Composite Material for Air Purification, Preparation Method therefor and Application thereof

• US 20190201823A1
• Filed: 08/18/2017
• Published: 07/04/2019
• Est. Priority Date: 09/09/2016
• Status: Active Grant

• Current Assignee: Climasys Datasmart Technology Co.,Ltd.
• Original Assignee: Climasys Datasmart Technology Co.,Ltd.
• Inventors: YE, Yang
• Granted Patent: US 10,780,379 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 2239/0407 comprising particulate additives, e.g. adsorbents apparatus incorporating gas filtering material B01D46/0036
• CPC Class Codes: B01D 2239/0464 Impregnants
• CPC Class Codes: B01D 2239/1216 Pore size
• CPC Class Codes: B01D 2239/1241 Particle diameter
• CPC Class Codes: B01D 2251/304 of sodium
• CPC Class Codes: B01D 2251/404 of calcium
• CPC Class Codes: B01D 2251/604 Hydroxides
• CPC Class Codes: B01D 2251/606 Carbonates
• CPC Class Codes: B01D 2252/202 Alcohols or their derivatives
• CPC Class Codes: B01D 2253/106 Silica or silicates
• CPC Class Codes: B01D 2253/11 Clays
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2257/80 Water
• CPC Class Codes: B01D 2258/06 Polluted air
• CPC Class Codes: B01D 2259/4508 for cleaning air in buildings
• CPC Class Codes: B01D 2279/40 for cleaning of environmental air, e.g. by filters installed on vehicles or on streets
• CPC Class Codes: B01D 39/1676 of synthetic origin
• CPC Class Codes: B01D 46/0036 by adsorption or absorption
• CPC Class Codes: B01D 46/2411 Filter cartridges
• 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 53/04 : with stationary adsorbents B01D53/025 takes precedence
• CPC Class Codes: B01D 53/261 : by adsorption
• CPC Class Codes: B01D 53/263 : by absorption
• CPC Class Codes: B01D 53/502 : characterised by a specific solution or suspension
• CPC Class Codes: B01D 53/504 : characterised by a specific device
• CPC Class Codes: B01D 53/508 : by treating the gases with solids
• CPC Class Codes: B01D 53/78 : with gas-liquid contact
• CPC Class Codes: B01D 53/82 : with stationary reactants
• CPC Class Codes: B01J 20/041 : Oxides or hydroxides
• CPC Class Codes: B01J 20/043 : Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite
• CPC Class Codes: B01J 20/14 : Diatomaceous earth
• CPC Class Codes: B01J 20/22 : comprising organic material
• CPC Class Codes: B01J 20/24 : Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
• CPC Class Codes: B01J 20/261 : obtained by reactions only involving carbon to carbon unsaturated bonds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F
• CPC Class Codes: B01J 20/262 : obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds per se C08G
• CPC Class Codes: B01J 20/28026 : Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin
• CPC Class Codes: B01J 20/28045 : Honeycomb or cellular structures; Solid foams or sponges
• 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 20/3212 : consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
• CPC Class Codes: B01J 20/3223 : by means of an adhesive agent
• CPC Class Codes: B01J 20/3236 : containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts

Abstract

A composite material for purifying air includes a porous foam material which is an open-cell polyurethane foam net; and a mixture sprayed on the interior and/or the surface of the porous foam material, the mixture including an absorbent material, a treating agent and an adhesive; wherein the adsorptive material is diatomite, and the treating agent is alkali solution.

Claims

1. A composite material for purifying air, the composite material comprising:

a porous foam material, which is an open-cell polyurethane foam net; and

a mixture sprayed on the interior and/or surface of the porous foam material, comprising an adsorptive material, a treating agent and an adhesive;

wherein the adsorptive material is diatomite, and the treating agent is alkali solution.

2. The composite material according to claim 1, wherein the adhesive is selected from one or more of epoxy resin adhesive, butadiene acrylic copolymer adhesive, polyvinyl acetate adhesive, acrylic adhesive, polyurethane adhesive and polyacrylate adhesive, optionally, the adhesive is butadiene acrylic copolymer adhesive;

and/or

the porous foam material has a pore number of 30 to 60 meshes, optionally 40 to 50 meshes, and further optionally 45 meshes; and

/or

the granularity of the adsorptive material is 60-300 meshes; and

/or

the alkali solution is an aqueous solution having a concentration of alkali of 5 wt % to 50 wt %, optionally 30 wt % to 50 wt %; and

/or

the spraying amount of the mixture is 200 g/m² to 250 g/m², optionally 225 g/m², with respect to the outer surface of the porous foam material per square metre; and

/or

the alkali is selected from one or more of sodium hydroxide, calcium hydroxide and sodium carbonate.

3. The composite material according to claim 1, wherein the weight ratio of the adsorptive material, the treating agent and the adhesive in the mixture is 1:

5-7;

1.3-1.7, preferably 1;

6;

1.5.

4. The composite material according to claim 1, wherein the mixture further comprises a suspending agent, optionally the suspending agent is a 2 wt % to 5 wt % sodium carboxymethyl cellulose aqueous solution, and further optionally the suspending agent is 5 wt % to 10 wt % of the total weight of the mixture.

