JP2023168008A - Solid chemical agent storage body and water treatment method - Google Patents

Abstract

The present invention provides a solid drug container configured to suppress the solid drug from forming bridges and gradually dissolve the entire amount of the solid drug, and a water treatment method using this solid drug container. SOLUTION: A storage container 10 having a storage space 13 capable of accommodating a plurality of water-soluble solid drugs, an inlet for allowing water to flow into the storage space 13, and an outlet for allowing water to flow out from the storage space 13. A solid drug container in which tablets T of water-soluble solid drugs are stacked and arranged in a storage space 13, and a water-insoluble film F is interposed between the layers of the tablets T. [Selection diagram] Figure 3

Description

The present invention relates to a solid drug container containing a water-soluble solid drug, and specifically, a solid drug that has the function of gradually dissolving the water-soluble solid drug by contact with the water to be treated and releasing it into the water to be treated. Regarding the containment body. The present invention also relates to a water treatment method for treating water using this solid drug container.

As a solid drug container that gradually dissolves water-soluble solid drugs into treated water, Patent Document 1 discloses a storage space that can accommodate a plurality of water-soluble solid drugs, and a storage space that allows the water to be treated to flow into the storage space. It has an inlet and an outlet for flowing out the water to be treated from the accommodation space, and a water-soluble solid drug is vertically stacked in the accommodation space with a water-soluble film interposed therebetween, and at least one of the water-soluble films is laminated in the accommodation space. A solid drug container is described in which a portion of the solid drug container is disposed above the inlet and the outlet.

According to this solid drug container, among the plurality of water-soluble solid drugs stored in the storage container, those that are not exposed to the flow path of the water to be treated formed between the inlet and the outlet of the storage container are Even when the drug directly below is dissolving, the presence of the water-soluble film reduces wetting, reducing the water content of the water-soluble solid drug compared to when used under the same conditions except for the presence of the water-soluble film. The residual rate of the active ingredient of the drug can be increased.

However, in the solid drug container of Patent Document 1, the water-soluble film is dissolved by moisture (water vapor, water droplets, rising water due to capillary action, etc.), and the solid drug on the upper side of the film absorbs moisture and swells. and sometimes formed a bridge.

As a method for preventing bridging of solid drugs, Patent Document 2 describes a method for preventing bridging by placing a weight (drop lid) on the top of a solid drug filled in a container and pushing down the solid drug with the weight of the weight. Are listed. Patent Document 3 describes, as a device for continuous and automatic elution, a solid drug continuous automatic elution device equipped with a solid drug eluator having a perforated inclined surface.

Japanese Patent Application Publication No. 2018-167239 JP2013-240778A Japanese Patent Application Publication No. 2000-117263

In the technique described in Patent Document 1, there was a risk that the water-soluble film would dissolve due to moisture, and the water-soluble solid drug located above the film would swell and form a bridge.

When a weight is installed in a container to prevent bridging, a space corresponding to the volume of the weight is required, and the amount of solid drug filled must be reduced. Furthermore, when using a solid drug eluator having a perforated inclined surface, parts with complicated shapes and structures are required in addition to the solid drug filling cylinder.

The present invention provides a solid drug container configured to suppress the solid drug from forming bridges and gradually dissolve the entire amount of the solid drug, and a water treatment method using this solid drug container. The task is to

The solid drug container of the present invention includes a storage container that has a storage space that can accommodate a plurality of water-soluble solid drugs, an inlet that allows water to flow into the storage space, and an outlet that allows water to flow out from the storage space. A solid drug container in which water-soluble solid drugs are stacked and arranged in the storage space is characterized in that a water-insoluble film is interposed between the layers of the solid drugs.

In one aspect of the present invention, the storage container includes a container body formed by fitting an upper member and a lower member, a partition wall that divides the inside of the container body into the accommodation space and the non-accommodation space; A partition wall communication path that communicates the accommodation space and the non-accommodation space so that water can flow between the accommodation space and the non-accommodation space, and functions as the inlet and outlet, and the inside and outside of the storage container. It has a container communication path that communicates with the container body and allows water to flow between the outside of the container body and the non-accommodating space.

