Process for impregnating active carbon with iodine compounds

• US 4,075,282 A
• Filed: 01/22/1976
• Issued: 02/21/1978
• Est. Priority Date: 02/22/1975
• Status: Expired due to Term

• Current Assignee: Laboratorium Fur Adsorptionstechnik GmbH
• Original Assignee: Laboratorium Fur Adsorptionstechnik GmbH
• Inventors: Hohmann, Volker, Wirth, Hans, Storp, Klaus, Rittinger, Gunter
• Primary Examiner(s): Garvin, Patrick P.
• Assistant Examiner(s): Wright, William G.
• Application Number:
  US05/651,350
• Time in Patent Office: 761 Days
• Field of Search: 252/429 R, 252/441, 252/444, 423/230, 423/244
• US Class Current: 423/230
• 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: B01D 53/52 Hydrogen sulfide
• CPC Class Codes: B01D 53/8609 Sulfur oxides
• CPC Class Codes: B01J 20/046 containing halogens, e.g. halides
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/28064 being in the range 500-1000 m2/g
• CPC Class Codes: B01J 20/3085 Chemical treatments not covered by groups B01J20/3007 - B01J20/3078
• 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 20/3289 Coatings involving more than one layer of same or different nature
• CPC Class Codes: B01J 2220/56 Use in the form of a bed
• CPC Class Codes: B01J 2220/606 parallel disposed columns
• CPC Class Codes: B01J 2220/64 In a syringe, pipette, e.g. tip or in a tube, e.g. test-tube or u-shape tube in columns B01J2220/58

Abstract

A process for the impregnation of active carbon with an iodine compound in which the solution is also provided with a reducing agent preferably hydrazine or a compound capable of decomposing to produce sulfur dioxide (e.g. a sulfite or hydrogen sulfite) or solubilized sulfur dioxide. The impregnated active carbon can be used for the removal of sulfur dioxide or hydrogen sulfide from a gas stream.

Claims

1. A process for the removal of sulfur dioxide or hydrogen sulfide from a gas stream which comprises the steps of:

a. impregnating in a static state an active-carbon bed with an aqueous solution containing iodine or a water-soluble iodide salt and a reducing agent soluble in said solution and selected from the group which consists of sulfur dioxide, alkali metal sulfites, alkali metal hydrogen sulfites and hydrazine, the quantity of said reducing agent being at least the equivalent of the reducing capabilities of 3 grams of SO₂ per liter; and

b. thereafter passing said gas through the impregnated bed.

2. The process defined in claim 1 wherein said reducing agent is present in said solution in a quantity at least sufficient to stoichiometrically react with oxidizing substances contained within and adsorbed on the carbon of said bed.

3. The process defined in claim 1 wherein said reducing agent is selected from the group which consists of compounds producing sulfur dioxide upon decomposition.

4. The process defined in claim 1 wherein said reducing agent is sodium sulfite or bisulfite.