JP2013188302A - Method and device for cleaning indoor air by using sulfamic acid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the removal of odor caused by smog and particulates and the prevention of indoor browning and browning of furniture by inexpensively and simply removing the smog of an odor substance and its particulates floating indoors and cleaning indoor air.SOLUTION: A method for cleaning indoor air by using sulfamic acid is the method for removing basic smog or particulates floating in the air by making the air containing basic smog or particulates be brought into contact with a base that is constituted of paper, fabric, and non-woven fabric, etc. and impregnated with a sulfamic acid aqueous solution. A moisture absorption agent is included, that is necessary to prevent a sulfamic acid aqueous solution from being dried. In this case, a surfactant, etc., may be included in order to uniformly impregnate the base with a sulfamic acid aqueous solution, and also the surface area of the base may be enlarged by making the base have a bellows or honeycomb shape.

Description

  The present invention relates to a method and apparatus for purifying indoor air and preventing browning of indoor surfaces and furniture by removing odorous fumes and fine particles thereof drifting indoors at low cost.

  Conventionally, adsorbents such as activated carbon and zeolite, ion exchange paper, or ion exchange resin have been used to remove smoke or fine particles composed of odorous substances generated during smoking, grilled fish, and grilled meat.

  Activated charcoal and zeolite must be used as a powder because of their characteristics. Therefore, a strong force is required to pass the fumes or fine particles together with air in the powder layer, and the fumes or fine particles are aired into the powder layer without using a strong force. In order to pass along with it, the powder layer must be made thin.

  However, if the powder layer of activated carbon or zeolite is thinned, the adsorption capacity is reduced, and there is a disadvantage that the activated carbon and zeolite must be replaced frequently.

  In addition, ion exchange paper and ion exchange resin are expensive, and are not suitable for capturing weakly basic substances such as smoke or fine particles of odorous substances generated during smoking, grilled fish, and grilled meat due to insufficient acid strength. There were drawbacks.

JP-A-10-179708 Japanese Patent Laid-Open No. 54-60286 JP 2002-143285 A JP 2002-146386 A

  The problem to be solved by the present invention is the development of a method and apparatus for efficiently and efficiently removing fumes or fine particles of odorous substances floating in the room.

  The main feature of the present invention is that air containing fumes or fine particles is brought into contact with an adsorbent impregnated with an aqueous solution of sulfamic acid in order to remove fumes or fine particles of odorous substances floating in the room.

  That is, the present invention relates to an odor substance floating in the air by bringing the odor substance fumes or air containing fine particles into contact with a base (carrier) such as paper, cloth or nonwoven fabric impregnated with an aqueous solution of sulfamic acid. It captures and removes fumes or fine particles.

  Here, the concentration of sulfamic acid in the aqueous solution of sulfamic acid is preferably 8 to 15%. Moreover, it is preferable to contain a hygroscopic agent in the aqueous solution of sulfamic acid in order to prevent drying. Examples of the hygroscopic agent include glycerin, ethylene glycol, propylene glycol, and butanediol. Further, it is preferable to contain a wetting agent such as PEO oleyl ether in order to uniformly impregnate the base material with the aqueous sulfamic acid solution.

  Further, since it is desirable to remove indoor odorous substances as soon as they occur, it is advantageous for the apparatus of the present invention to increase the adsorption area of the base as much as possible and to increase the adsorption capacity. However, since the apparatus is desired to be as small as possible, it is preferable that the adsorption paper or the like is formed in a bellows shape or a honeycomb shape so as to widen the adsorption area of the base.

  Further, it is preferable to install a small fan to force the air in the apparatus to flow forcibly so that a large amount of air containing an odorous substance can quickly come into contact with an adsorbent containing an aqueous sulfamic acid solution.

  According to the present invention, since smoke or fine particles made of odorous substances drifting in the room are adsorbed by the base of the apparatus, the odors and tar substances are removed, the space is cleaned, brown color of indoor surfaces and furniture, etc. There is an advantage that it is prevented.

FIG. 1 is a perspective view of an embodiment of the apparatus of the present invention. FIG. 2 is a cross-sectional view showing an example of the AA cross section of FIG. FIG. 3 is a cross-sectional view showing another example of the AA cross section of FIG.

  The purpose of removing odorous fumes or fine particles floating indoors at low cost and effectively was achieved without using expensive materials.

(Test 1)
A test was conducted using the trapping materials shown in Sample Nos. 1 to 8 in Table 1 below as to what is effective in capturing the odors or fine particles of odorous substances floating in the room.

Here, as the base material (carrier) to be impregnated with the capturing material, a polyester cloth having a mesh size of 150 g / m ² , a thickness of 0.32 mm, and a size of 10 cm × 20 cm is used. The amount was 3 g per sheet.

  Moreover, the width of the tested room is 2.7 m in length, 5.4 m in width, and 2.5 m in height. The sample pieces were suspended at a distance of 30 cm at a height of 2 m. Tobacco was used as a source of odorous fumes or fine particles. Tobacco smoked 6-7 cigarettes per day. The test days were 20 days (manned days only).

