KR900003443B1 - A deodorant for air and preparation method thereof - Google Patents

Abstract

A method for prepg. deodorant comprises (a) heating active carbon (particle size: 4-12 mesh, sp. surface area of porosity: 800-1400 m2/ g) in distd. water of 1-3 hr and drying, (b) impregnating the carbon in soln. (of 10-20% NaOH (or KOH) and 1-5% ferrous sulfate) with occasionally stirring for carrying 5-20% NaOH (or KOH) and 1-5% ferrous sulfate, (c) allowing to stand for 5 day, and (d) filtering off liquor and vacuum drying.

Description

Deodorant for air purification and manufacturing method

1 is a schematic diagram of a manufacturing method of the present invention deodorant

2 is a graph showing a conventional adsorption of desulfurizer and sulfur dioxide (SO ₂ ) of the deodorant of the present invention as a function of equilibrium adsorption as a function of sulfur dioxide pressure.

3 is a graph showing a change in adsorption amount according to the passing time of sulfur dioxide (SO ₂ ) between the conventional activated carbon deodorant and the deodorant of the present invention.

The present invention provides a new activated carbon deodorant which has excellent adsorption capacity against harmful acid gases in the air, such as sulfur dioxide (SO ₂ ) formed by impregnating a specific compound on activated carbon having a granular structure. It relates to a manufacturing method. Generally, activated carbon adsorbents are widely used because they adsorb various odorous substances in the air at low concentrations relatively well. In other words, activated carbon has a relatively high molecular weight and is excellent in holding power with respect to a component that is not hydrophilic, and effectively removes a low concentration complex odor component.

However, it is known that the odorous components such as sulfurous acid gas (SO ₂ ), which is a harmful acid gas emitted from coal, petroleum, and the like, and are widely emitted from sulfuric acid plants and smelting plants, are not known to have an effect without a specific operation.

The present invention aims to provide an air purifying deodorant and a method for producing the same, which have excellent performance in mainly removing adsorption of acidic gases in the air, in particular, odors containing trace amounts of acidic substances such as sulfurous acid gas in a closed space. .

According to the present invention, there is provided a new air purifying deodorant impregnated with alkali metal hydroxide (sodium hydroxide or potassium hydroxide) and ferrous sulfate on granular activated carbon.

This deodorant has excellent adsorption capacity against harmful acid gases in the air such as sulfurous acid gas.

In the deodorizing agent of the present invention, the activated carbon preferably has a granular structure having a particle size of 4-12 mesh and a pore specific surface area of 800-1400 m 2 / g.

As activated carbon, various ones of the prior art can be used. Particularly preferred is to activate ordinary coconut shells by dry distillation.

The compound impregnated and supported on activated carbon is sodium hydroxide (NaOH) + ferrous sulfate (FeSO ₄ ) or potassium hydroxide (KOH) + ferrous sulfate (FeSO ₄ ), more preferably sodium hydroxide + ferrous sulfate.

About 5-20% of alkali metal hydroxide and about 1-5% of ferrous sulfate are applied based on the weight of activated carbon.

In the deodorant of the present invention, the total amount of the compound supported on the activated carbon is 5-25%, preferably 10-20%. If the supported amount is too small, the resultant deodorant may not have a predetermined performance, and if the supported amount is excessive, the provision of activated carbon may be prevented, which may have a rather adverse effect. In addition, the particle size considers the pressure loss of the deodorizing filter. When 12 mesh or more, the activated carbon particles are densely packed to increase the pressure loss. 12 meshes were selected.

Figure 1 schematically shows a method of manufacturing the present invention deodorant. As shown in the figure, the production method of the present invention is roughly divided into three steps: pretreatment of activated carbon, compound impregnation, and vacuum drying.