In one aspect of the invention, the water-insoluble film is a synthetic resin film.

In one aspect of the invention, the synthetic resin is polyethylene or polyvinyl chloride.

In one aspect of the present invention, the area of the film is 1/2 or more, particularly preferably 80% or more, of the horizontal cross-sectional area of the accommodation space.

The water treatment method of the present invention is a water treatment method in which a solid drug is dissolved and added to the water to be treated. It is characterized by being added to treated water.

In the solid drug container of the present invention, by interposing a water-insoluble film between the solid drug layers, transmission of moisture (water vapor, water droplets, rising water due to capillary action, etc.) to the solid drug on the upper side of the film is suppressed. This suppresses the swelling of the solid drug. As a result, the formation of bridges by the solid drug is suppressed. Therefore, according to the solid drug container of the present invention and the water treatment method using this solid drug container, the components of the solid drug can be continuously dissolved in the water to be treated over a long period of time.

FIG. 1 is a perspective view schematically showing a storage container according to one embodiment of a solid medicine container. FIG. 2 is a longitudinal cross-sectional view of the solid drug container shown in FIG. 1. FIG. FIG. 3 is a schematic explanatory diagram of a state in which a solid drug is filled into a solid drug container. It is an explanatory view of the state of dissolution of the solid drug in the solid drug container.

The present invention will be explained in detail below. In this embodiment, a case will be described in which the water to be treated is cooling water of a cooling tower, but the water to be treated may be other water such as circulating water of a swimming pool.

[Storage container]
The storage container for the solid drug accommodating body of the present invention has an inlet that allows the water to be treated to flow into the container, and an outlet that allows the water to be treated that has flowed into the container to flow out of the container. For example, the storage container includes a cylindrical portion, an upper surface portion and a lower surface portion that seal both ends of the cylindrical portion, an inlet provided in the cylindrical portion and/or the lower surface portion, and an inlet provided in the cylindrical portion and/or the lower surface portion. and/or an outlet provided on the lower surface. Note that the inlet may also serve as the outlet.

FIG. 1 is a perspective view showing an example of a storage container, and FIG. 2 is a longitudinal sectional view thereof. This storage container 10 has a container body 11 having a substantially cylindrical shape. As shown in FIG. 2, the inside of the container body 11 is divided by a cylindrical partition wall 12 into a storage space 13 that stores a water-soluble solid drug and a non-storage space 14 that does not store a water-soluble solid drug. There is.

<Container body 11>
The container body 11 is composed of an upper member 11a and a lower member 11b. The upper member 11a has a top portion 11t, a cylindrical hanging wall 11r that hangs down from the outer peripheral edge of the top portion 11t, and a cylindrical partition wall 12 that hangs down from the top portion 11t. The hanging wall 11r and the partition wall 12 are coaxially provided. The lower member 11b has a bottom surface 11f and a side peripheral surface 11s.

Note that the hanging wall 11r, the partition wall 12, and the side circumferential surface 11s may have a shape other than a cylinder, such as an elliptical cylinder, a square cylinder, or a polygonal cylinder having more than five sides.

It is preferable that the upper member 11a and the lower member 11b have a structure that allows them to be separated and easily integrated (for example, a fitting structure). In this embodiment, the hanging wall 11r of the upper member 11a and the upper part of the side peripheral surface 11s of the lower member 11b are removably fitted together.

A hole 15a serving as a container communication path through which water can flow is provided in the top portion 11t of the upper member 11a. The hole 15a is arranged between the partition wall 12 and the hanging wall 11r in the top portion 11t. A plurality of holes 15a are arranged at approximately equal intervals in the circumferential direction. The non-accommodating space 14 communicates with the outside above the storage container 10 through this hole 15a.

A hole 15b serving as a container communication path through which water can flow is provided near the intersection of the side peripheral surface 11s and the bottom surface 11f of the lower member 11b. A plurality of holes 15b are arranged at approximately equal intervals in the circumferential direction.

A hole 15c as a container communication path through which water can flow is provided in the bottom surface 11f of the lower member 11b. The plurality of holes 15c are arranged approximately evenly over the entire bottom surface 11f.

