Composite adsorbent and process for producing same

• US 5,231,063 A
• Filed: 04/10/1991
• Issued: 07/27/1993
• Est. Priority Date: 04/16/1990
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Inventors: Sugiura, Masahiro, Fukumoto, Kazuhiro
• Primary Examiner(s): Konopka, Paul E.
• Application Number:
  US07/683,317
• Time in Patent Office: 839 Days
• Field of Search: 55/387, 55/524, 55/526, 55/527, 131/331, 131/297, 131/342, 428/240, 428/244, 502/401, 502/62, 502/417, 252/190
• US Class Current: 502/62
• CPC Class Codes: B01D 2257/304 Hydrogen sulfide
• CPC Class Codes: B01D 2257/306 Organic sulfur compounds, e.g. mercaptans
• CPC Class Codes: B01D 2257/406 Ammonia
• CPC Class Codes: B01D 2257/704 Solvents not covered by groups B01D2257/702 - B01D2257/7027
• 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 20/0225 Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
• CPC Class Codes: B01J 20/0237 Compounds of Cu
• CPC Class Codes: B01J 20/0288 Halides of compounds other than those provided for in B01J20/046
• CPC Class Codes: B01J 20/12 Naturally occurring clays or bleaching earth
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/22 comprising organic material
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/28016 Particle form
• CPC Class Codes: B01J 20/28023 Fibres or filaments fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence
• CPC Class Codes: B01J 20/28033 Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 20/28045 Honeycomb or cellular structures; Solid foams or sponges
• 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 20/3246 having a well defined chemical structure
• CPC Class Codes: B01J 20/3251 comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
• CPC Class Codes: B01J 20/3253 : comprising a cyclic structure not containing any of the heteroatoms nitrogen, oxygen or sulfur, e.g. aromatic structures
• CPC Class Codes: B01J 2220/44 : Materials comprising a mixture of organic materials materials coated or impregnated on a carrier B01J20/32
• CPC Class Codes: B01J 2220/46 : Materials comprising a mixture of inorganic and organic materials materials coated or impregnated on a carrier B01J20/32
• CPC Class Codes: B01J 2220/4812 : the starting material being of organic character
• CPC Class Codes: Y10T 428/24149 : Honeycomb-like
• CPC Class Codes: Y10T 428/249953 : Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/30 : Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 442/2508 : Coating or impregnation absorbs chemical material other than water

Abstract

A composite adsorbent comprising an acid salt of an m- or p-aromatic amino acid and an acid. The adsorbent may further contain a transition metal compound. The former removes aldehydes, ammonias and amines simultaneously, and the latter further removes hydrogen sulfide.

The composite adsorbent is used in the form of a powder, a solution, or a solid supported on a carrier.

Claims

1. A composite adsorbent for removing offensive odors from a gas comprising as active ingredients at least one acid salt selected from the group consisting of acid salts of a m-aromatic amino acid and a p-aromatic amino acid, and at least one acid and at least one transition metal compound.

2. A composite adsorbent as claimed in claim 1, wherein the aromatic amino acid is an aromatic monoamino-monocarboxylic acid.

3. A composite adsorbent as claimed in claim 2, wherein the aromatic monoamino-monocarboxylic acid is one selected from the group consisting of a m-aminobenzoic acid, a p-aminobenzoic acid and a p-aminosalicylic acid.

4. A composite adsorbent as claimed in claim 1, wherein the acid is an inorganic acid.

5. A composite adsorbent as claimed in claim 4, wherein the inorganic acid is a member selected from the group consisting of a hydrochloric acid, a nitric acid, a sulfuric acid, a phosphoric acid, and a pyrophosphoric acid.

6. A composite adsorbent as claimed in claim 1, wherein the acid is an organic acid.

7. A composite adsorbent as claimed in claim 6, wherein the organic acid is a member selected from the group consisting of a citric acid, a malonic acid, a malic acid, and an oxalic acid.

8. A composite adsorbent as claimed in claim 1, wherein the transition metal compound is a member selected from the group consisting of salts of arsenic, mercury, copper, antimony, bismuth, tin, cadmium, lead, zinc, cobalt, nickel, iron and manganese.

9. A composite adsorbent as claimed in claim 1, wherein the transition metal compound is a member selected from the group consisting of a nitrate, a sulfate, a carbonate, a phosphate, a pyrophosphate, a chloride, a bromide, and a fluoride.

10. A composite adsorbent as claimed in claim 1, wherein the active ingredients are supported uniformly on a porous carrier.

11. A composite adsorbent as claimed in claim 10, wherein the porous carrier is a member selected from the group consisting of inorganic porous carriers of sepiolite, palygorskite, activated carbon, zeolite, activated carbon fiber, activated alumina, sepiolite-mixed paper, silica gel, activated clay, vermiculite, and diatomaceous earth, and organic porous carriers of pulp, fibers, cloth, and a polymeric cellular body.

12. A composite adsorbent as claimed in claim 10, wherein the active ingredients are supported on the porous carrier in the amount of 0.1-30 wt% of the porous carrier.

13. A composite adsorbent as claimed in claim 1, wherein the active ingredients are supported uniformly on a porous carrier.

14. A composite adsorbent as claimed in claim 13, wherein the active ingredients are supported on the porous carrier in the amount of 0.1-30 wt% of the porous carrier.