JPH0338247A - Deodorant - Google Patents

Abstract

PURPOSE:To compact a deodorant layer per one layer, decrease pressure loss, reduce maintenance and construction cost and improve deodorizing effect by providing a deodorant with through holes. CONSTITUTION:A deodorant with through holes formed therethrough is used. It may be shaped into any form of a circular, elliptic, triangular and square cylinder, the through hole may be of any shape and the number of such boles may be optionally selected. This deodorant is capable of removing a wide range of malodorous gas components such as sulfur compounds, e.g. hydrogen sulfide, mercaptan and methyl sulfide, nitrogen compounds, e.g. ammonia and amines, and fatty acids, aldehydes and ketones. Since such deodorant having the through holes can be used with the air blower low in static pressure and noise level, it is applicable in a new field such as a household deodorizing device and the device for business use in hospital, office, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deodorizer that is provided with through holes and that reduces pressure loss without increasing the filling amount.

[Conventional technology]

In service industries such as human waste treatment plants, sewage treatment plants, and garbage treatment plants, as well as chemical factories and hospitals, sulfur compounds such as hydrogen sulfide and mercaptan, ammonia, and nitrogen compounds such as amines, lower fatty acids, It is well known that foul-smelling gas containing a large amount of aldehydes and the like is generated.

Methods for deodorizing these foul-smelling gases include (1) cleaning and absorption using acids and alkaline solutions; (2) room-temperature oxidation using oxidizing agents such as potassium permanganate, hypochlorites, and ozone; and (3) direct oxidation. High-temperature oxidation method using combustion and catalytic combustion (4)
) Adsorption methods that use effective deodorizers to adsorb and remove malodorous components are often used, but each method has its advantages and disadvantages. 2 Regarding (1), the removal effect (deodorizing effect) is not sufficient.

Regarding (2), post-treatment is required to remove the oxidizing agent (Ch, 03, etc.) contained in the exhaust gas after treatment.

As for (3), fuel consumption increases because it is carried out at high temperatures.

Regarding (4), the deodorizing effect is much better than the former, but the adsorption capacity is limited, so it will be necessary to replace it at the end of its life. In addition, there is a pressure loss when the bad odor is vented through the deodorizing agent layer, and a blower with high static pressure is required.For two reasons, the running cost is relatively high.

The following shortcomings have been pointed out.

On the other hand, in the method (4) using an effective deodorizing agent, there have been many reports in recent years of activated carbon in which appropriate metals (Fe, Mn, Ni + Co, etc.) are supported and impregnated to increase the adsorption capacity. (JP-A-49-22390, JP-A-5
3-137071, JP 53-137089, JP 54-74271) (Problem to be solved by the invention) As mentioned above, many methods for increasing adsorption capacity have been reported, but deodorization Methods to reduce the pressure loss of the agent itself have been reported, but deodorizing methods using adsorption methods require a blower with high static pressure, so it has not been possible to reduce electricity costs during maintenance. In addition, improvements have been made to the deodorizing equipment, such as reducing the pressure loss by changing the shape of the packed tower in which the deodorizing agent is packed, or reducing the pressure loss by lowering the ventilation speed. However, there were drawbacks such as the cross-sectional area of the packed column becoming large and the amount of deodorizing agent packed in each column increasing.

[Means for Solving the Problems] The present inventors took into consideration the above-mentioned drawbacks of the conventional method and, as a result of intensive research, created a through-hole in the deodorizer that has been used conventionally, and made the central part of the deodorizer hollow. It has been found that a deodorizing agent can be obtained which can reduce pressure loss without increasing the amount of deodorizing agent charged in the first cycle.

FIG. 1 is a diagram showing the progress of adsorption in the adsorption tower, and generally adsorption progresses as shown in FIG. In the figure, A represents the adsorbed zone, the mouth represents the adsorbed zone (in progress of adsorption), C represents the unadsorbed zone, Z represents the full layer height, and Za represents the length of the adsorbed zone.

On the other hand, FIG. 2 is a sectional view of the deodorizer, and adsorption of the individual deodorizers in the adsorption zone portion of FIG. 1 proceeds as shown in FIG. In the figure, A indicates the state before adsorption, C indicates the state during adsorption, and 2 indicates the state of completion of adsorption.

