JP3151538B2 - Method and apparatus for producing deodorizing granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a deodorizing granule obtained by further processing a deodorizing fine powder for removing an odor of an odorous gas such as ammonia and hydrogen sulfide into a form which can be more easily used, and an apparatus for producing the same. .

[0002]

BACKGROUND OF THE INVENTION In recent years, deodorants containing zinc oxide and titanium dioxide as deodorizing components (see JP-A-63-54935) and deodorants containing zinc oxide, aluminum oxide and silicon oxide as deodorizing components (see JP-A-63-54935). 63-246167
Has been used in various fields because of its strong deodorizing performance. The deodorized fine powder typified by such a deodorant is a fine particle on the order of microns or submicrons, and is scattered when used as it is.

[0003] Therefore, when this is used, P
It has been used by supporting it on paper, fiber, foam, etc. using a binder such as VA. However, when used in such a method, granulation is difficult due to the viscosity of the binder and the like.
There is a problem that the deodorizing function is reduced due to the poor gas permeability of the VA membrane.

[0004] Further, after the deodorized fine powder is carried on a sheet, it is exposed to an atmosphere containing active species to roughen the surface, or the deodorized fine powder is dispersed to form a high-viscosity aqueous solution. Although a method of granulating from things has also been proposed, the former method cannot contain many deodorized fine powders in the process of forming into a sheet, and the latter method is because water is a dispersion medium. The binder function was not obtained, and the granulated product was shattered when crushed with a finger.

Therefore, the inventor of the present invention inspired the so-called artificial production method and dropped a mixture of the deodorized fine powder in a water-soluble alginate aqueous solution into a certain metal salt aqueous solution, an acid or alcohol. In addition to developing a technique of gelling the surface of the droplets by drying and granulating the droplets by drying (see JP-A-2-298346), a nozzle suitable for use in such granulation is a tube. A device having a drip portion formed by extending a linear body from the body end has been developed (see JP-A-3-202138).

However, even if such a nozzle is used, since a kind of natural phenomenon called dripping is used, the production amount per unit time is naturally limited, and the efficiency of the production is high enough to meet industrial production. Good manufacturing cannot be performed. Further, although the size of the particle size can be adjusted to some extent, the nozzle has a narrow range, and it is desired that the nozzle can be adjusted more widely and freely to meet various needs. Further, the nozzle may be clogged, and repairing the nozzle takes time and effort. In this way, we had some issues.

[0007]

[Technical matters attempted to be developed] The present invention has been made in view of such a background, and in producing a deodorizing granule, a deodorizing granule which can be produced more efficiently and whose particle diameter can be adjusted over a wide range. An attempt was made to develop a manufacturing method and an apparatus therefor.

[0008]

Configuration of the Invention

Means for Achieving the Object In a first aspect of the present invention, a method for producing a deodorant granule comprises a partition wall between a dispersion particle holding chamber and a dispersion stock solution supply chamber, and a fine deodorization fine dispersion chamber. A stock dispersion obtained by dispersing the powder in a water-soluble alginate aqueous solution is supplied in a pressurized state from the dispersion particle holding chamber, and this dispersion stock solution is extruded in a droplet state to the dispersion particle holding chamber side through the porous partition wall. The droplets are reacted with a dispersed particle holding liquid to gel at least the surface of the droplets to form an intermediate product, which is dried and granulated.

Further, in the method for producing a deodorizing granule according to the second invention of the present application, in addition to the above-mentioned requirements, the pressurizing of the dispersion stock solution supply chamber is performed by a method of periodically repeating pressurizing and non-pressurizing. It is characterized by the following.

Further, in the method for producing a deodorizing granule according to the third invention of the present application, the dispersion particle holding chamber and the dispersion liquid supply chamber are partitioned by a porous partition, and the dispersion particle holding liquid is filled in the dispersion particle holding chamber. The dispersion liquid is supplied in a certain direction, and the dispersion liquid supply chamber is supplied with a dispersion liquid in which deodorized fine powder is dispersed in a water-soluble alginate aqueous solution under a higher pressure than the dispersion particle holding chamber. The liquid that has flowed out to the dispersed particle holding chamber through is sheared by the flow of the dispersed particle holding liquid to form droplets, and at least the surface of the droplets is gelled by the reaction between the droplets and the dispersed particle holding liquid. To produce an intermediate product, which is dried and granulated.

