Gamma irradiation of ion exchange resins to remove or trap halogenated impurities

Patent metadata

Field	Value
Publication number	US-10882965-B2
Application number	US-201615759866-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Sep 16, 2015
Publication date	Jan 5, 2021
Grant date	Jan 5, 2021

Abstract

A method of producing treated ion exchange resin material includes exposing an enclosed vessel containing ion exchange resin and a pre-treatment solution to high energy radiation. The treated ion exchange resin material has reduced organic impurities or total organic carbon (TOC).

First claim

The invention claimed is:

1. A method of producing a treated ion exchange resin material, comprising:
providing ion exchange resin having of organic impurities in a vessel comprising a pre-treatment solution and a void space; and
exposing the ion exchange resin, the pre-treatment solution, and the void space within the vessel to high energy radiation to produce a treated ion exchange resin material having reduced organic impurities and a treated void space having reduced volatile organic species.

2. The method of claim 1 , wherein the high energy radiation is gamma irradiation.

3. The method of claim 1 , wherein the pre-treatment solution is purified water.

4. The method of claim 2 , wherein a source of gamma irradiation is cobalt 60.

5. The method of claim 1 , further comprising washing the treated ion exchange resin material to remove at least some soluble organic impurities from the treated ion exchange resin material.

6. The method of claim 1 , wherein the organic impurities comprise one or more of organochloride compounds, organosulfonate compounds, and total organic carbon compounds.

7. The method of claim 6 , wherein the organic impurities are selected from the group consisting of:

and combinations thereof.

8. The method of claim 7 , wherein the high intensity radiation produces the treated ion exchange resin material comprising less than about 10,000 ion intensity counts of the compound of formula (1).

9. The method of claim 2 , wherein the gamma irradiation is in a range of about 1 Gy to about 1 MGy.

10. The method of claim 9 , wherein the gamma irradiation is in a range of about 0.1 KGy to about 1 MGy.

11. The method of claim 10 , wherein the gamma irradiation is in a range of about 25 KGy to about 75 KGy.

Assignees

• Evoqua Water Tech Llc

Inventors

• Wilkes Marty

Classifications

• B01J47/04

  Mixed-bed processes · CPC title

• B01J47/06

  during which the ion-exchange material is subjected to a physical treatment, e.g. heat, electric current, irradiation or vibration (electrodialysis or electro-osmosis B01D61/42) · CPC title

• B01J41/05

  in the strongly basic form · CPC title

• B01J39/05

  in the strongly acidic form · CPC title

• C02F2103/023

  Water in cooling circuits · CPC title