Pretreatment of activated carbon is obtained by burning granular activated carbon having a particle size of 4-12 mesh and a pore specific surface area of 800-1400㎡ / g by distilled water for about 1-3 hours after burning by drying of coconut shell. Do it. Impregnation and vacuum drying of the compound dissolve the pretreated activated carbon in a mixed solution of alkali metal hydroxide and ferrous sulfate at a predetermined concentration, for example 200 g of sodium hydroxide or potassium hydroxide and a small amount of ferrous sulfate in 500 g of activated carbon. The solution was immersed and left for a predetermined time (for example, 5 days) with occasional stirring, and then the immersion liquid was separated by filtration and the residual activated carbon was vacuum dried.

According to the method described above, a deodorant in which 5-20% of alkali metal hydroxide and 1-5% of sulfuric acid is impregnated on activated carbon is prepared. The loading amount of the alkali metal hydroxide and ferrous sulfate can be adjusted by adjusting the respective concentrations in the mixed solution and the addition period of the activated carbon.

The present invention will be described in more detail with reference to the following examples.

Example 1

100 g of granular activated carbon with 4-12 mesh particle size and 800-1400 m2 / g of pore specific surface, respectively, were mixed with 20% sodium hydroxide + 3% ferrous sulfate and 20% potassium hydroxide + 3% Two kinds of deodorants (Samples No. 2 and 3) were prepared by immersion in a mixed solution of ferrous sulfate and allowed to stand for 5 days, and then the activated carbon was separated from the filtrate and dried in vacuo.

The physical properties of the known activated carbon (Sample No. 1) for these and comparative experiments are described in the following Table 1.

[Table 1] Physical Properties of Samples

The adsorption amount of sulfur dioxide was measured by contacting each sample with pure sulfurous acid gas at 0 ° C while varying the sulfur dioxide (SO ₂ ) pressure by using a quartz spring weight adsorption apparatus. The results are shown in FIG. . As can be seen from FIG. 2, the deodorizing agents (Nos. 2 and 3) of the present invention have an excellent ability to adsorb sulfur dioxide compared to the known general activated carbon. In addition, it can be seen that the deodorant (No. 2) in which sodium hydroxide and ferrous sulfate were supported on activated carbon exhibited a superior effect than the deodorant in which potassium hydroxide and ferrous sulfate were supported.

Example 2

1 g of each sample of Table 1 was separately charged into a flow-through adsorption apparatus, and nitrogen gas containing 100 ppm of sulfurous acid gas was passed through at a flow rate of 3 liters for 1 minute to measure the amount of sulfite gas adsorption. Shown in 3 degrees. As can be seen from the results, general activated carbon (No. 1) has a low adsorption capacity of sulfurous acid gas, but the deodorants (No. 2 and 3) of the present invention showed a very large adsorptive power.

In particular, the deodorant (No. 2) to which sodium hydroxide was attached showed a greater adsorption force than the deodorant (No. 3) to which potassium hydroxide was impregnated.

Deodorant of the present invention as described above exhibits excellent adsorption capacity for the sulfur oxides emitted from sulfur dioxide (SO ₂ ) generated from various combustors, sulfuric acid plants, refining plants, etc. It can be widely applied to commercial air cleaner deodorization filter or air conditioning filter.

Claims (2)

Granular activated carbon having a particle size of 4-12 mesh and a pore specific surface area of 800-1400 m 2 / g is based on the weight of activated carbon and known alkali metal hydroxides (sodium hydroxide or potassium hydroxide) and ferrous sulfate are 5-20% and 1-, respectively. Activated carbon deodorant for air purification with 5% impregnation. Granular activated carbon having a particle size of 4-12 mesh and a pore specific surface area of 800-1400 m 2 / g was heated in distilled water for 1-3 hours and dried to give alkali metal hydroxide (sodium hydroxide or potassium hydroxide) at a concentration of 10-20%. And stirring and immersing in a mixed solution of ferrous sulfate at a concentration of 1-5% so that 5-20% of alkali metal hydroxide and 1-5% of ferrous sulfate are impregnated and supported on the activated carbon based on the weight of activated carbon, followed by vacuum drying it. Method for producing activated carbon deodorant for air purification, characterized in that.

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