In most cases, the rate-determining step in adsorption reactions is internal diffusion, and in the case of porous materials with internal pores, such as deodorizers, internal diffusion = pore diffusion.

The shape of the deodorizer of the present invention is a cylinder, an elliptical cylinder, a triangular cylinder,
They may have any shape, such as a rectangular prism, and the holes passing through them may have any shape, and the number of holes can be arbitrarily selected.

Now, referring to the case where the deodorizer and the through holes are cylindrical in shape, by making the cross section of the cylindrical deodorizer hollow, internal diffusion becomes faster, and as a result, the reaction rate of adsorption increases.

Figure 3 is a cross-sectional view of a deodorizer (one with through holes).
Adsorption of the hollow deodorizer provided with the through-holes proceeds as shown in FIG. 3. A indicates before adsorption, C indicates adsorption, and 2 indicates completion of adsorption.

As a result, the length of Za in the adsorption model shown in FIG. 1 decreases, and at the same time, if Z is constant, the adsorption capacity increases.

On the other hand, regarding pressure loss, as shown in FIG. 4, even if the apparent ventilation speed (superficial velocity) of the deodorizing tower remains the same, the actual speed at which the malodorous gas and the deodorizing agent come into contact changes. U in the diagram
is the apparent ventilation speed, ul or ut is i, respectively.
It shows the actual ventilation speed in a conventional deodorizing layer without through holes, and in the deodorizing layer of the present invention provided with ports and through holes.

In this case, un>uz, and the pressure loss Δp is proportional to u2. Therefore, the deodorizer provided with the through holes of the present invention has a lower pressure loss than the conventional deodorizer without the through holes.

The deodorizing agent of the present invention can be used as a deodorizing agent for removing a wide range of malodorous gas components such as hydrogen sulfide, mercaptans, sulfur compounds such as methyl sulfide, ammonia, nitrogen compounds such as alcohols, fatty acids, aldehydes, ketones, etc. .

Conventional deodorizers require a blower with high static pressure, so their main use has been limited to industrial use or deodorization for industrial use.

In the case of the deodorizer with through-holes of the present invention, not only can it be used for industrial purposes, but also a low-noise blower with low static pressure can be used.
A 100V power supply is now possible, and development in new fields such as household deodorizers and commercial deodorizers for hospitals, offices, etc. can be expected.

〔Example〕

The present invention will be explained below with reference to Examples and Comparative Examples.

Example 1 600 g of powdered activated carbon of 200 mesh or less and 120 g of cool pitch are thoroughly kneaded and extruded into a shape with through holes. After drying at 120'C for 1 hour, granular activated carbon is obtained according to a conventional method.

100 g of the obtained activated carbon with through holes is immersed in 200 g of a 5% sulfuric acid aqueous solution for 2 hours, and after drying, sulfuric acid impregnated carbon is obtained.

The main surface has an outer diameter of 6'''1φ, an inner diameter of 1'''8φ, and a length of 10''.
'L cylindrical deodorizer.

Comparative Example 1 Activated carbon kneaded in the same manner as in Example 1 was extruded into a cylindrical shape.
Shape. Thereafter, the same treatment as in Example 1 is performed to obtain cylindrical sulfuric acid-impregnated carbon.

The main surface has an outer diameter of 61φ and a length of 10”L.

Each of the sulfuric acid-impregnated carbons obtained in Example 1 and Comparative Example 1 was packed in a column to a height of Z = 35 cm, and the space speed L V
= 0.3''/-, an adsorption test was conducted at NH3fi degree of 100 ppm, and the breakthrough adsorption amount up to the outlet concentration of 1 ppm, the adsorption zone length Za, and the pressure drop were measured. The results are shown in Table 1.

Table 1, Example 2 600 g of activated carbon of 200 mesh or less and 300 g of natural zeolite of 200 mesh or less are thoroughly mixed. Next 5
% carboxymethylcellulose solution, thoroughly kneaded with the above mixture, extruded into a shape with through holes using the extruder used in Example 1, and then heated at 120'C for 1 hour. It was dried to obtain a deodorizer.

