Iodine adsorption agent

• US 5,750,461 A
• Filed: 07/31/1995
• Issued: 05/12/1998
• Est. Priority Date: 08/20/1994
• Status: Expired due to Fees

• Current Assignee: Sud-Chemie AG (Clariant AG)
• Original Assignee: Sud-Chemie AG (Clariant AG)
• Inventors: Engelhardt, Thomas, Hahn, Reinhard
• Primary Examiner(s): McFarlane, Anthony
• Assistant Examiner(s): Ghyka, Alexander G.
• Application Number:
  US08/509,186
• Time in Patent Office: 1,016 Days
• Field of Search: 252/184, 95/90, 95/116, 95/141, 502/400, 502/407, 502/414, 502/347
• US Class Current: 502/347
• CPC Class Codes: B01D 53/68 Halogens or halogen compounds
• CPC Class Codes: B01J 20/02 comprising inorganic material
• CPC Class Codes: B01J 20/0233 Compounds of Cu, Ag, Au
• CPC Class Codes: B01J 20/28019 Spherical, ellipsoidal or cylindrical
• CPC Class Codes: B01J 20/28059 being less than 100 m2/g
• CPC Class Codes: B01J 20/28061 being in the range 100-500 m2/g
• CPC Class Codes: B01J 20/28069 Pore volume, e.g. total pore volume, mesopore volume, micropore volume
• CPC Class Codes: B01J 20/28078 Pore diameter
• 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: G21F 9/02 Treating gases

Abstract

An iodine adsorption agent is described, containing silver or a silver salt on a porous, temperature-resistant and acid-resistant organic carrier with an average pore diameter in the range from 6 to 200 nm. It has a pore diameter distribution in which 80% of the pore volume is contained in pores whose diameters lie within the range of ±50% about the average pore diameter.

Claims

1. An iodine adsorption agent comprising silver or a silver salt on a porous, temperature-resistant and acid-resistant inorganic carrier, wherein the carrier has an average pore diameter, d50, in the range from about 6 to 200 nm, and a pore diameter distribution in which about 80% of the pore volume is contained in pores whose diameters, comprising from 10% to 90% of the pore diameter distribution, d10 through d90, lie within the range of 50% around the average pore diameter.

2. The iodine adsorption agent of claim 1, wherein 80% of the pore volume is contained in pores whose pore diameter diameters, d10 through d90, lie within the range of 40% around the average pore diameter.

3. The iodine adsorption agent of claim 1, wherein the agent has a pore volume greater than approximately 0.15 cm³ /g.

4. The iodine adsorption agent of claim 1, wherein the agent has a specific surface area of approximately 30 to 150 m² /g.

5. The iodine adsorption agent of claim 1, wherein the agent contains approximately 2 to 40% by weight Ag., based on elemental silver.

6. The iodine adsorption agent of claim 1, wherein the agent contains approximately 5 to 30% by weight Ag., based on elemental silver.

7. The iodine adsorption agent of claim 1, wherein the carrier'"'"'s composition is selected from the group comprising Al₂ O₃, SiO₂, TiO₂, ZrO₂, amorphous aluminum silicate or mixtures thereof.

8. The iodine adsorption agent of claim 1, wherein the carrier is in the form of a molded object with the largest dimension of approximately 0.1 to 5 mm.

9. The iodine adsorption agent of claim 1, wherein the carrier is in the form of a molded object with the largest dimension of approximately 0.5 to 3 mm.

10. The iodine adsorption agent of claim 1, wherein the carrier has an average pore diameter, d50, in the range from about 6 to 100 mm.