<Division wall 12>
The partition wall 12 is suspended from the top 11t of the upper member 11a. The inside of the partition wall 12 is the accommodation space 13. The diameter (inner diameter) of the partition wall 12 is preferably about 20 to 200 mm, particularly about 50 to 70 mm. When the partition wall 12 is non-cylindrical, the horizontal cross-sectional area of the accommodation space 13 is preferably about 300 to 30,000 mm ² , particularly about 2,000 to 4,000 mm ² .

The outer diameter of the partition wall 12 is smaller than the inner diameter of the side peripheral surface 11s, and a non-accommodating space 14 is formed between the partition wall 12 and the side peripheral surface 11s.

A gap between the lower end of the partition wall 12 and the opposing bottom surface 11f of the lower member 11b serves as a partition wall communication path 16 that communicates the accommodation space 13 and the non-accommodation space 14. In this embodiment, the distance between the lower end of the partition wall 12 and the bottom surface 11f (the vertical width of the partition wall communication passage 16) is preferably 1 to 50 mm, particularly preferably 3 to 10 mm.

In this embodiment, the partition wall communication passage 16 functions as an "inflow port" and an "outflow port", and the holes (container communication passages) 15b and 15c function as "outflow ports".

Note that the shape, size, arrangement, and number of the partition wall communication passages 16 are not particularly limited as long as water can flow therethrough, and may be determined as appropriate depending on the desired flow rate of cooling water. can. The lower end of the partition wall is in contact with the bottom surface of the container main body facing thereto, and a water circulation hole is provided in a part between the partition wall and the bottom surface of the container main body. A wall communication passage may be formed.

The storage container 10 of this embodiment is made of transparent or translucent synthetic resin such as polypropylene, and allows easy visual observation of the state of the water-soluble solid drug inside the container from outside the container. This synthetic resin preferably has water resistance and chemical resistance.

[Water-soluble solid drug]
The water-soluble solid drug is not particularly limited, but examples include solid drugs that can be used as a water treatment agent for cooling water in cooling towers.

Water-soluble solid chemicals that can be used as water treatment agents for cooling water in cooling towers are preferably cooling water multi-chemicals containing phosphonic acid, azole copper corrosion inhibitors, calcium hydroxide, etc. A solid chlorine-based oxidizing agent such as calcium acid, trichloroisocyanuric acid, dichloroisocyanuric acid, chlorous acid, bromochloro-5,5-dimethylhydantoin (BCDMH), or other agents may be used.

The form of the water-soluble solid drug is preferably a disc-shaped tablet.

The tablet preferably has a diameter of 5 to 100 mm, particularly 10 to 30 mm, and a thickness of 1 to 50 mm, particularly 10 to 20 mm.

The number of tablet layers arranged in the container is preferably about 2 to 10, particularly about 5 to 6.

[Water-insoluble film]
As the water-insoluble film, a film made of a water-insoluble and water-impermeable synthetic resin is suitable, but metals, ceramics, etc. may also be used. Suitable synthetic resins include polyethylene and polyvinyl chloride.

The thickness of the water-insoluble synthetic resin film is preferably 1000 μm or less, for example about 10 to 100 μm. The shape of the water-insoluble film is not particularly limited and can be determined as appropriate.

In the present invention, the area of the water-insoluble film is 1/2 of the horizontal cross-sectional area of the storage space 13 (horizontal cross-sectional area when the solid drug container is installed so that the axial direction of the partition wall is in the vertical direction). It may be more than 80%, preferably 85% or more, particularly preferably 88% or more. Note that if this film is too large, the peripheral edge of the film will overlap the inner circumferential surface of the partition wall 12 when the film is placed in the storage space 13, resulting in poor workability. Furthermore, when the film overlaps the bottom of the container after the solid drug has been dissolved, there is a risk that the peripheral edge of the film may block the hole 15c in the bottom of the container. The area of the water-insoluble film may be, for example, 150% or less, 120% or less, or 100% or less of the horizontal cross-sectional area of the accommodation space 13. It is particularly preferable that the size of the film is less than or equal to the horizontal cross-sectional size of the accommodation space 13.