Further, the method for producing a deodorizing granule according to the fourth invention of the present application is characterized in that, in addition to the above requirements, the dispersion particle holding liquid is an aqueous solution of a metal salt which can be a polyvalent metal ion. is there.

Further, the method for producing a deodorizing granule according to the fifth invention of the present application is characterized in that, in addition to the above requirements, the dispersion particle holding liquid is an acid.

Further, the method for producing a deodorizing granule according to the sixth invention of the present application is characterized in that, in addition to the above requirements, the dispersion particle holding liquid is alcohol.

Further, the method for producing a deodorizing granule according to the seventh invention of the present application is characterized in that, in addition to the above requirements, the deodorizing fine powder is an oxide-based white deodorizing agent.

Further, an apparatus for producing a deodorizing granule according to an eighth aspect of the present invention comprises a dispersion particle holding chamber into which a dispersion particle holding liquid is injected in a stationary or flowing state in a fixed direction, and a dispersion stock solution containing deodorized fine powder. The dispersion stock solution supply chamber injected under pressure from the dispersion grain holding chamber is separated by a porous partition, and the dispersion stock solution is dropped from the dispersion stock solution supply chamber side to the dispersion grain holding chamber side via the porous partition wall. The dispersion stock solution extruded in the state or flowing from the dispersion stock solution supply chamber side to the dispersion grain holding chamber side via the porous partition wall is sheared by the flow of the dispersion grain holding liquid to form droplets. Things. It is an object of the present invention to achieve the above object.

[0016]

According to the present invention, the undiluted dispersion liquid is extruded from the undiluted dispersion supply chamber to the dispersed particle holding chamber through a plurality of small holes formed in the porous partition wall, and is formed into droplets by surface tension. Droplets can be manufactured at once.

When the dispersed particle holding liquid is caused to flow,
Since the undiluted dispersion flowing out from each small hole to the dispersed particle holding chamber side is sheared by this flow to form droplets of the undiluted dispersion, many droplets can be made in a short time,
Deodorizing granules having a wide range of particle sizes can be manufactured by changing parameters such as the pressure of the dispersion stock solution supply chamber and the flow rate of the dispersed particle holding solution.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. In the figure, reference numeral 1 denotes a granule production apparatus as an example for carrying out the method for producing a deodorized granule according to the present invention, which is, as an example, a top and bottom cover around a part of an inner pipe 2 having one end closed. It has a cylindrical shape having a portion 3a and a bottom portion 3b, and is provided with an outer pipe 3 so that its cross section is concentric with the inner pipe 2.

A raw dispersion liquid supply chamber 4 is formed inside the inner pipe 2, and a dispersed particle holding chamber 5 is formed at a portion surrounded by the inner surface of the outer pipe 3 and the outer surface of the inner pipe 2. Also, a large number of small holes 6 are formed in the entire cylindrical portion of the inner pipe 2 surrounded by the outer pipe 3,
Thereby, the dispersion liquid supply chamber 4 and the dispersion particle holding chamber 5 are connected to each other. The portion of the inner pipe 2 in which many small holes 6 are formed is defined as a porous partition 7.

In this embodiment, a part of the inner pipe 2 constitutes the porous partition wall 7 in order to adopt a double cylindrical structure of the inner pipe 2 and the outer pipe 3, but the granule manufacturing apparatus takes another form. In this case, what is essential is that the dispersion liquid supply chamber 4 and the dispersed particle holding chamber 5 are adjacent to each other, and the porous partition wall 7 is formed at the boundary.

As the form of the porous partition wall 7, a metal porous body such as a punching metal, a wire mesh or a metal fiber is appropriately applied, or a metal sintered body in a nozzle filter of a heavy oil burner, for example. Besides
For example, when the deodorizing granule is provided with other functions such as insect repellent, insect attractant, insect repellent or fragrance, multiple nozzles 10 as shown in FIG. The inner pipe 2 may be appropriately changed as shown in FIG.

Here, another embodiment of the granule manufacturing apparatus 1 will be briefly described. First, in the granule manufacturing apparatus 1 shown in FIGS. Can be reversed. That is, although not shown, one end of the outer pipe 3 is closed and the dispersion stock solution A is supplied in a pressurized state, while the dispersion particle holding liquid B is injected into the inner pipe 2,
The intermediate product S may be recovered from the central pipe.

The essential point is that the granule manufacturing apparatus includes a dispersion particle holding chamber and a dispersion liquid supply chamber which is more pressurized than this, and if a porous partition is provided between the chamber, the form and the parts The positional relationship does not matter.

