Solid filtration media incorporating elevated levels of permanganate and water

• US 6,004,522 A
• Filed: 07/02/1997
• Issued: 12/21/1999
• Est. Priority Date: 12/15/1993
• Status: Expired due to Term

• Current Assignee: Purafil, Inc. (FGI Equity LLC)
• Original Assignee: Purafil, Inc. (FGI Equity LLC)
• Inventors: England, William G.
• Primary Examiner(s): Griffin, Steven P.
• Assistant Examiner(s): DI MAURO, PETER T
• Application Number:
  US08/887,449
• Time in Patent Office: 902 Days
• Field of Search: 423/210, 423/224, 423/230, 422/4, 422/5, 210/758, 95/136
• US Class Current: 423/230
• CPC Class Codes: B01D 2253/104 Alumina
• CPC Class Codes: B01D 2257/304 Hydrogen sulfide
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/0222 Compounds of Mn, Re
• CPC Class Codes: B01J 20/04 comprising compounds of alkali metals, alkaline earth metals or magnesium
• CPC Class Codes: B01J 20/043 Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite
• CPC Class Codes: B01J 20/08 comprising aluminium oxide or hydroxide; comprising bauxite
• CPC Class Codes: B01J 20/28014 characterised by their form
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: B01J 2220/42 Materials comprising a mixture of inorganic materials materials coated or impregnated on a carrier B01J20/32

Abstract

An improved filtration media, method of preparing the media, and method of treating a fluid stream with the media are disclosed. The improved media comprises a substrate having elevated levels of permanganate and water in one embodiment. More specifically, the improved media comprises a porous substrate impregnated with at least approximately 5% permanganate, and at least approximately 10% water, by weight. In another embodiment, the media further comprises sodium bicarbonate. Improved efficiency of removal of undesirable compounds such as hydrogen sulfide is achieved.

Claims

1. A method of treating a contaminated fluid stream containing hydrogen sulfide, comprising contacting the contaminated fluid stream with a solid filtration composition such that the hydrogen sulfide is removed from the contaminated fluid stream,

wherein the solid filtration composition consists essentially of at least approximately 7% potassium permanganate by weight of the composition;

at least approximately 10% water by weight of the composition;

sodium bicarbonate, and activated alumina.

2. The method of claim 1, wherein the concentration of potassium permanganate is between approximately 7 and 12% by weight of the composition.

3. The method of claim 1, wherein the concentration of sodium bicarbonate is approximately 30% by weight of the composition or less.

4. The method of claim 1, wherein the concentration of sodium bicarbonate is between approximately 15 and 20% by weight of the composition.

5. The method of claim 1, wherein the water concentration is between 10% and 35%.

6. The method of claim 1, wherein the hydrogen sulfide capacity of the solid filtration composition is at least 13%.

7. A method of treating a contaminated fluid stream containing hydrogen sulfide, comprising contacting the contaminated fluid stream with a solid filtration composition such that the hydrogen sulfide is removed from the contaminated fluid stream,

wherein the solid filtration composition is produced by the process comprising the steps of:

forming a mixture consisting essentially of water, potassium permanganate, sodium bicarbonate, and activated alumina;

forming the mixture into at least one cohesive porous unit; and

curing the unit at a temperature of from about 100°

F. to about 200°

F., until the concentration of water is at least approximately 10% by weight of the composition, and the concentration of potassium permanganate is at least about 7% by weight of the composition.

8. The method of claim 7, wherein the unit is cured until the concentration of potassium permanganate is from about 7% to about 12% by weight of the composition.

9. The method of claim 7, wherein the unit is cured until the concentration of potassium permanganate is from about 7% to about 12% by weight of the composition, and the concentration of sodium bicarbonate is between approximately 15 and 20% by weight of the composition.

10. The method of claim 7, wherein the unit is cured until the concentration of sodium bicarbonate is approximately 30% by weight of the composition or less.

11. The method of claim 7, wherein the water concentration is between 10% and 35%.

12. The method of claim 7, wherein the hydrogen sulfide capacity of the solid filtration composition is at least 13%.