JPH0716038A - Oxygen generator - Google Patents

Abstract

PURPOSE:To obtain an oxygen generator capable of effectively generating oxygen gas over a long period, having excellent handleability and useful as a source for supplying dissolved oxygen necessary for living fish, crustaceans, etc., by packing a specific oxygen-generating agent and a specific water-soluble package in a container. CONSTITUTION:This oxygen generator 1 is produced by using an oxygen- generating agent 11 capable of generating oxygen gas by reacting with water, e.g. a combination of sodium carbonate and an adduct of hydrogen peroxide and potassium or calcium and a catalyst 10 such as manganese dioxide to allow the generation of oxygen gas from the oxygen-generating agent 11 at normal temperature or low temperature, charging a container 2 with the oxygen- generating agent and the catalyst and putting a water-soluble packaging material 12 such as PVA sheet into the container 2 to disperse, as necessary, the oxygen gas generated in water out of the container 2 in a stabilized state immersed in water or floating on water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses live fish, crustaceans, shellfish and the like (herein, referred to as "seafood") for temporary storage and transportation in water, and it is possible to reduce the amount of dissolved oxygen required by organisms. It relates to an oxygen generator used as a supply source.

[0002]

2. Description of the Related Art Conventionally, it has been known to use an oxygen generating material such as sodium peroxide or calcium peroxide as a peroxide to generate oxygen, for example, in Japanese Examined Patent Publication No. 62-12163.
And JP-A-54-26990.
Further, as an example of using these oxygen generating materials as a composition as a package, the use of the oxygen generating composition packaged in a multiple structure is disclosed in, for example, JP-A-1-103902. On the other hand, an oxygen generator such as peroxide is placed in a container, water and a catalyst are added to generate oxygen gas, which is led to an outer tube and a gas dispersion device through a precision membrane that is oxygen permeable and water impermeable, and is used for live fish. Supplying dissolved oxygen to a water tank or the like has also been proposed, for example, in JP-A-63-285102.

[0003]

However, it is difficult for these known oxygen generating agents to stably and stably supply dissolved oxygen to living organisms over a long period of time. That is,
It is difficult to generate a large amount of oxygen when the oxygen generator is wrapped in a packaging material, while in the oxygen generator that stores the oxygen generator in a container and diffuses the oxygen gas from an external pipe and a gas dispersion device, It was necessary to add a catalyst to the stored peroxide immediately before generating oxygen and to close the container, which was a complicated operation in practice, and gas leakage and the like were difficult in practice.

[0004]

The above problems can be solved by the present invention. That is, the oxygen generator of the present invention contains an oxygen generating agent capable of reacting with water to generate oxygen gas inside the container, and is generated in the water outside the container in a stable posture in water or in a floating state as needed. An oxygen generator for dispersing oxygen gas, which is characterized in that a water-soluble package containing catalysts for generating oxygen gas from the oxygen generating agent at room temperature or at low temperature is contained in the container.

In a preferred embodiment of the present invention, the oxygen generating agent is sodium and potassium carbonate, a hydrogen peroxide adduct of calcium, sodium perborate, urea hydrogen peroxide,
It is possible to use a peroxide selected from sodium persulfate, potassium persulfate, and calcium peroxide, which is solid at room temperature. In another aspect, the oxygen generating agent may include a sodium carbonate hydrogen peroxide adduct. Further, in another embodiment, the oxygen generating agent may include a mixture of sodium carbonate hydrogen peroxide adduct and calcium peroxide.

In a preferred embodiment of the present invention, the catalysts are selected from the group consisting of manganese dioxide, manganese sulfate, sodium bismuthate or cobalt chloride metal compounds and activated carbon, zeolite, silica gel, or a catalyst carrier compound of acid clay. At least one can be used.

In a preferred embodiment of the present invention, at least one of the materials for the water-soluble package is at least one selected from natural pulps, sheets containing polyvinyl alcohol as a main component, papers and films. You can

In a preferred embodiment of the present invention, a gas dispersion means is provided at the bottom of the container and diffuses the generated oxygen gas into the water outside the container, and the generated oxygen gas is guided from the inside of the container to the gas dispersion means, and the inside of the upper part of the container. Has an opening in
The container is integrally arranged along the outer wall of the container and is provided with an air guiding pipe connected to the gas dispersion means, a raw material inlet is formed at the top of the container, and an opening of the air diffusing pipe is arranged at the raw material inlet.
An inner stopper for leak prevention is arranged on the back surface of the upper lid for raw material charging,
A wave-eliminating material arranged near the liquid surface of the internal liquid containing the oxygen generating agent is housed inside the container. In the present invention, catalysts are used together as a means for controlling the oxygen generation amount per unit time and the generation duration time.

