Sorbent comprising spherical particles of activated carbon depositing non-crystalline compound of zirconium and process for preparing thereof

• US 4,474,853 A
• Filed: 10/18/1983
• Issued: 10/02/1984
• Est. Priority Date: 10/22/1982
• Status: Expired due to Term

• Current Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
• Original Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
• Inventors: Watanabe, Kazuhiro
• Primary Examiner(s): McCamish, Marion
• Assistant Examiner(s): Atkinson, William M.
• Application Number:
  US06/543,049
• Time in Patent Office: 350 Days
• Field of Search: 428/306.6, 428/337, 428/307.3, 428/318.4, 428/307.7, 428/403, 428/402, 428/408, 427/215, 427/337, 427/372.2, 427/376.1, 604/29
• US Class Current: 428/403
• CPC Class Codes: B01J 20/0211 Compounds of Ti, Zr, Hf
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3234 Inorganic material layers
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

Disclosed herein are a sorbent comprising spherical particles of activated carbon formed from a pitch and/or a synthetic, organic high polymer, to which a non-crystalline compound of zirconium has been deposited in an amount of 1 to 10% by weight (calculated as ZrO₂) to the weight thereof and a process for preparing the sorbent comprising the steps of impregnating the spherical particles of activated carbon with an aqueous solution of a water-soluble compound of zirconium and after treating the thus impregnated spherical particles of activated carbon with an alkali, thermally treating the thus treated spherical particles of activated carbon at a temperature of 400° to 1000° C.

Claims

1. A sorbent comprising spherical particles of activated carbon having incorporated therein 1 to 10% by weight (calculated as ZrO₂) of a non-crystalline compound of zirconium obtained by impregnating the spherical particles of activated carbon formed from a pitch and/or a synthetic, organic high polymer with an aqueous solution of a water-soluble compound of zirconium, treating the thus impregnated spherical particles of activated carbon with an alkali and thermally treating the thus treated spherical particles of activated carbon at a temperature of 400°

to 1000°

C.

2. A sorbent according to claim 1, wherein said spherical particles of activated carbon have 0.05 to 3.00 mm in diameter, 500 to 2000 m² /g in specific surface area and 0.1 to 1.3 cm³ /g in specific cumulative pore volume.

3. A sorbent according to claim 1, wherein said non-crystalline compound of zirconium does not show any diffraction lines within the range of 10°

to 60°

of Bragg'"'"'s angle of 2θ

on a X-ray diffraction pattern of the sorbent.

4. A sorbent according to claim 1, wherein said water-soluble compound of zirconium is a water-soluble zirconium halide or a water soluble salt of an oxyacid of zirconium.

5. A sorbent according to claim 1, wherein said water-soluble compound of zirconium is zirconium oxychloride.

6. A process for preparing a sorbent comprising spherical particles of activated carbon having incorporated therein 1 to 10% by weight (calculated as ZrO₂) of a non-crystalline compound of zirconium, which comprises immersing said spherical particles of activated carbon formed from a pitch and/or a synthetic, organic high polymer with an aqueous solution of a water-soluble compound of zirconium, treating the thus impregnated spherical particles of activated carbon with an alkali, and thermally treating the thus treated spherical particles of activated carbon at 400°

to 1000°

C.

7. A process for preparing a sorbent according to claim 6, wherein said water-soluble compound of zirconium is a water-soluble zirconium halide or a water-soluble salt of an oxyacid of zirconium.

8. A process for preparing a sorbent according to claim 7, wherein said water-soluble zirconium halide is one compound selected from the group consisting of ZrCl₂, ZrBr₂, ZrCl₃, ZrBr₃, ZrCl₄, ZrBr₄ and ZrI₄.

9. A process for preparing a sorbent according to claim 7, wherein said water-soluble salt of an oxyacid of zirconium is one compound selected from the group consisting of Zr(NO₃)₄.5H₂ O, Zr(SO₄)₂, ZrO(NO₃)₂.2H₂ O, Zr(SO₄)₂.2H₂ O and ZrO(SO₄).

10. A process for preparing a sorbent according to claim 6, wherein said water-soluble compound of zirconium is zirconium oxychloride.

11. A process for preparing a sorbent according to claim 6, wherein the concentration of the aqueous solution of a compound of zirconium is 3 to 60% by weight.

12. A process for preparing a sorbent according to claim 6, wherein said treatment with an alkali is carried out while using an aqueous solution of ammonia or a gaseous ammonia as an alkali.