[Filling method for solid medicine]
In order to fill the storage space 13 with a solid drug consisting of a tablet, it is preferable to do as follows. That is, first, the upper member 11a and the lower member 11b are separated, and the upper member 11a is turned upside down, so that the partition wall 12 stands up from the top 11t. Then, a plurality of tablets are laid out on the top 11t. Lay out as many tablets as possible so that they do not overlap and have their side circumferences butted against or close to each other.

Next, one film (first film) is placed so as to cover the layer of tablets (first layer) laid out.

On top of this first film, tablets are laid out in the same manner as above to form a second layer, a film (second film) is placed on top of this, and this process is repeated. After the final layer of tablets is laid out, the upper member 11a and the lower member 11b are fitted and combined without overlapping the final tablet layer with a film. Next, the solid medicine container shown in FIG. 3 is constructed by vertically inverting the upper member 11a so that it is above the lower member 11b. T in FIG. 3 indicates a tablet, and F indicates a water-insoluble film.

[Dissolved form of solid drug in solid drug container]
When the solid drug container configured as described above is placed in a water falling area, water flows into the non-accommodating space 14 of the storage container 10 through the hole 15a, as shown in FIG. It collects at the bottom of the. This accumulated water W comes into contact with the tablet T in the lowermost layer, the tablet T in the lowermost layer gradually dissolves, and the solid drug-containing water flows downward from the holes 15b and 15c.

As the dissolution of the bottom tablet T progresses and the thickness of the bottom tablet layer becomes smaller, all the tablet layers above it gradually move downward.

When the tablets T in the bottom layer finish dissolving, the first film F from the bottom overlaps the bottom surface 11f of the lower member 11b, and after that, the tablets T in the tablet layer that was located second from the bottom when new are dissolved. do.

Thereafter, the tablet layer is sequentially dissolved in the same manner up to the uppermost tablet layer. FIG. 4 shows a situation in which the third of the six tablet layers has been dissolved, leaving three layers remaining.

In this embodiment, a water-insoluble film F is interposed between each tablet layer, and preferably the area of the water-insoluble film F is 1/2 or more of the horizontal cross-sectional area of the accommodation space 13. Moisture (water vapor, water droplets, rising water due to capillary action, etc.) from the water W in the container is prevented from coming into contact with the tablet T above the film F. Therefore, swelling of the tablet above the film F is suppressed, and bridging of the solid drug within the solid drug container is suppressed. As a result, chemicals are continuously added to the water to be treated.

[Example 1]
The solid drug container shown in FIG. 1 was placed in a cooling tower with an open circulation cooling water system for three weeks, and the presence or absence of bridging was observed. The main conditions are as follows <Container body 10>
Diameter (inner diameter) of side circumferential surface 11s: 83.85mm
Distance between side peripheral surface 11s and partition wall 12: 8.55 mm
Inner diameter of partition wall 12: 60.78mm
Height of partition wall 12: 61.0mm
Distance between the lower end of the partition wall 12 and the bottom surface 11f: 4.4 mm
Diameter and number of holes 15a: 4.6 mm, 16 pieces Diameter and number of holes 15b: 3.0 mm, 16 pieces Diameter and number of holes 15c: 10.0 mm, 10 pieces <Solid drug>
Type: Phosphonic acid, azole anticorrosive agent for copper Tablet diameter: 21.7mm
Tablet thickness: 10.7mm
<Water-insoluble film>
Resin: Polyethylene Thickness: 0.04mm (40μm)
Diameter: 70%, 80%, 85%, 90%, 92%, 95%, 100%, 110% or 120% of the inner diameter of the partition wall 12 (with respect to the horizontal cross-sectional area of the accommodation space 13 of the area of the water-insoluble film F) The ratio (hereinafter sometimes referred to as "film area ratio") is 49%, 64%, 72%, 81%, 88%, 94%, 100%, 121%, 144%)

<Experimental method>
The upper member 11a was removed from the lower member 11b, and on the top part 11t, five tablets of the solid drug T were arranged so as not to overlap, and one polyethylene film F was placed thereon. This was repeated until there were 5 layers in total. Next, the upper member 11a and the lower member 11b were combined to form a solid drug container.