The oxygen generator used in the present invention is
The oxygen gas is physically or chemically generated, and its type is not particularly limited. As a preferable oxygen generating agent, there is an oxygen generating agent capable of reacting with water to generate oxygen gas. The shape is preferably solid or powder before the reaction. Specifically, peroxides that are solid at room temperature, preferably the peroxide is a hydrogen peroxide adduct such as sodium carbonate, potassium carbonate, calcium carbonate, sodium perborate, urea hydrogen peroxide, sodium persulfate. , At least one selected from potassium persulfate and calcium peroxide. According to the present invention, the oxygen generating agent contained in the container can be packed in a bag to prevent fluidization of the oxygen generating agent, destabilization of the posture of the container due to the fluidization, and leakage thereof. The peroxide used here is
Among those that react with water to generate oxygen gas, the amount of oxygen generated can be controlled, and for example, it can be used as an oxygen supply source for transporting live fish.

In order to generate oxygen gas from these compounds, various catalysts, pH adjusters, organic acids and the like can be used. At this time, if necessary, plaster as a water retention agent,
It is preferable to use zeolite, activated carbon, activated alumina, a natural or synthetic polymer absorbent alone or in combination as a mixture. Water used includes tap water, fresh water such as well water and river water, and seawater containing sodium chloride as a main component.

A catalyst is used when oxygen is generated from the peroxide. It is selected in consideration of the type of peroxide to be used and the amount of intended oxygen gas generated per unit time, but it is usually a metal oxide such as cupric oxide, aluminum oxide, magnesium oxide, manganese dioxide, and second oxide. Iron, iron sesquioxide, etc., sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, etc. as alkaline substances, manganese sulfate, etc. as metal salts, sodium bismuthate, etc. as oxyacid salts, etc. It can be used directly or separately from other composition mixture in a state of being wrapped with a suitable packaging material such as nonwoven fabric.

[0012]

In the oxygen generator of the present invention having the above structure,
It works as follows. In order to separate the catalyst from the oxygen generating agent, it is previously encapsulated with a water-soluble material and stored in an oxygen generating container with the oxygen generating agent, and by pouring predetermined water when oxygen generation is required, the water-soluble material is dissolved and included. The formed catalyst contacts the oxygen generating agent, and oxygen gas generation is started. The water-soluble material is not affected by normal changes in temperature and humidity, and is completely separated from the oxygen generating agent and stored in the generating container until water injection.

As described above, oxygen gas is generated by reacting with the catalyst in the water system in the oxygen generation container. The generated oxygen reaches the dispersion port of the air diffuser (gas dispersion means) through a connecting pipe such as a conduction pipe. Fine bubbles are diffused into the water through the dispersion port and dissolved in the water as dissolved oxygen. This effect is
It is used as an extremely effective means in the small live fish transportation industry.

[0014]

EXAMPLES The present invention will be described more specifically below with reference to examples. [Apparatus Example] FIG. 1 is a schematic vertical sectional view of an embodiment of the oxygen generator according to the present invention as seen from the front. 2 and 3
FIG. 1 shows a schematic perspective view and a cross-sectional view of a water-soluble package containing the catalysts.

The oxygen generator 1 of this embodiment is in a state before injecting water, is provided in the container main body 2 in which the oxygen generating agent is housed, and is provided at the bottom of the container, and the generated oxygen gas is discharged outside the container. Gas dispersion means to disperse in water (air stone)
4 and the generated oxygen gas from the inside of the container to a gas dispersion means 4
And an air guide pipe 6 which has an opening 5 inside the upper part of the container, is integrally arranged along the outer wall of the container 2, and is connected to the gas dispersion means 4, and contains the catalysts 10. The sex package 12 is housed inside the container.

The water-soluble package is one in which at least a part of the package is water-soluble and is melted and broken by water. 2 and 3 show examples of the water-soluble package. In the embodiment shown in FIG. 2, the catalysts 10 are packaged with the water-soluble paper 12a and the water-insoluble 12b, and the peripheral portion is sealed. In the embodiment shown in FIG. 3, the catalysts 10 are loaded in the non-water-soluble container 12c, and the opening is closed with the water-soluble paper 12a.

