Water purification using titanium silicate membranes

• US 6,340,433 B1
• Filed: 09/15/2000
• Issued: 01/22/2002
• Est. Priority Date: 09/15/2000
• Status: Expired due to Fees

• Current Assignee: Engelhard Corporation (BASF SE)
• Original Assignee: Engelhard Corporation (BASF SE)
• Inventors: Jacubinas, Richard M., Kuznicki, Steven M., Curran, Jacqueline S., Bell, Valerie A.
• Primary Examiner(s): FORTUNA, ANA M
• Application Number:
  US09/663,828
• Time in Patent Office: 494 Days
• Field of Search: 210/640, 210/651, 210/650, 210/500.25, 210/500.26, 95/45, 95/46, 95/52, 96/6, 427/435, 427/247, 502/60, 502/65, 502/70, 423/326
• US Class Current: 210/651
• CPC Class Codes: B01D 2323/40 in-situ membrane formation
• CPC Class Codes: B01D 2325/10 Catalysts being present on the surface of the membrane or in the pores
• CPC Class Codes: B01D 67/0051 by controlled crystallisation, e,.g. hydrothermal growth
• CPC Class Codes: B01D 71/024 Oxides
• CPC Class Codes: B01D 71/028 Molecular sieves carbon B01D71/021
• CPC Class Codes: B01D 71/0281 Zeolites
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 2101/103 Arsenic compounds
• CPC Class Codes: C02F 2101/22 Chromium or chromium compounds, e.g. chromates
• CPC Class Codes: C02F 2101/36 containing halogen

Abstract

Aqueous streams containing organic and/or inorganic contaminants are purified by the removal of the contaminant by contacting the aqueous stream with a membrane formed from a porous, crystalline titanium silicate.

Claims

1. A method for removing organic and/or inorganic contaminants from an aqueous feed stream comprising contacting said aqueous feed stream with a membrane formed from a porous, crystalline titanium silicate, recovering a permeate rich in water and forming a retentate having a contaminant concentration greater than said aqueous feed stream said titanium silicate composed of six oxygen-coordinates octahedral which are connected three dimensionally by tetrahedral silicone oxide units or bridging titanium silicate units.

2. The method of claim 1, wherein said porous crystalline titanium silicate is selected from the group consisting of ETS-4, ETS-6, ETS-10, ETAS-10 and CTS-1.

3. The method of claim 2, wherein said porous crystalline titanium silicate is ETS-4.

4. The method of claim 3, wherein said ETS-4 is ion-exchanged with barium, calcium, strontium or mixtures thereof.

5. The method of claim 2, wherein said porous crystalline titanium silicate is CTS-1.

6. The method of claim 1, wherein said porous crystalline titanium silicate has an average pore size of up to 4 Å

.

7. The method of claim 1, wherein said contaminant is an alcohol.

8. The method of claim 7, wherein said alcohol is ethanol.

9. The method of claim 1, wherein said contaminant is a halogenated solvent.

10. The method of claim 1, wherein said contaminant is an aliphatic hydrocarbon having five or more carbon atoms.

11. The method of claim 1, wherein said contaminant comprises an aromatic compound.

12. The method of claim 1, wherein said contaminant is MTBE.

13. The method of claim 1, wherein said contaminant comprises metallic compounds.

14. The method of claim 13, wherein said metallic compounds include arsenic.

15. The method of claim 13, wherein said metallic compound comprises chromium.

16. The method of claim 1, wherein said contaminant includes inorganic salts.

17. The method of claim 16, wherein said inorganic salts include chlorides, sulfates or sulfites.

18. The method of claim 1, wherein said aqueous feed stream comprises ground water.

19. The method of claim 1, wherein said aqueous feed stream comprises an industrial process stream.

20. The method of claim 1, further comprising recovering said contaminant.