JP3168387B2 - Deodorizing material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing material for removing odors from solvents such as toluene and xylene and a method for producing the same. The deodorizing material of the present invention can be used, for example, as a deodorizing material for a painting factory and a printing factory.

[0002]

2. Description of the Related Art An adsorption method using activated carbon, a direct combustion method, and a catalytic combustion method are used for the odor of a solvent such as toluene and xylene. However, the adsorption method using activated carbon has a safety problem that ignition and fire easily occur due to the heat of adsorption.The direct combustion method requires high fuel costs and requires a high combustion temperature to completely combust odorous components. There is a problem such as the generation of oxides. In the catalytic combustion method, the catalyst is poisoned by pigments such as silicic acid contained in the paint, and the deodorizing performance deteriorates in a short period of time. was there.

[0003]

Activated carbon is a flammable substance and has a risk of fire, but has an excellent ability to adsorb solvents such as toluene and xylene.

Therefore, measures such as coating granular activated carbon with a non-combustible substance having good air permeability can be considered. A method of kneading powdered activated carbon with a nonflammable substance and molding the same is also conceivable.

However, it is generally extremely difficult to use a non-combustible substance which has good moldability, has sufficient strength to maintain its shape, and does not impair the adsorption performance of activated carbon.

With respect to the moldability, for example, in the case of extrusion molding, fluidity is required, but if a viscous mineral such as kaolin having good fluidity is selected as a mixed material, molding can be performed, but even if it is dried, Sufficient strength cannot be obtained.

In such a case, if the sintering treatment is not performed after molding, the strength that can withstand transportation and use cannot be maintained or the air permeability is poor, so that the adsorption performance of activated carbon is significantly impaired. Another problem is that activated carbon is oxidized and consumed during the sintering process. It also requires sintering costs.

Regarding the shape retention strength, for example, an adhesive for maintaining the strength after molding has a high affinity for activated carbon and covers the fine pores which are an essential feature of the activated carbon adsorption performance, thereby impairing the adsorption performance.

[0009]

[Means for Solving the Problems] Chain magnesium silicate is selected as a nonflammable and air-permeable viscous mineral, halloysite is selected as a material for improving fluidity during molding, and molding is performed when mixed with powdered activated carbon. The present invention was developed by conducting research on a proper compounding method without mixing property, strength, deodorizing performance and danger of fire and a method of preparing a kneading liquid.

[0010] That is, a non-flammable composition is ensured by blending a porous, highly breathable chain-like magnesium silicate as a main component, and a small amount of flowable halloysite is blended to enhance moldability, and at the same time, a mixed aqueous solution of phosphoric acid and hydrazine is used. It was found that the clay mineral was hardened by kneading and strength could be obtained, and the performance of powdered activated carbon was successfully brought out.

In the evaluation of the adsorption capacities of toluene, xylene, etc., the adsorbing capacities are equal to or more than the amount of activated carbon. The chain magnesium silicate also has the adsorbing capacity of toluene, xylene, etc. due to the effect of phosphoric acid and hydrazine. Suggest that.

[0012]

Next, an embodiment of the present invention will be described.

Sepiolite powder (Maruzen Co., Ltd. in 1986)
According to the "Ceramics Dictionary" published by the company, fibrous forms
A type of clay mineral that has a structure similar to a double-chain structure.
Composition is Mg_FourSi₆O_Fifteen(OH)_Two(OH_Two) ・ 4H_TwoO.
Produced in a vein form in dolomite and also produced by alteration of serpentine
Cheating. ), Halloysite powder ("Ceramics"
According to the ceremony, a kind of kaolin mineral, between 1: 1 layers
One molecular layer of H_TwoO is sandwiched between layers
And the composition is Al_TwoSi_TwoO_Five(O H)_Four・ 2H_TwoRepresented by O
You. ), Activated carbon powder mixed at the weight ratio shown in Table 1.
And hydrazine, aluminum sulfate and phosphoric acid as shown in Table 2.
Around 100% by weight of the aqueous solution prepared in
(Appropriate moisture for extrusion molding to be described later is 95% to 110%
If it is less than 90% or 115% or more, molding is impossible.
Was. ), Kneaded, and molded by an extrusion molding machine.