The granule manufacturing apparatus 1 has the above-described structure. A method for manufacturing a deodorizing granule using the granule manufacturing apparatus will be described below. Here, the dispersion stock solution A and the dispersion particle holding solution B supplied to the holding chamber 5 will be described.

First, the deodorized fine powder contained in the dispersion liquid A is
A fine powder type deodorant having a particle diameter of the order of microns or submicrons. As an example, an aggregate of particles in which zinc oxide, titanium dioxide and water molecules are tightly bound (Japanese Patent Application Laid-Open No.
54935) and an aggregate of tightly-bound particles of zinc oxide and aluminum oxide and / or silicon oxide (JP-A-63-246167). Since the aggregate of these particles is white, it can be used for producing a white deodorizing granule. In addition, the deodorized fine powder may also be a white powder mainly containing a part or all of adsorbable oxides such as titanium oxide, zinc oxide, magnesium oxide, calcium oxide, aluminum oxide and silicon oxide. Other conventionally known materials can also be used.

Next, an aqueous solution of a water-soluble alginate serving as a dispersion medium for the dispersion stock solution A will be described. This is, specifically, an aqueous solution of sodium alginate, and ammonium alginate and the like can also be used. Here, sodium alginate will be described as a representative.

This sodium alginate is a substance that forms a cell membrane of brown algae such as kelp, scallop, and alame, and is used as an emulsion stabilizer, a thickener, a mold release agent, and the like. This substance is an extremely high-viscosity colloidal substance, has a strong hydrophilicity, and is well soluble in cold water and hot water, and has the property of being a very viscous and uniform solution. In addition, aluminum, barium, calcium, copper, iron, lead, zinc,
Addition of a metal salt such as nickel results in a water-insoluble alginate. Incidentally, the invention described in claim 4 utilizes such properties of sodium alginate.

When an acid is added to sodium alginate, it becomes a gel-like water-insoluble alginic acid. Incidentally, the invention described in claim 5 utilizes such properties of sodium alginate.

Next, the dispersed particle holding liquid B is described in claim 4,
As described in 5 and 6, an aqueous solution of a metal salt which can become a polyvalent metal ion, an acid or an alcohol can be applied.
First, the aqueous solution of a metal salt that can be a polyvalent metal ion in the invention of claim 4 specifically includes an aqueous solution of a salt of aluminum, barium, calcium, copper, iron, lead, zinc, nickel, or the like. That is, a metal that is insoluble or hardly soluble in water when combined with alginic acid is selected.
Incidentally, as one method of obtaining colored deodorizing granules, the color of a polyvalent metal ion can be developed, and examples thereof include reddish brown of iron ion, yellow blue of copper ion, blue purple of gold ion, and nickel ion. And pale yellow-green.

The acid in the invention according to claim 5 includes a strong acid represented by hydrochloric acid, sulfuric acid, nitric acid and the like, and a weak acid such as acetic acid which is stronger than alginic acid.

The alcohol in the invention according to claim 6 is a compound having a structure in which a hydrogen atom of a chain or alicyclic hydrocarbon or a hydrogen atom of a side chain of an aromatic hydrocarbon is substituted with a hydroxyl group. For example, there are methanol, ethanol and the like.

The dispersion stock solution A and the dispersion particle holding solution B are configured as described above.
First, the dispersion stock solution A is supplied to the dispersion stock solution supply chamber 4 under a constant pressurized state, and the dispersion grain holding liquid B is supplied to the dispersion grain holding chamber 5 from the intake port 8 and flows out from the discharge port 9. Thus, a steady flow from the upper side to the lower side of the dispersed particle holding chamber 5 is maintained. In addition, the flow form of the dispersed particle holding liquid B is such that the liquid is swirled around the porous partition wall 7,
The fluid may be caused to locally generate a vortex having a high shearing capability such as a helical flow around the porous partition wall 7.

In this way, the dispersion liquid A tends to flow toward the dispersion particle holding chamber 5 due to the pressure difference between the dispersion liquid supply chamber 4 and the dispersion particle holding chamber 5. The undiluted dispersion A that is going to flow out to the particle holding chamber 5 is sheared into droplets a as shown in FIG. While the droplet a is floating in the dispersion particle holding liquid B, the following reaction occurs depending on the type of the dispersion particle holding liquid B, and the droplet a is gelled from the surface of the droplet a to the center of the droplet. .