5. The composite material according to claim 1, further comprising a humectant sprayed on the interior and/or surface of the porous foam material to which the mixture has been sprayed, optionally the humectant is glycerol, optionally the amount of the humectant is 3 wt % to 5 wt % of the total weight of the mixture.

6. A method of preparing a composite material for purifying air according to claim 1, the method comprising:

dissolving alkali in water to obtain a treating agent;

uniformly mixing the adsorptive material and the treating agent to obtain a primary mixture;

adding the adhesive into the primary mixture and uniformly mixing to obtain a mixture;

optionally, adding a suspending agent into the mixture and uniformly mixing;

spraying the mixture or the mixture containing the suspending agent onto the porous foam material to produce a composite material; and

optionally, uniformly spraying the humectant onto the composite material.

7. A composite material for purifying air prepared according to the method of claim 6.

8. A method of purifying air, the method comprising:

optionally, performing primary efficiency filtration on the air to be purified to filter out particles with a particle size larger than 5 m in the air;

controlling the relative humidity of the air to be purified at 50% to 90%, optionally 50% to 75%, and further optionally 75%;

passing air having a controlled relative humidity through the composite material according to claim 1; and

optionally, performing medium efficiency filtration on the air passing through the composite material to filter out particles with a particle size of 1-5 m in the air.

9. The method according to claim 8, wherein the method is used to treat acidic gas in the air, optionally the acidic gas having no more than 1000 ppb of sulfur dioxide content.

10. The method according to claim 8, wherein in the step of controlling the relative humidity, the relative humidity is controlled by a humidity sensor on the air inlet side and a humidity controller connected to the humidity sensor, as well as a humidifying device connected to the humidity controller.

11. An apparatus for purifying air, the apparatus comprising:

a closed shell provided with an air inlet at one end of the shell and an air outlet at the other end of the shell;

a humidifying unit disposed inside the closed shell, the humidifying unit being located downstream of the air inlet, and including a humidity sensor, and a humidity controller connected to the humidity sensor, as well as a humidifying device connected to the humidity controller, the humidifying unit being provided to control the relative humidity of air at 50% to 90%, optionally 50% to 75%, and further optionally 75%;

a chemical processing unit disposed inside the closed shell, the chemical processing unit being located downstream of the humidifying unit and comprising the composite material according to claim 1, the chemical processing unit being provided to treat air having a controlled relative humidity to remove acidic gas in the air; and

a fan disposed inside the closed shell, the fan being located downstream of the chemical processing unit and provided to allow air to pass through the apparatus for purifying air at a certain wind speed;

an optional primary efficiency filtering unit, if present, being disposed inside the closed shell, and the primary efficiency filtering unit being located downstream of the air inlet and upstream of the humidifying unit, and being provided to filter out particles with a particle size greater than 5 μ

m;

an optional medium efficiency filtering unit, if present, being disposed inside the closed shell, the medium efficiency filtering unit being located downstream of the chemical processing unit and upstream of the fan, and being disposed to filter out particles with a particle size of 1 to 5 μ

m from the air.

12. The apparatus according to claim 11, wherein the chemical processing unit comprises one or more hollow cylinders formed of the composite material, one end of which is sealed and the other end is opened as an air outlet side, so that air passes through a side wall of the hollow cylinder and enters a hollow portion of the hollow cylinder, and then flows out from an air outlet side.

13. The apparatus according to claim 12, wherein a plurality of sheet-like composite materials are stacked to form the hollow cylinder.

14. The apparatus according to claim 11, wherein the humidifying device is one or more of a high pressure sprayer, an electrode humidifying device, an ultrasonic humidifier, and a wet film.

15. The composite material according to claim 2, wherein the mixture further comprises a suspending agent, optionally the suspending agent is a 2 wt % to 5 wt % sodium carboxymethyl cellulose aqueous solution, and further optionally the suspending agent is 5 wt % to 10 wt % of the total weight of the mixture.

16. The composite material according to claim 3, wherein the mixture further comprises a suspending agent, optionally the suspending agent is a 2 wt % to 5 wt % sodium carboxymethyl cellulose aqueous solution, and further optionally the suspending agent is 5 wt % to 10 wt % of the total weight of the mixture.

17. The composite material according to claim 2, further comprising a humectant sprayed on the interior and/or surface of the porous foam material to which the mixture has been sprayed, optionally the humectant is glycerol, optionally the amount of the humectant is 3 wt % to 5 wt % of the total weight of the mixture.

18. The composite material according to claim 3, further comprising a humectant sprayed on the interior and/or surface of the porous foam material to which the mixture has been sprayed, optionally the humectant is glycerol, optionally the amount of the humectant is 3 wt % to 5 wt % of the total weight of the mixture.

19. The method according to claim 9, wherein in the step of controlling the relative humidity, the relative humidity is controlled by a humidity sensor on the air inlet side and a humidity controller connected to the humidity sensor, as well as a humidifying device connected to the humidity controller.

20. The apparatus according to claim 12, wherein the humidifying device is one or more of a high pressure sprayer, an electrode humidifying device, an ultrasonic humidifier, and a wet film.