IMPERMEABLE POLYMER COATING ON SELECTED HONEYCOMB CHANNEL SURFACES

• US 20140271394A1
• Filed: 03/12/2013
• Published: 09/18/2014
• Est. Priority Date: 04/05/2012
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Jiang, Dayue David, Song, Zhen, Ogunwumi, Steven Bolaji
• Granted Patent: US 9,062,586 B2
• Time in Patent Office: Days
• US Class Current: 422/180
• CPC Class Codes: B01D 2252/204 Amines
• CPC Class Codes: B01D 2253/102 Carbon
• CPC Class Codes: B01D 2253/106 Silica or silicates
• CPC Class Codes: B01D 2253/108 Zeolites
• CPC Class Codes: B01D 2253/202 Polymeric adsorbents
• CPC Class Codes: B01D 2253/204 Metal organic frameworks (MOF's)
• CPC Class Codes: B01D 2253/3425 Honeycomb shape
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 2258/05 Biogas
• CPC Class Codes: B01D 2258/06 Polluted air
• CPC Class Codes: B01D 2259/65 Employing advanced heat integration, e.g. Pinch technology
• CPC Class Codes: B01D 53/0438 Cooling or heating systems
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/82 with stationary reactants
• CPC Class Codes: B01J 20/28045 Honeycomb or cellular structures; Solid foams or sponges
• CPC Class Codes: B01J 20/28097 being coated, filled or plugged with specific compounds
• CPC Class Codes: F01N 13/16 Selection of particular materials
• CPC Class Codes: F01N 2330/20 Plastics, e.g. polymers, polyester, polyurethane
• CPC Class Codes: F01N 2510/06 : for exhaust purification, e.g. catalytic reaction
• CPC Class Codes: F01N 2570/10 : Carbon or carbon oxides
• CPC Class Codes: F01N 3/2828 : Ceramic multi-channel monoliths, e.g. honeycombs
• CPC Class Codes: Y02A 50/20 : Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 : of CO2

Abstract

Absorbent structures for CO₂ capture include a honeycomb substrate having partition walls that extend through the honeycomb substrate. The partition walls have channel surfaces that define a plurality of individual channels including a plurality of reaction channels and a plurality of heat-exchange channels. The reaction channels and the heat-exchange channels are arranged such that individual reaction channels are in thermal communication with individual heat-exchange channels. Surfaces of the reaction channels surfaces include a sorbent material, and surfaces of the heat-exchange channels include a coating layer. The coating layer includes a water-impermeable layer formed from a polymer material. The polymer material of the water-impermeable layer does not substantially penetrate into the sorbent material of the partition walls or of the reaction-channel surfaces. Methods for forming the absorbent structures include coating the surfaces of the heat-exchange channels with the polymer material using a liquid composition such as an aqueous polymer emulsion.

Claims

1. An absorbent structure for CO₂ capture comprising:

a honeycomb substrate having partition walls that extend through the honeycomb substrate in an axial direction from an inlet surface of the honeycomb substrate to an outlet surface of the honeycomb substrate opposite the inlet surface, the partition walls having channel surfaces that define a plurality of individual channels,

wherein;

the plurality of individual channels comprise a plurality of reaction channels and a plurality of heat-exchange channels, whereby the channel surfaces of the reaction channels are reaction-channel surfaces and the channel surfaces of the heat-exchange channels are exchange-channel surfaces;

the reaction channels and the heat-exchange channels are arranged such that individual reaction channels are in thermal communication with individual heat-exchange channels;

the reaction-channel surfaces comprise a sorbent material;

the exchange-channel surfaces comprise at least one coating layer; and

the at least one coating layer comprises a water-impermeable layer formed from a polymer material selected from the group consisting of poly(vinyl butyral) resins, polyacrylates, polynitriles, polychloroprenes, poly(vinyl chloride), poly(vinylidene fluoride), polyolefins, poly(tetrafluoroethylene), silicones, polyurethanes, mixtures thereof, and composites thereof; and

the polymer material of the water-impermeable layer does not substantially penetrate into the partition walls that form the exchange-channel surfaces.

2. The absorbent structure of claim 1, wherein the honeycomb substrate is formed from the sorbent material.

3. The absorbent structure of claim 1, wherein the sorbent material is selected from the group consisting of zeolites, Metallic Organic Frameworks, clays, layered double hydroxides, solid amines, alkali metal oxides, alkaline earth metal oxides, silicon carbide, mullite, alumina, aluminum titanate, carbon, and composites containing any of these.

4. The absorbent structure of claim 1, wherein the honeycomb substrate is formed from a ceramic material other than the sorbent material, and the ceramic material is loaded with the sorbent material during or after the formation of the honeycomb substrate.

5. The absorbent structure of claim 1, wherein the honeycomb substrate has a cell density of from about 100 to about 2000 individual channels per square inch of the inlet surface.

6. The absorbent structure of claim 1, wherein the at least one coating layer further comprises at least one additional layer overlying the water-impermeable layer, the at least one additional layer comprising a polymer material different from the polymer material of the water-impermeable layer.

7. The absorbent structure of claim 6, wherein the polymer material of the at least one additional layer comprises polystyrene or an epoxy resin.