That is, when an aqueous solution of a metal salt that can become a polyvalent metal ion is used as the dispersion particle holding liquid B, the sodium ion of sodium alginate is replaced by a polyvalent metal ion such as calcium ion to form a water-insoluble gel. To form an intermediate product having a layer of calcium alginate formed on at least the surface.

When the acid is used as the dispersion particle holding liquid B,
The sodium ions of the sodium alginate are replaced by hydrogen ions, resulting in an intermediate product having a water-insoluble, gel-like layer of alginic acid formed on at least the surface.

Further, when alcohol is used as the dispersion particle holding liquid B, the water molecules in the hydrated state with the water-soluble alginate are dehydrated by the dehydration of the alcohol, so that the water-soluble alginate itself is insoluble in water. To form an intermediate product having at least a gel surface.

The intermediate product S that has gelled from the surface to the center of the droplet is discharged from the bottom 3b of the outer pipe 3 together with the dispersed particle holding liquid B, and only the intermediate product S is recovered by a net or the like. The intermediate product S thus recovered may be dried by external heating using a hot-air drying furnace or the like, or may be dried alone or in combination with external heating by self-heating by dielectric heating. Good. The size of the intermediate product S can be variously changed by changing the pressure applied to the dispersion stock solution A and the flow rate of the dispersion particle holding solution B.

Here, the dielectric heating is to place a heated object as a dielectric in an electric field in a high frequency band, and to constantly rotate the dielectric material in such a way that the dielectric molecules try to match the direction of the applied electric field, thereby causing friction with adjacent molecules. This is a heating method that applies the principle of generating heat from the inside due to this frictional heat, and is used for heating and drying foods, wood, etc. that contain moisture, and also for processing resin sheets, plastics, etc. It is. Generally, the characteristic of dielectric heating is that the time required for heating is short,
High heat efficiency, easy control of heating power, quick response, and relatively uniform heating of complex shapes are possible.If the intermediate product is dried by dielectric heating, the vaporized internal moisture Are swollen and released to the outside, and a foaming action is caused to some extent to obtain a swollen deodorized granule.

Incidentally, the expanded deodorizing granules have a large surface area, and therefore have a high deodorizing ability. still,
In order to produce a swollen deodorant granule, the intermediate product may be dried by a vacuum freeze-drying method. In addition, when an aggregate of particles in which zinc oxide, titanium dioxide, and water molecules are tightly bound is used as a deodorizing fine powder, the color changes when the temperature exceeds 100 ° C. during drying. To do it. Further, the dried deodorizing granules are fired to generate metal oxides (eg, calcium oxide) in the deodorizing granules, and water,
You may make it also exhibit the adsorption capability of carbon monoxide and carbon dioxide.

Further, as described above, when an acid is applied as the dispersion particle holding liquid B, a droplet a of sodium alginate is used.
Although the gel of alginic acid is formed by contact with hydrogen, the hydrogen of the gel of alginic acid is further substituted with a metal other than an alkali metal (for example, aluminum, barium, etc.), so that the catalyst function of the substituted metal can be performed in addition to the deodorizing function. Can also be obtained (see JP-A-1-343543).

Further, the dried deodorizing granules or the intermediate product S before drying can be put into, for example, a nonwoven fabric to form a sheet. Incidentally, as an example of such a method, there are Japanese Patent Application No. 2-24015 and Japanese Patent Application No. 2-24016.

Next, another method of forming droplets of the dispersion stock solution A using the granule manufacturing apparatus 1 will be described. In the above-described method, the dispersion particle holding liquid B is caused to flow to shear the dispersion liquid A to produce the droplets a. However, the dispersion particle holding liquid B does not necessarily need to flow, and the pressure of the dispersion liquid supply chamber 4 depends on the pressure. The dispersion stock solution A extruded from the small holes 6 of the porous partition wall 7 may be naturally formed into droplets by its surface tension, or a pressurized state applied to the dispersion stock solution A in the dispersion stock solution supply chamber 4. By periodically repeating pressurization and non-pressurization, a method in which the dispersion stock solution A instantaneously jumps out of the small holes 6 of the porous partition wall 7 to form droplets can be adopted. Of course, even when such a method is adopted, the dispersed particle holding liquid B may be caused to flow.

