Sorbent For Selective Removal Of Contaminants From Fluids

• US 20080035564A1
• Filed: 08/09/2006
• Published: 02/14/2008
• Est. Priority Date: 08/09/2006
• Status: Abandoned Application

• Current Assignee: Solmetex, LLC
• Original Assignee: Solmetex Inc.
• Inventors: Moller, Johanna Teresia, Sylvester, Paul
• Application Number:
  US11/463,330
• Publication Number:
  US 20080035564A1
• Time in Patent Office: Days
• US Class Current: 210/638
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: B01J 20/28026 Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: B01J 47/016 Modification or after-treatment of ion-exchangers
• CPC Class Codes: C02F 1/281 using inorganic sorbents
• CPC Class Codes: C02F 1/288 using composite sorbents, e.g. coated, impregnated, multi-layered
• CPC Class Codes: C02F 2001/422 using anionic exchangers
• CPC Class Codes: C02F 2101/103 Arsenic compounds
• CPC Class Codes: C02F 2101/20 Heavy metals or heavy metal compounds
• CPC Class Codes: C02F 2101/22 Chromium or chromium compounds, e.g. chromates

Abstract

Anion exchange materials impregnated with oxygen-containing metal compounds within the exchange matrix as a sorbent, and a method for preparation. The materials remove arsenic and other ligands or contaminants from water and other fluid streams.

Claims

1. A method to impregnate an anion exchange material with a metal, the method comprising

contacting an anion exchange material with a solution of a metal in an organic solvent under conditions to impregnate the anion exchange material with a metal oxide,

contacting the dried metal oxide impregnated anion exchange material with a base for a time sufficient to precipitate a hydrous metal oxide, and

washing and neutralizing the metal oxide impregnated anion exchange material to remove excess base.

2. The method of claim 1 wherein the anion exchange material is organic or inorganic.

3. The method of claim 1 where the metal is an organic solvent soluble salt of at least one of iron, copper, zinc, nickel, manganese, titanium, zirconium, yttrium, lanthanum (and lanthanides), scandium, yttrium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, iridium, palladium, platinum, silver, gold, cadmium, gallium, indium, thallium, germanium, tin, lead, antimony, bismuth, actinium, or actinides.

6. The method of claim 1 wherein the organic solvent is at least one of methanol, ethanol, propanol, or acetone.

8. The method of claim 1 wherein a neutralized metal oxide impregnated material is used in the method to provide additional metal oxide impregnation.

9. The method of claim 1 wherein the metal oxide impregnated anion exchange material is dried at a temperature between about 19°

C. to about 150°

C.

10. The method of claim 1 wherein the base is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, or sodium bicarbonate.

11. The method of claim 2 wherein an anion exchange material is a Type I or Type II strong base organic ion exchange resin bead containing quaternary ammonium groups with a positively charged nitrogen atom.

12. The method of claim 2 wherein an anion exchange material is a weak base organic ion exchange resin bead containing primary, secondary and/or tertiary amine groups.

13. The method of claim 2 wherein an anion exchange material is at least one of a polymeric matrix or a polymeric fiber.

14. The method of claim 1 wherein an anion exchange material is at least one of a polystyrene matrix, a polystyrene/divinylbenzene matrix, or a polyacrylic matrix.

15. The method of claim 2 wherein an inorganic anion exchange material is at least one of hydrous alumina, hydrous zirconia, hydrous titania, hydrotalcites, or layered double hydroxides (LDH).

4-5. -5. (canceled)

7. (canceled)

16. A method of removing at least one contaminant from a fluid stream, the method comprising contacting at least a portion of a fluid stream with a metal oxide impregnated anion exchange material under conditions sufficient to result in a treated fluid stream with reduced contaminants, the impregnated material prepared by

contacting the anion exchange material with a solution of a metal in an organic solvent under conditions to impregnate the anion exchange material with a metal oxide,

contacting the dried metal oxide impregnated anion exchange material with a base for a time sufficient to precipitate a hydrous metal oxide, and

washing the neutralized metal oxide impregnated anion exchange material to remove excess base.

17. The method of claim 16 wherein the contaminants are selected from at least one of arsenate, arsenite, chromate, molybdate, selenite, phosphate or vanadate.

18. The method of claim 16 where the contaminant is at least one of arsenate As(V), arsenite As(III), vanadate V(V), molybdate Mo(VI), phosphate P(V), chromate or dichromate Cr(VI), selenite Se(IV), or natural organic matter.

19. The method of claim 16 where the fluid is at least one of drinking water, groundwater, industrial process water, organic solvent, mixed solvent systems, or industrial effluents.

20-27. -27. (canceled)