8. The absorbent structure of claim 7, wherein the water-impermeable layer is a poly(vinyl butyral) resin.

9. A method for forming an absorbent structure for CO₂ capture, the method comprising:

providing a honeycomb substrate formed from a sorbent material, the honeycomb substrate having partition walls that extend through the honeycomb substrate in an axial direction from an inlet surface of the honeycomb substrate to an outlet surface of the honeycomb substrate opposite the inlet surface, the partition walls having channel surfaces that define a plurality of individual channels, the plurality of individual channels comprising a plurality of reaction channels and a plurality of heat-exchange channels, whereby the channel surfaces of the reaction channels are reaction-channel surfaces and the channel surfaces of the heat-exchange channels are exchange-channel surfaces;

masking inlet ends and outlet ends of each of the reaction channels to form masked reaction channels;

delivering a first aqueous polymer emulsion onto the inlet surface of the honeycomb substrate to cause the first aqueous polymer emulsion to flow through each of the heat-exchange channels and not to flow through the masked reaction channels, thereby forming a first emulsion coating of the first aqueous polymer emulsion over the exchange-channel surfaces only; and

drying the first emulsion coating to form a water-impermeable layer on the exchange-channel surfaces,

wherein;

the water-impermeable layer comprises a polymer material selected from the group consisting of poly(vinyl butyral) resins, polyacrylates, polynitriles, polychloroprenes, poly(vinyl chloride), poly(vinylidene fluoride), polyolefins, poly(tetrafluoroethylene), silicones, polyurethanes mixtures thereof, and composites thereof; and

the polymer material of the water-impermeable layer does not substantially penetrate into the partition walls that form the exchange-channel surfaces.

10. The method of claim 9, wherein the first aqueous polymer emulsion comprises particles of the polymer material or uncured monomers that form the polymer material when cured.

11. The method of claim 10, wherein the first aqueous polymer emulsion comprises particles of the polymer material having a median particle size of from 0.1 μ

m to 20 μ

m.

12. The method of claim 9, wherein the first aqueous polymer emulsion has a viscosity of from 50 cP to 5000 cP at 25°

C.

13. The method of claim 9, wherein the first aqueous polymer emulsion has a solids content of from 10% to 50% by weight, based on the total weight of the first aqueous polymer emulsion.

14. The method of claim 9, wherein the honeycomb substrate has a cell density of from about 100 to about 2000 individual channels per square inch of the inlet surface and the first aqueous polymer emulsion has a viscosity of from 50 cP to 5000 cP at 25°

C.

15. The method of claim 9, further comprising:

delivering a second aqueous polymer emulsion onto the inlet surface of the honeycomb substrate to cause the second aqueous polymer emulsion to flow through each of the heat-exchange channels and not to flow through the masked reaction channels, thereby forming a second emulsion coating of the second aqueous polymer emulsion over the water-impermeable layer; and

drying the second emulsion coating of the second aqueous polymer emulsion to form at least one additional layer as a topcoat overlying the water-impermeable layer.

16. The method of claim 15, wherein the topcoat comprises a polymer material selected from the group consisting of polystyrene and epoxy resins.

17. A method for forming an absorbent structure for CO₂ capture, the method comprising:

providing a honeycomb substrate formed from a ceramic material and loaded with a sorbent material, the honeycomb substrate having partition walls that extend through the honeycomb substrate in an axial direction from an inlet surface of the honeycomb substrate to an outlet surface of the honeycomb substrate opposite the inlet surface, the partition walls having channel surfaces that define a plurality of individual channels, the plurality of individual channels comprising a plurality of reaction channels and a plurality of heat-exchange channels, whereby the channel surfaces of the reaction channels are reaction-channel surfaces and the channel surfaces of the heat-exchange channels are exchange-channel surfaces;

masking inlet ends and outlet ends of each of the reaction channels to form masked reaction channels;

delivering a first aqueous polymer emulsion onto the inlet surface of the honeycomb substrate to cause the first aqueous polymer emulsion to flow through each of the heat-exchange channels and not to flow through the masked reaction channels, thereby forming a first emulsion coating of the first aqueous polymer emulsion over the exchange-channel surfaces only; and

drying the emulsion coating to form a water-impermeable layer over the exchange-channel surfaces,

wherein;

the water-impermeable layer comprises a polymer material selected from the group consisting of poly(vinyl butyral) resins, polyacrylates, polynitriles, polychloroprenes, poly(vinyl chloride), poly(vinylidene fluoride), polyolefins, poly(tetrafluoroethylene), silicones, polyurethanes mixtures thereof, and composites thereof; and

the polymer material of the water-impermeable layer does not substantially penetrate into the partition walls that form the exchange-channel surfaces.

18. The method of claim 17, wherein the aqueous polymer emulsion comprises uncured monomers that form the polymer material when cured or particles of the polymer material having a median particle size of from 0.1 μ

m to 20 μ

m.

19. The method of claim 17, further comprising:

washcoating the honeycomb substrate with the sorbent material to load the honeycomb substrate with the sorbent material before delivering the first aqueous polymer emulsion.

20. The method of claim 17, further comprising:

delivering a second aqueous polymer emulsion onto the inlet surface of the honeycomb substrate to cause the second aqueous polymer emulsion to flow through each of the heat-exchange channels and not to flow through the masked reaction channels, thereby forming a second emulsion coating of the second aqueous polymer emulsion over the water-impermeable layer; and

drying the second emulsion coating of the second aqueous polymer emulsion to form at least one additional layer as a topcoat overlying the water-impermeable layer.