The size of the main surface was an outer diameter of 6'''1φ, an inner diameter of 2'''φ, and a length of 10''L.

Comparative Example 2 A deodorizing agent slurry kneaded in the same manner as in Example 2 was extruded into a cylindrical shape, and a deodorizing agent was obtained after drying in the same manner as in Example 2.

The size of the main surface was an outer diameter of 6'''-φ and a length of 10''L.

The deodorizers obtained in Example 2 and Comparative Example 2 were placed in the column at Z=3.
Fill to a height of 5 cm, LV=0.3'I8,)1. s
An adsorption test was carried out at an iJ degree of 11,000 ppm, and the breakthrough adsorption amount, Za, and pressure loss up to an outlet concentration of 1 ppm were measured, and the results are shown in Table 2.

Table 2 Example 3 600 g of activated carbon of 200 mesh or less and 120 g of tar pinch are thoroughly kneaded and extruded into a shape with through holes. Thereafter, after drying at 120°C for 1 hour, granular activated carbon is obtained according to a conventional method.

100g of the obtained activated carbon with through-holes was mixed with 2% N.
a0) Soaked in 200g of liquid for 2 hours, then dried,
Caustic soda impregnated charcoal was obtained.

The size of the main surface is outer diameter 4 +''+*φ, inner diameter 1'''1φ
, the length was 8"L.

Comparative Example 3 Activated carbon kneaded in the same manner as in Example 3 was extruded into a cylindrical shape, and then subjected to the same treatment as in Example 3 to obtain cylindrical caustic soda-impregnated carbon.

The size of this surface was an outer diameter of 4-φ and a length of 8″″L.

The caustic soda-impregnated carbon obtained in Example 3 and Comparative Example 3 was packed in a column to a height of Z = 35 cm, and LV = 0.3''/
,, CHjCOOH 1 degree 1100pp"i' adsorption test was conducted, and the breakthrough adsorption amount up to the outlet concentration of 1 ppm, Za
, the pressure drop was measured and the results are shown in Table 3.

Table 3 From the test results of Examples 1 to 3 and Comparative Examples 1 to 3, the deodorizer with through holes of the present invention was superior to the conventional cylindrical deodorizer in terms of adsorption amount, Za, and pressure loss. It is proving effective.

〔Effect of the invention〕

Usually, in a deodorizing method using an adsorption method, a combination of several types of deodorizing agents is used because the malodorous gas component is a composite gas of many types. (3 to 4 layers) When using the deodorizer of the present invention,
The deodorizer layer per layer becomes compact, and the total pressure loss of 3 to 4 layers is considerably reduced. As a result, compared to conventional deodorizing equipment filled with deodorizing agents, construction costs and maintenance costs are significantly reduced.

[Brief explanation of drawings]

Figure 1 is a diagram showing the progress of adsorption in the adsorption tower. In the figure, A is the adsorbed zone, the opening is the adsorbed zone (adsorption is in progress), C is the unadsorbed zone, Z is the height of the packed bed, and Za is the adsorbed zone. Represents the length of the obi. FIG. 2 is a cross-sectional view of each deodorizer in the adsorption zone portion of FIG. 1, showing the progress of adsorption. In the figure, A is a cross-sectional view of the deodorizer before adsorption, C is during adsorption, and No. 42 is a sectional view of the deodorizer after adsorption is completed. FIG. 3 is a cross-sectional view of each deodorizer (with through holes) in the adsorption zone, showing the progress of adsorption. In the figure, A is a cross-sectional view of the deodorizer before adsorption, C is during adsorption, and D is the state after adsorption is completed. Figure 4 is a diagram showing the ventilation speed in the deodorizer layer, where A is the conventional deodorizer layer, the opening is the diagram showing the ventilation speed in the deodorizer layer with through holes, and U in the diagram is the apparent The above ventilation speed, ul or u2, respectively represents the actual ventilation speed at the opening of the conventional deodorizing layer without 48 through holes or the deodorizing layer of the present invention with 0 through holes.

Claims (1)

[Claims] A deodorizer characterized by having through holes.