In this embodiment, the raw material charging port 3 is formed at the top of the container, and the diffusion tube opening 5 is arranged at the raw material charging port.
The opening 5 is closed by an inner plug (hollow foamed polyethylene) 8 provided on the back side of the raw material inlet upper lid 7. The inner plug 8 used for the opening in this embodiment can be prepared from foamed polyethylene, other sponge, cloth, cotton or the like. Further, preferably, the inner plug can be changed before and after water injection for oxygen generation. Furthermore, the upper air duct 6
In addition, a liquid reservoir 9 for preventing leakage of the internal liquid is formed, and the upper air guide pipe is designed to be inclined toward the opening 5 side so that even if the internal liquid 10 enters the air guide pipe, it is easily returned. ing.

In the mode of this embodiment, the wave-eliminating material 12 arranged near the liquid surface of the internal liquid after water is injected is housed inside the container. The wave breaking material 12 is made of polyurethane foam and has a plate shape corresponding to the shape of the inner cross section of the container.

The oxygen generator of the above embodiment is used and operates as follows. When transporting before water injection, use solid polyurethane foam inner plugs. By using such an inner plug, it is possible to prevent the oxygen generating agent of granular powder from being mixed into the air guide tube due to vibration or shaking. When oxygen is about to be generated, the upper lid 7 and the urethane inner stopper are removed, and a predetermined amount of water (tap water, seawater, etc.) is injected.
As a result of water injection, the water-soluble package melts and breaks, and the catalysts inside go out. Further, the water and the oxygen generating agent react with each other by the catalysts to generate oxygen gas. The generated oxygen gas collects in the upper space of the container, further enters the air guide pipe 6 through the opening 5 through the packing, and reaches the dispersion port of the gas dispersion means 4 through the inside of the air guide pipe. Fine bubbles are diffused into the water through the dispersion port.

In the oxygen generator of this aspect, the air guide pipe 6 integrally arranged along the outer wall of the container body 2 is integrally formed with the container when the container is formed. By integrally molding with the container as described above, the oxygen generator can be manufactured more economically and efficiently, which is preferable. For example, live fish box 1
If there is shaking / vibration during transportation of 5, the oxygen generator 1
The whole may vibrate, causing waves on the surface of the internal liquid. However, in this aspect, since the wave-eliminating material 12 is provided inside the container, the internal liquid is stably maintained, and the internal liquid does not leak from the opening in the upper part of the container. The present invention is not limited to the above embodiment, and various modifications are possible.

Example 1 Sodium percarbonate (sodium percarbonate manufactured by Mitsubishi Gas Chemical Co., Inc.) 200 as an oxygen generating component
g is placed in the oxygen generator of FIG. Separately, 2 g of manganese dioxide is wrapped in water-soluble paper (water-soluble paper manufactured by Mishima Paper Manufacturing) as shown in FIG. 2 and inserted into the container containing the sodium percarbonate. When this container was left in a room under conditions of high temperature and high humidity with a temperature of 40 ° C. and a humidity of 90% for 1 month and 3 months and the change in the effective oxygen concentration of sodium percarbonate was measured, the change was as shown in Table 1. I couldn't see it.

[Comparative Example 1] The manganese dioxide of Example 1 was added to the sodium percarbonate in the generating container as it was without being packaged in water-soluble paper, and under the same conditions as in Example 1 under high temperature and high humidity. The change in the available oxygen component was measured at 54.3% for one month and 84.% for three months as shown in Table 1.
The available oxygen was reduced by 5%.

[0023]

[Table 1]

[Embodiment 2] Water of 5 ° C. was added to a generator containing an oxygen generating agent, which was left under high temperature and high humidity of Embodiment 1 for 1 month.
After putting cc and closing the cap, it was placed in a water tank (20 liters) with water temperature of 5 ° C containing 5 live flakes. 2 minutes later, oxygen gas was diffused and diffused into the water from the diffuser pipe, and oxygen gas was continuously supplied. Continued to occur. The generation amount and duration are shown in Table 2 and Figures 4 and 5, and one day and two nights are required to transport live flounder.
Stable oxygen gas was generated even after 4 hours. All five live flocks in the aquarium were alive.

