment, slow rinse, fast rinse, resin mixing, and final QA/QC to reduce, reuse and recycle water and chemicals employed in ion-exchange resin regeneration operations. Aqueous media quality is controlled in both backwash as well as ion-exchange resin separation.
Claims14
A continuous or semi-continuous ion-exchange resin regeneration system, comprising:
- a backwash subsystem for a mix bed ion-exchange resin to dislodge and release resin fines, particles, and cations and anions adhering to the spent mix bed resin and to fluidize the spent mix bed resin, said backwash subsystem including at least one backwash vessel in fluid communication with a make-up water supply and having a backwash outlet;
- a mix bed resin separation and isolation subsystem for separating and isolating mix bed resin into anion and cation exchange resins, said separation and isolation subsystem including at least one resin separation and isolation vessel in fluid communication with said backwash outlet to receive fluidized resin output from said backwash subsystem;
- a regenerant chemical treatment subsystem in fluid communication with said separation and isolation subsystem outlet to receive separated and isolated fluidized spent resin output from said separation and isolation subsystem, said chemical treatment subsystem including at least one chemical treatment vessel having a regenerant chemical inlet for receiving a flow of regenerant chemical, and a regenerant chemical outlet, a spent resin inlet for receiving a flow of fluidized spent resin, and a spent resin outlet, said chemical treatment subsystem configured such that the fluid flow of regenerant chemical through said at least one chemical treatment vessel and the fluid flow of said fluidized spent resin are in opposing directions.
A continuous or semi-continuous method of regenerating spent mixed bed ion-exchange resin, comprising:
- (a) backwashing spent mixed bed ion-exchange resin in a backwash subsystem to dislodge and release resin fines, particles, and cations and anions adhering to the spent mix bed resin and to fluidize the spent mix bed resin, the backwash subsystem including at least one backwash vessel in fluid communication with a make-up water supply and having a backwash outlet;
- (b) separating and isolating the fluidized mix bed resin into anion and cation exchange resins using a separation and isolation subsystem including at least one resin separation and isolation vessel in fluid communication with the backwash outlet to receive fluidized resin output from the backwash subsystem;
- (c) chemically treating separated and isolate spent anion resin and spent cation resin using regenerant chemical using a chemical treatment subsystem from the separation and isolation subsystem, the chemical treatment subsystem including at least one chemical treatment vessel having a regenerant chemical inlet for receiving a flow of regenerant chemical, and a regenerant chemical outlet, a spent resin inlet for receiving a flow of fluidized spent resin, and a spent resin outlet, said chemical treatment subsystem configured such that the fluid flow of regenerant chemical through said at least one chemical treatment vessel and the fluid flow of said fluidized spent resin are in opposing directions;
- and
- (d) repeating step (d) until the spent resin is suitable for recycling and reuse.
2 more elements
Dependencies are inferred from the claim text.