Regarding this solid drug container, the solubility of the solid drug was evaluated in an open circulation cooling water system with a water temperature of 30°C. That is, the above-mentioned solid drug accommodating body is installed on top of the packing material in a countercurrent type (round type) open type cooling tower that has a refrigeration capacity of 30 USRT and operates 24 hours/day, and the solid drug is dissolved by the circulating water that is sprinkled. I let it happen.

After 3 weeks, the solid drug container was removed and the presence or absence of a bridge was determined.

<Results/Discussion>
Table 1 shows the observation results of the bridging situation.

As shown in Table 1, according to the present invention, it was possible to suppress the occurrence of bridging, and in particular, by setting the film area ratio to 88% or more, it was possible to sufficiently prevent the occurrence of bridging.

In addition, when the film area ratio was 121% or more, although bridging did not occur, work such as folding was required when filling the container, resulting in poor workability. Additionally, the polyethylene film that accumulated at the bottom of the container inhibited contact between the tablets and water. Therefore, it has been found that it is preferable that the size of the film is equal to or less than the horizontal cross-sectional size of the accommodation space 13.

[Comparative example 1]
The experiment was conducted under the same conditions as in Example 1, except that a polyvinyl alcohol water-soluble film with a thickness of 0.05 mm (diameter: 100% of the inner diameter of the partition wall 12, film area ratio: 100%) was used as the film. . As a result, after three weeks, a bridge had occurred inside the solid drug container. The evaluation result for the presence or absence of fringing in Comparative Example 1 was △ as shown in Table 1, and there was little bridging, but in Example 1, when the film area ratio was 100%, the same as Comparative Example 1 (evaluation result ◎: Comparative Example 1 had a poor bridging suppressing effect compared to the sample (no bridging occurred).

[Comparative example 2]
An experiment was conducted under the same conditions as in Example 1 except that no film was used. As a result, bridging was significantly observed after 3 weeks. Compared to all cases of Example 1 (film area ratio 49 to 144%), Comparative Example 2 was inferior in bridging suppressing effect.

10 Storage container 11 Container body 11a Upper member 11b Lower member 12 Partition wall 13 Accommodation space 14 Non-accommodation space 15a, 15b, 15c Hole (container communication path)
16 Compartment wall communication path F Water-insoluble film T Water-soluble solid drug tablet

Claims (8)

A water-soluble solid drug is placed in the storage space of a storage container that has a storage space that can accommodate a plurality of water-soluble solid drugs, an inlet that allows water to flow into the storage space, and an outlet that allows water to flow out from the storage space. In a solid drug container arranged in a stacked manner,
A solid drug container characterized in that a water-insoluble film is interposed between the solid drug layers. The storage container includes a container body formed by fitting an upper member and a lower member;
a partition wall that partitions the interior of the container body into the accommodation space and the non-accommodation space;
a partition wall communication path that communicates the accommodation space and the non-accommodation space to allow water to flow between the accommodation space and the non-accommodation space, and functions as the inlet and the outlet;
a container communication path that communicates between the inside and outside of the storage container and allows water to flow between the outside of the container body and the non-accommodation space;
The solid drug container according to claim 1. The solid drug container according to claim 1, wherein the water-insoluble film is a synthetic resin film. The solid drug container according to claim 3, wherein the synthetic resin is polyethylene or polyvinyl chloride. The solid drug container according to claim 1, wherein the area of the film is 1/2 or more of the horizontal cross-sectional area of the storage space. The solid drug container according to claim 1, wherein the area of the film is 80% or more of the horizontal cross-sectional area of the storage space. The solid drug container according to claim 1, wherein the water-soluble solid drug is a tablet. In a water treatment method in which a solid drug is dissolved and added to the water to be treated, the solid drug container according to any one of claims 1 to 7 is brought into contact with the water to be treated, thereby dissolving the solid drug and adding the solid drug to the water to be treated. A water treatment method characterized by adding water to the water.

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