KR900001367B1 - A deodorant for the basic gas - Google Patents

Abstract

A deodorant comprises (A) active carbon (AC), and (B) 5-25wt.% (to the AC) of mixt. of alkali metal halide and acid: such (a) as potassium bromide + phosphoric acid + citric acid or (b) potassium iodidet phosphoric acid. The deodorant is useful for removing offensive odor i.e. ammonia and is applied to air cleaner or air conditioner.

Description

Deodorizer for Air Purification

1 is a graph showing the equilibrium adsorption amount as a function of ammonia gas pressure in the conventional activated carbon deodorant and the ammonia gas (NH ₃ ) of the deodorant of the present invention.

2 is a graph showing a change in adsorption amount according to the passage time of ammonia gas (NH ₃ ) of the conventional activated carbon deodorant and the deodorant of the present invention.

The present invention relates to a deodorizing agent for air purification, and more particularly, to a new deodorizing agent having an excellent effect on the removal of odors containing basic gases such as ammonia (NH ₃ ), etc., in which a specific mixture is added to activated carbon.

Activated carbon has been widely used as a typical malodor adsorbent since it exhibits a universal adsorption and removal effect for a wide range of odors.

However, activated carbon is effective for adsorption of nonpolar hydrocarbons such as benzene and toluene, but it is not necessarily sufficient for odorous gas containing ammonia (NH ₃ ) odor which shows complex odor. This is because the surface is non-polar and the adsorption is due to physical adsorption by Van Der Waals forces including maternal condensation.

An object of the present invention is to provide a deodorant for purifying air having excellent performance in adsorption and removal of odors containing basic gases such as ammonia (NH ₃ ), which are frequently generated in restaurants, entertainment establishments and medical institutions.

According to the present invention there is provided a new air purifying deodorant in which activated carbon is impregnated with a mixture of an acid and an alkali metal halide.

This deodorant has excellent adsorption capacity against harmful basic gases in the air such as ammonia.

In the deodorant of the present invention, almost any activated carbon having an activated carbon surface, such as those obtained by carbonizing and activating coconut shell, or using coal or petroleum pitch as raw materials, can be used.

The shape of the activated carbon can be in the form of crushed non-uniform granular, cylindrical, spherical or other shape, and the fibrous activated carbon is particularly suitable for use because of its large contact surface.

In the deodorant of the present invention, the compound impregnated on activated carbon is applied at a level of about 5-25% based on the weight of activated carbon as a mixture of alkali metal halide and acid. Preferred mixtures of alkali metal allides and acids are mixtures of (a) potassium bromide (KBr) with phosphoric acid (H ₃ PO ₄ ) and citric acid (C ₆ H ₈ O ₇ ) or (b) potassium iodide (KI) + phosphoric acid ( H ₃ PO ₄ ).

On the other hand, in the mixture (a), the mixing ratio of potassium bromide, phosphoric acid and citric acid is 10: 30: 1 to 30: 10: 5 based on the weight, and in the mixture (b), the mixing ratio of potassium iodide and phosphoric acid is based on weight. And from 10:30 to 30:10. The supporting amount of the mixture is most suitably 10: 20% of the weight of the activated carbon. If the amount of loading is excessive, it prevents the pore of activated carbon, so it is not effective

For example, 500 g of activated carbon was immersed in a solution of 200 g of potassium bromide and 100 g of phosphoric acid and 10 g of citric acid in 2 liters of water, or a solution of 200 g of potassium iodide and 100 g of phosphoric acid in 2 liters of water and occasionally stirred. After leaving for 5 days, the immersion liquid was separated by filtration and the remaining activated carbon was dried at 100 ° C for 2 days. The loading amount of the mixture can be calculated by measuring the difference in the weight of activated carbon before and after dipping.

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

Example 1

100 g of granular activated carbon of 6-24 mesh granules activated by the coking of the coconut shell was immersed in a solution composed by mixing 1000 10 of 10% aqueous potassium bromide solution and 1000 혼합 of a mixed aqueous solution of 20% phosphoric acid / 10% citric acid. After standing for 5 days, the filtrate was separated from the filtrate and the activated carbon, and the separated activated carbon was completely dried in a dryer at 100 ° C to prepare a deodorant (sample No. 2). In addition, a different deodorant (Sample No. 3) was prepared in the same manner as described above, except that a mixed solution of 1000% 10% potassium iodide and 1000% 20% phosphoric acid was used instead of a mixed solution of potassium bromide / phosphate / citric acid. Prepared. The physical properties of the known activated carbon (Sample No. 1) for the two deodorants and comparative tests are shown in Table 1 below.

TABLE 1

Sample property

The adsorption amount of ammonia gas was measured by contacting each sample with pure ammonia gas at 20 ° C. while varying the ammonia gas (NH ₃ ) pressure by using a quartz spring weight adsorption apparatus. The results are shown in FIG. . As can be seen from FIG. 1, the deodorants (Nos. 2 and 3) of the present invention have an excellent ability to adsorb ammonia gas as compared with known general activated carbon.

The deodorant (No. 2) on which potassium bromide was deposited shows a better effect than the deodorant (No. 3) on which potassium iodide was deposited.

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 ammonia gas was passed at a flow rate of 3 liters for 1 minute. As can be seen from the results, general activated carbon (No. 1) has a low adsorption capacity of ammonia, but the deodorants (No. 2 and 3) of the present invention showed a considerably large adsorption power. In particular, the deodorant (No. 2) on which potassium bromide was deposited showed a greater adsorption capacity than the deodorant (No. 3) on which potassium iodide was deposited.

Example 3

1000ppm of ammonia gas was put in an airtight container, and 10g of sample activated carbon of Table 1 was charged separately, and the degree of odor was measured by time by the six-step sensory test method.

TABLE 2

Degree of odor

Note) Six-stage sensory test method: Notice of the Ministry of Health and Welfare 공 Pollution Process Test Method of Odor 이면 Odor grade is 0, odorless if 1, weak odor if 2, normal odor if 3, strong odor , 4 means 취 extreme odor, and 5 means 취 hard odor.

The results of the sensory test showed almost the same results as in Examples 1 and 2, and it was found that the two samples showed superior performance compared to the three samples. Deodorant of the present invention as described above has the advantage of removing the bad smell of basic substances such as ammonia (NH ₃ ), and because the odor molecules once adsorbed chemically bonded to the impregnated chemicals do not desorption air cleaner or air conditioner When used in air conditioning equipment such as (Air Conditioner), excellent deodorizing effect is obtained.

Claims (4)

A deodorant for purifying air for removing odors of basic gases including ammonia gas formed by impregnating an activated carbon material with a mixture of an acid of 5-25% of an alkali metal halide based on the weight of an activated carbon material. The deodorant for air purification according to claim 1, wherein the activated carbon material is granular or fibrous, such as crushed or spherical. The deodorizing agent for air purification according to claim 1, wherein the mixture of the alkali metal halide and the acid consists of potassium bromide, phosphoric acid and citric acid. The deodorant for air purification according to claim 1, wherein the mixture of the alkali metal halide and the acid is composed of potassium iodide and phosphoric acid.

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