Aldehyde gas absorbent and process for absorbing aldehyde gas

• US 6,540,936 B1
• Filed: 06/19/2000
• Issued: 04/01/2003
• Est. Priority Date: 06/19/2000
• Status: Active Grant

• Current Assignee: Toagosei Company Limited
• Original Assignee: Toagosei Company Limited
• Inventors: Takagi, Osamu, Yamamoto, Noriyuki, Hirukawa, Toshio
• Primary Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US09/597,421
• Time in Patent Office: 1,016 Days
• Field of Search: 252/184, 252/194, 252/181.1, 252/181.3, 252/190
• US Class Current: 252/184
• CPC Class Codes: B01D 2251/21 Organic compounds not provided for in groups B01D2251/206 or B01D2251/208
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/72 Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
• CPC Class Codes: B01J 20/103 comprising silica
• CPC Class Codes: B01J 20/28028 Particles immobilised within fibres or filaments
• CPC Class Codes: B01J 20/2803 Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/28057 Surface area, e.g. B.E.T specific surface area
• CPC Class Codes: B01J 20/2808 being less than 2 nm, i.e. micropores or nanopores
• CPC Class Codes: B01J 20/28083 being in the range 2-50 nm, i.e. mesopores
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3272 Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
• CPC Class Codes: B01J 20/3293 Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers
• CPC Class Codes: B01J 20/3297 Coatings in the shape of a sheet

Abstract

An aldehyde gas absorbent comprising: a porous silicon dioxide having a specific surface area of from 400 to 900 m²/g and an average pore size of from 0.1 to 10 nm; and a polyamine compound carried on the porous silicon dioxide in an amount of from 0.02 to 2.0 mmol/g, said polyamine compound being represented by the following formula:

H₂N—(CH₂CH₂—NH)_n—CH₂CH₂NH₂

wherein n stands for an integer of from 0 to 3. Also disclosed are a process for absorbing an aldehyde gas and an aldehyde gas-absorbing article using the aldehyde gas absorbent.

Claims

1. An aldehyde gas absorbent comprising:

a porous silicon dioxide having a specific surface area of from 400 to 900 m²/g and an average pore size of from 0.1 to 10 nm; and

a polyamine compound carried on the porous silicon dioxide in an amount of from 0.02 to 2.0 mmol/g, said polyamine compound being represented by the following formula;

2. An aldehyde gas-absorbing article comprising a medium and an aldehyde gas absorbent as claimed in claim 1.

3. The aldehyde gas-absorbing article according to claim 2, wherein said medium is wall paper.

4. The aldehyde gas-absorbing article according to claim 2, wherein said medium is a liquid coating composition.

5. The aldehyde gas-absorbing article according to claim 2, wherein said medium is fiber.

6. The aldehyde gas-absorbing article according to claim 2, wherein said medium is paper.

7. The aldehyde gas-absorbing article according to claim 2, wherein said medium is leather.

8. The aldehyde gas-absorbing article according to claim 2, wherein said medium is plywood.

9. The aldehyde gas-absorbing article according to claim 2, wherein said medium is a spray agent.