The test result was examined by discoloration of each test piece. The results were as shown in sample numbers 1 to 8 below.
Sample number Test result 1 No change 2 No change 3 No change 4 No change 5 No change 6 No change 7 Almost no change 8 Full brown

  The test results showed that sulfamic acid was the most effective as shown in Sample No. 8, and that odorous fumes or fine particles floating in the room were basic substances.

(Test 2)
In Test 1, since it was found that the acidic liquid was effective, in Test 2, an adsorption test was performed on the acidic substances of sample numbers A to J in Table 2 below. The test conditions were the same as in Test 1.

The test result was examined by discoloration of each test piece. The results were as shown in sample numbers A to J below.
Sample number Test result A Almost no change B Almost no change C Whole brown D Fully pale <brown (2nd day dry state)
E Almost unchanged F Fully light brown G Almost unchanged H Almost unchanged I Entirely brown J Almost unchanged

(Test 3)
In Test 3, an adsorption test was conducted by changing the test place to Yakitori-ya. The size of the yakitori restaurant is 2.4 meters long, 4 meters wide, and 2.5 meters high. The same substrate and test solution as used in Test 2 were used. The size of the test piece was 5 cm × 8 cm, the impregnation amount was 1 g per test piece, and the test days were 7 days. The test specimen was installed at a depth of 2m behind the passenger seat at a distance of 5cm, with a shelf attached to the lower part so that it could not be seen by visitors. Yakitori-ya had 92 visitors for 7 days.

  According to the results of Test 3, sulfamic acid / sulfuric acid is the best, followed by pyrophosphoric acid. However, depending on conditions such as humidity and temperature, sulfuric acid can cause carbonization of paper and cotton, and can also deteriorate the nonwoven fabric (synthetic resin). Furthermore, since sulfuric acid is corrosive to the skin, it is not suitable for use. Pyrophosphoric acid is not suitable for use because it has a weak effect and is easily hydrolyzed.

In contrast, sulfamic acid is only about 25% soluble in water at room temperature, and its powder and aqueous solution are less corrosive to the skin and safe, and oral toxicity in rats is also LD ₅₀ > 2000 mg / kg (OECD TG40 / iGLP) and high safety.

  In addition, since sulfamic acid has no effect unless it is made into an aqueous solution, it becomes an aqueous solution so that it can be uniformly coated and impregnated on paper, cloth, nonwoven fabric, etc. if necessary, in order to prevent drying. In addition, it is preferable that a solution obtained by impregnating paper, cloth, nonwoven fabric or the like with a surfactant-added liquid is brought into contact with floating fumes or fine particles.

(Invention device)
Next, an apparatus for carrying out the above method will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of the apparatus of the present invention, and FIG. 2 is a cross-sectional view showing an example of the cross section of FIG. 1. The apparatus of the present invention is filled with a cylindrical body 10 The substrate 12 includes a fan 14 attached to the upper part of the cylindrical body 10, and a small motor 16 that drives the fan 14.

  An air inlet 18 is provided at the lower part of the cylindrical body 10, and an air outlet 20 is provided at the upper part of the cylindrical body 10. The fan 14 is provided in the vicinity of the air outlet 20. As the substrate 12, paper, cloth, nonwoven fabric or the like formed in a bellows shape as shown in FIG. 2 or a honeycomb shape as shown in FIG. 3 can be used. The substrate 12 is impregnated with about 10% aqueous sulfamic acid solution, about 10% glycerin (humectant) and about 1% PEO oleyl ether (wetting agent).

  This device is used as follows. That is, when the small motor 16 is turned on and the fan 14 is rotated, the inside of the cylindrical body 10 is depressurized, and odorous substances or fine particles drifting in the room are sucked into the cylindrical body 10 from the air intake port 18 together with air. Is done. Smoke or fine particles of the odorous substance sucked into the cylindrical body 10 rises together with the air through the gaps in the base material 12 and is captured by the sulfamic acid aqueous solution impregnated in the base material 12. Air purified by removing fumes or fine particles of odorous substances is discharged from the air outlet 20 into the room.

DESCRIPTION OF SYMBOLS 10 Cylindrical body 12 Base 14 Fan 16 Small motor 18 Air inlet 20 Air outlet

Claims (3)

  A method of removing basic fumes or fine particles floating in the air by bringing air containing basic fumes or fine particles into contact with a base made of paper, cloth, non-woven fabric or the like impregnated with an aqueous solution of sulfamic acid. A method for removing fumes or fine particles of a basic substance characterized by containing a hygroscopic agent necessary for preventing drying of an aqueous sulfamic acid solution.   A method for removing a basic substance, wherein the base is impregnated with an aqueous sulfamic acid solution to increase the surface area of the base, and the base is formed into a bellows or a honeycomb.   A device in which a fan is installed in order to quickly bring a large amount of air containing a basic substance into contact with a base containing an aqueous sulfamic acid solution.

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