COMPARATIVE EXAMPLE 2 Water of 600 ° C. at 5 ° C. was stored in the generator containing the oxygen generating agent which was left under high temperature and high humidity of Comparative Example 1 for 1 month.
After putting cc and closing it, put it in a water tank (20 liters) containing 5 live flakes and a water temperature of 5 ° C. 2 minutes later, oxygen gas was diffused and diffused into the water from the diffuser pipe, and oxygen gas was rapidly released for several hours. However, after 5 hours had elapsed, the amount of the generated abruptly decreased, and after 6 hours, the generation had almost ended. The five live flounders in the aquarium became dead after 6 hours when oxygen generation had almost disappeared. The generation amount and the duration are shown in Table 2 and FIGS.

[0026]

[Table 2]

As demonstrated in the above Examples and Comparative Examples, the combined use of catalysts in contact with an oxygen generating agent is a major obstacle to practical use because the amount of effective oxygen decreases with the passage of time, that is, the amount of generated oxygen decreases. However, in order to eliminate the obstacle, the present invention has been solved by encapsulating a catalyst in water-soluble paper and allowing the oxygen-evolving peroxide to coexist in the generation container.

[0028]

The oxygen generating agent according to the present invention can effectively generate a large amount of oxygen gas in a constant amount over a long period of time. In seawater, this oxygen gas is used for high-grade fish such as blowfish, live sea bream, live flounder, and live prawns.
Transport of crustaceans and shellfish such as octopus, salmon, abalone, clams, and clams, and transporting seedlings such as eel, dojo or jujube in freshwater systems,
It is extremely suitable as an oxygen supply material required for holding. Especially, it is possible to supply oxygen stably for at least 24 hours for air cargo and small cargo (including courier etc.) that is strict in terms of dangerous material management, and safely achieve the purpose. It is extremely excellent in that it does not require any special consideration in handling because it can be disposed of together with ordinary garbage.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of an oxygen generator before water injection according to the present invention.

FIG. 2 is a schematic view of an embodiment of a water-soluble package used in the oxygen generator according to the present invention.

FIG. 3 is a schematic view of an embodiment of a water-soluble package used in the oxygen generator according to the present invention.

FIG. 4 is a graph showing a time course of an oxygen generation amount per hour in Example 2 and Comparative Example 2.

FIG. 5 is a graph showing the time course of the total oxygen generation amount in Example 2 and Comparative Example 2.

[Explanation of symbols]

 1 Oxygen Generating Container Main Body 2 Lid 3 Oxygen Generating Agent 4 Water-Soluble Paper 5 Catalyst 6 Wave Absorbing Material 7 Diffuser 8 Inner Plug 9 Liquid Reservoir 10 Catalyst Internal Liquid 11 Oxygen Generating Agent 12 Water-soluble Package

Claims (7)

[Claims] 1. An oxygen generating agent capable of reacting with water to generate oxygen gas is contained in a container, and the oxygen gas generated is dispersed in water or outside the container in a stable posture in a floating state, if necessary. An oxygen generator, characterized in that a water-soluble package containing a catalyst for generating oxygen gas from the oxygen generator at room temperature or at a low temperature is housed inside a container. 2. The oxygen generating agent is selected from sodium and potassium carbonate, hydrogen peroxide adduct of calcium, sodium perborate, urea hydrogen peroxide, sodium persulfate, potassium persulfate, and calcium peroxide at room temperature. The oxygen generator of claim 1 including a peroxide that is solid. 3. The oxygen generator of claim 1, wherein the oxygen generator comprises sodium carbonate hydrogen peroxide adduct. 4. The oxygen generator of claim 1, wherein the oxygen generator comprises a mixture of sodium carbonate hydrogen peroxide adduct and calcium peroxide. 5. The catalyst is at least one selected from the group consisting of manganese dioxide, manganese sulfate, sodium bismuthate or cobalt chloride metal compounds and activated carbon, zeolite, silica gel or a catalyst carrier compound of acidic clay. The oxygen generator according to claim 1. 6. The oxygen generation according to claim 1, wherein at least one kind of material of the water-soluble package is at least one kind selected from natural pulps, sheets containing polyvinyl alcohol as a main component, paper and film. vessel. 7. A gas dispersion means provided at the bottom of the container to diffuse the generated oxygen gas into water outside the container, and guide the generated oxygen gas from the inside of the container to the gas dispersion means,
The container has an opening inside the upper part of the container, is integrally arranged along the outer wall of the container, and is provided with an air guide pipe connected to the gas dispersion means, and a raw material inlet is formed at the top of the container. The opening of the air diffuser is located in the container, the leak prevention inner plug is located on the back side of the raw material inlet upper lid, and the wave-eliminating material located near the liquid surface of the internal liquid containing the oxygen generating agent is inside the container. The oxygen generator of claim 1 housed in.