[0043]

According to the present invention, the dispersion particle holding chamber 5 and the undiluted liquid supply chamber 4 are partitioned by the porous partition walls 7, and the dispersed particle holding liquid B flows in the dispersion particle holding chamber 5 in a certain direction. On the other hand, a dispersion stock solution A in which deodorized fine powder is dispersed in a water-soluble alginate aqueous solution is supplied to the dispersion stock solution supply chamber 4 under a higher pressure than the dispersion particle holding chamber 5. What has flowed out to the dispersed particle holding chamber 5 through the flow of the dispersed particle holding liquid B is sheared into droplets, and at least the surface of the droplets is reacted by the droplet a and the dispersed particle holding liquid B. Since the intermediate product S is gelled to be dried and granulated, a large number of intermediate products S can be produced at one time according to the number of the small holes 6 of the porous partition wall 7, and the efficiency is improved. Good deodorizing granules can be produced. By changing the pressure of the dispersion liquid supply chamber and the flow rate of the dispersion particle holding liquid in various ways, deodorizing granules having various particle diameters can be easily and easily produced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an apparatus for producing a deodorizing granule of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is an enlarged longitudinal sectional view showing a porous partition wall portion of the same.

FIG. 4 is a longitudinal sectional view showing another embodiment of the porous partition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granule manufacturing apparatus 2 Inner pipe 3 Outer pipe 3a Lid 3b Bottom 4 Dispersion liquid supply chamber 5 Dispersion particle holding chamber 6 Small hole 7 Porous partition wall 8 Inlet 9 Discharge port 10 Nozzle A Dispersion liquid a Droplet B Dispersion particles Retentate S Intermediate product

Claims (8)

(57) [Claims] A porous partition wall separates a dispersion particle holding chamber and a dispersion stock solution supply chamber, and a dispersion stock solution in which deodorized fine powder is dispersed in a water-soluble alginate aqueous solution is stored in the dispersion stock solution supply chamber. The dispersion source solution is supplied in a pressurized state from the chamber, and this dispersion stock solution is extruded in the form of droplets through the porous partition wall toward the dispersion particle holding chamber, and the droplets are reacted with the dispersion particle holding solution to form at least the surface of the droplets. A method for producing a deodorizing granule, which comprises gelling an intermediate product, drying the granulated product and granulating the intermediate product. 2. The method for producing a deodorizing granule according to claim 1, wherein the pressurization of the dispersion liquid supply chamber is performed by a method of periodically repeating pressurization and non-pressurization. 3. The dispersion particle holding chamber and the raw dispersion liquid supply chamber are partitioned by a porous partition wall, and the dispersed particle holding liquid is caused to flow in a fixed direction in the dispersed particle holding chamber, while the deodorized fine liquid is supplied to the raw dispersion liquid supply chamber. An undiluted dispersion obtained by dispersing the powder in an aqueous solution of a water-soluble alginate is supplied under pressure from the dispersion particle holding chamber, and the undiluted dispersion liquid flowing out to the dispersed particle holding chamber through the porous partition wall is dispersed particles. The liquid is sheared by the flow of the retentate to form droplets, and at least the surface of the droplets is gelled by the reaction between the droplets and the dispersed particle retentate to form an intermediate product, which is dried and granulated. A method for producing a deodorizing granule, comprising: 4. The method according to claim 1, wherein the dispersed particle holding liquid is an aqueous solution of a metal salt that can be a polyvalent metal ion.
4. The method for producing a deodorizing granule according to 2 or 3. 5. The method for producing a deodorizing granule according to claim 1, wherein the dispersion particle holding liquid is an acid. 6. The method for producing a deodorizing granule according to claim 1, wherein the dispersion particle holding liquid is alcohol. 7. The method for producing deodorizing granules according to claim 1, wherein said deodorizing fine powder is an oxide-based white deodorizing agent. 8. A dispersion particle holding chamber into which the dispersion particle holding liquid is injected in a stationary or flowing state in a fixed direction, and a dispersion source liquid supply chamber into which a dispersion raw liquid containing deodorized fine powder is injected under a higher pressure than the dispersion particle holding chamber. Are separated by a porous partition wall, and the dispersion raw liquid is extruded in a droplet state from the dispersion raw liquid supply chamber side to the dispersed particle holding chamber side through the porous partition wall, or through the porous raw liquid supply chamber side through the porous partition wall. An apparatus for producing a deodorizing granule, characterized in that the undiluted dispersion flowing to the side of the dispersed particle holding chamber is sheared by the flow of the dispersed particle holding liquid to form droplets.