Material And Process For The Filtration Of Nitric Acid And NO2 From Streams Of Air

• US 20070245895A1
• Filed: 06/15/2007
• Published: 10/25/2007
• Est. Priority Date: 06/14/2004
• Status: Active Grant

• Current Assignee: Guild Associates Incorporated
• Original Assignee: Guild Associates Incorporated
• Inventors: Rossin, Joseph, Feaver, William
• Granted Patent: US 7,678,182 B2
• Time in Patent Office: Days
• US Class Current: 96/4
• CPC Class Codes: B01D 2253/108 Zeolites
• CPC Class Codes: B01D 53/565 by treating the gases with solids
• CPC Class Codes: B01J 20/186 Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
• CPC Class Codes: B01J 20/3021 Milling, crushing or grinding
• CPC Class Codes: B01J 20/3042 Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent
• 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 20/3248 the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
• CPC Class Codes: B01J 20/3251 comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
• CPC Class Codes: B01J 2220/42 Materials comprising a mixture of inorganic materials materials coated or impregnated on a carrier B01J20/32
• CPC Class Codes: B01J 2220/56 Use in the form of a bed
• 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
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A material for filtering NO₂ and nitric acid vapors from air over a wide range of humidities and temperatures including a porous hydrophobic substrate and an amine is provided.

Claims

1. A material for filtering NO₂ and nitric acid vapors from air over wide range of humidities and temperatures, comprising:

a porous hydrophobic substrate and an amine.

2. The material of claim 1, wherein the porous hydrophobic substrate comprises a zeolite from the pentisil family.

3. The material of claim 1, wherein the porous hydrophobic substrate comprises predominantly ZSM-5.

4. The material of claim 1, wherein the porous hydrophobic substrate comprises predominantly ZSM-8.

5. The material of claim 1, wherein the porous hydrophobic substrate comprises predominantly ZSM-11.

6. The material of claim 1, wherein the porous hydrophobic substrate comprises predominantly of an acidified form of a zeolite from the pentisil family.

7. The material of claim 1, wherein the material comprises from about 0.001% to about 20% by weight an amine selected from the group consisting of a primary amine, a secondary amine, an amine possessing both a primary and a secondary amine functional group, and mixtures thereof.

8. The material of claim 1, wherein the amine comprises at least one R—

NHCH₃ functional group.

9. The material of claim 1 wherein the amine comprises an amine salt.

10-20. -20. (canceled)