The die of the extrusion molding machine has a circular hole having a diameter of 2 mmφ, and the molded product has a columnar shape. Although the molded article can be lengthened like a noodle, it is cut to 50 mm in this example. The extruded product was heated to 100 ° C. with a dryer and dried to obtain a final product.

Extrusion molding was impossible among various compounds, and they were judged as x in the evaluation of fluidity. Those that can be molded were judged as ○. The evaluation of deodorizing performance, strength, nonflammability, etc. was omitted for combinations of poor moldability.

The molded products were compared with the deodorizing performance of toluene and xylene using those products and commercially available granular activated carbon. The evaluation device was constructed as shown in Fig. 1 and a circulating fan was installed in an acrylic box with an internal volume of 1 m ³ , and each deodorizing material was
0 g was put in an 80 mm square bottom box made of a net and set at the entrance of the fan, and the removal performance of toluene and xylene was measured with a detector tube.

The initial concentration was 500 ppm and the circulating air flow was 400 l / min, and the adsorption capacity was compared by examining how much the concentration was reduced after 30 minutes. The commercial granular activated carbon was reduced to 30 ppm for both toluene and xylene, and did not decrease at all in the blank test without the deodorizing material, and the initial concentration was maintained after 30 minutes.

Regarding the deodorizing performance, considering the competitiveness with activated carbon, if the concentration after 30 minutes is 60 ppm or less, 、, 6
If it is 1 ppm or more and 120 ppm or less, Δ, 121p
At pm or more, it was evaluated as x.

As for the strength of the molded article,
g into a pipe of 100 mmφ * 1000 mmL, so that the positional relationship between the upper and lower lids of the pipe is alternately switched.
Evaluation was made by examining the degree of powdering by rotating 0 times.

The generation of the powder was sieved with a 1 mm sieve, and the weight was measured. Less than 1% of powder generation was evaluated as ○, 1% or more and less than 3%, Δ as 3% or more.

Regarding the ignitability of the product, 10 g of the sample was heated with a gas burner for 1 minute.
When it did not ignite, it was judged as ○.

[0022]

[Table 1]

[0023]

[Table 2]

The evaluation results are summarized in Table 3. Moldability,
Deodorizing performance, strength, and nonflammability are all satisfied.
A mixed powder containing 55 to 80% by weight of chain magnesium silicate, 10 to 15% by weight of halloysite, and 10 to 30% by weight of powdered activated carbon is mixed with 0.5 to 1.0 mol / l of phosphoric acid and 0.5 to 1.0 mol / l of hydrazine. Aqueous solution containing 95 to 110
It was possible to obtain a kneaded, molded product with the addition of about 10% by weight.

[0025]

[Table 3]

[0026]

According to the present invention, it is possible to produce a deodorizing material which has high removal efficiency of toluene and xylene, is nonflammable, and can secure moldability and strength at a practical level.

[Brief description of the drawings]

FIG. 1 is a view showing an apparatus for evaluating a deodorant according to the present invention.

[Description of Signs] 1 Closed container 2 Circulation fan 3 Deodorizing material 4 Gas inlet 5 Gas sampling port 6 Gas circulation direction

Claims (2)

(57) [Claims] 1. A chain magnesium silicate of 55 to 70% by weight, halloysite of 10 to 15% by weight, powdered activated carbon of 10 to 10% by weight.
0.5 to 1.0 mol of phosphoric acid is added to the mixed powder containing 30% by weight.
A method for producing a deodorizing material, characterized in that an aqueous solution containing 1 / l and 0.5 to 1.0 mol / l of hydrazine is added to a solid content in an amount of 95 to 110% by weight, kneaded and molded. 2. A deodorizing material for removing odor of a solvent such as toluene or xylene produced in claim 1.