JPH0494703A - Gaseous co2 adsorbing material - Google Patents

Abstract

PURPOSE:To make gaseous CO2 in water efficiently adsorbed by sealing a gaseous CO2 adsorbent in a bag-shaped vessel composed of an air permeable but water impermeable sheetlike substance forming at least a part of the vessel and a water impermeable sheetlike substance forming the remainder. CONSTITUTION:A gaseous CO2 adsorbent 5 such as soda lime is sealed in a bag-shaped vessel composed of an air permeable but water impermeable sheetlike substance 2 forming at least a part of the vessel and a water impermeable sheetlike substance 3 forming the remainder. When the resulting gaseous CO2 adsorbing material is used, gaseous CO2 in water can be efficiently adsorbed and removed and fished can be transported at high density in the lively state.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a carbon dioxide adsorbent for adsorbing and removing carbon dioxide gas, and more specifically, it relates to carbon dioxide concentration in water during live fish classification and transportation. The present invention relates to a carbon dioxide adsorbent for adsorbing and removing carbon dioxide dissolved in water, which is used to suppress the rise of carbon dioxide.

(Prior art and its problems) The technology of removing carbon dioxide gas dissolved in water and controlling the concentration of carbon dioxide gas in an aqueous solution from becoming high is well known. In particular, by keeping the concentration of carbon dioxide dissolved in the water used during the transport of live fish classification low, it is possible to prevent the carbon dioxide concentration in the water from increasing by -1- when transporting highly fresh live fish classification over long distances. Carbon dioxide adsorbent is used.

That is, recent dietary habits have changed significantly, and with the so-called gourmet trend, there is a need to transport seafood in a live state to consumption areas. Furthermore, when transporting young fish from production areas to aquaculture areas, there is a need for a method that can be carried out economically and at low cost while keeping them as healthy as possible.

In this so-called live fish transportation, from an economic standpoint, it is required to transport as much seafood as possible in as small a container as possible. At the same time, it is also required to deliver the fish to its destination without sacrificing its freshness, and there is a need for a mode of transportation that satisfies these demands at the same time.

Conventionally, in response to such demands, in live fish transportation,
Various conditions such as water temperature, ambient air temperature, and oxygen concentration are adjusted during transportation, but no good solution has yet been found for regulating carbon dioxide concentration.

Live fish emit carbon dioxide gas when they breathe through their gills, so if a large amount of live fish is transported in a narrow container, the amount of carbon dioxide gas will increase.
The amount of water discharged also increased, leading to an increase in the carbon dioxide concentration in the water in container H during transportation, which did not immediately cause the pH of the plant to change to the acidic side. When the carbon dioxide concentration increases, even if there is only one fraction of oxygen in the water? ? Even if you do, live fish can cause suffocation. For example, when transporting live sweetfish, it is said that it is preferable to maintain the dissolved carbon dioxide concentration in the water at 50 mg/L or less. If the dissolved carbon dioxide concentration increases and the
It is known that if the concentration exceeds g/L, the sweetfish will die even if the dissolved oxygen concentration is sufficient. In other words, it can be said that an increase in dissolved carbon dioxide concentration is an important technical issue that must be avoided at all costs when transporting live fish.

Methods for preventing an increase in the concentration of dissolved carbon dioxide in water include (11) For example, as described in Japanese Patent Application Laid-Open No. 58-2648, there is a method of blowing air or other gas into water. is known, but although this method makes it possible to remove carbon dioxide, it is difficult to keep the water temperature low during transportation, and there is still room for improvement.

(2) Another method is to put carbon dioxide adsorbents directly into the water, but many commonly known carbon dioxide adsorbents react with water in water and turn into substances that have no positive effect on live fish. Therefore, this method is not practical.

(3) Furthermore, attempts have been made to remove the carbon dioxide gas by wrapping the carbon dioxide adsorbent in a polyvinyl chloride sheet so that the carbon dioxide gas in the water dissolves and diffuses through the sheet, but the effect of removing carbon dioxide gas is small and is not practical. It cannot be said to be a target.

(4) Furthermore, a method using an ion exchange resin is also considered, but although there is no fear that the ion exchange resin will react with water and turn into a substance that has a negative effect on live fish, this method also uses carbon dioxide. The gas removal ability is extremely poor, and it cannot be said to be of practical use.

(Object of the Invention) Therefore, an object of the present invention is to provide a carbon dioxide adsorbent having a simple structure and capable of efficiently adsorbing and removing carbon dioxide gas in water.

A further object of the present invention is to provide an underwater carbon dioxide adsorbent that makes it possible to transport live fish in a high-density state while keeping them alive.

(Means for Solving the Problems) The present invention has been proposed to achieve the above object, and according to the present invention, a sheet at least partially air permeable and water impermeable. There is provided a carbon dioxide adsorbent characterized in that a carbon dioxide adsorbent is placed 1:1 in a bag-like container whose entire surface is made of a water-impermeable sheet-like material.

The carbon dioxide adsorbent of the present invention can also be used by putting it into water as it is, but for example, it can be in the form of a plate made of wood, plastic, metal, etc., which has a specific gravity higher than that of water, preferably a specific gravity of 1.1 or more. By bonding and fixing the carbon dioxide adsorbent to one or both sides of the object, the carbon dioxide adsorbent does not float on the water surface (sinks into the water) and achieves a stable carbon dioxide adsorption effect.

In addition, if the air-permeable surface of the carbon dioxide adsorbent is used as the front surface and a bag-shaped container containing an oxygen generating agent is attached to the back side, this oxygen generating agent usually has a specific gravity of 1 or more, so this becomes the weight. It fulfills its role and sinks into the water, and simultaneously performs two functions: adsorbing carbon dioxide gas on one side and generating oxygen on the other side, effectively preventing increases in carbon dioxide concentration. A carbon dioxide adsorbent is provided.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, which shows a perspective view of one example of the carbon dioxide adsorbent of the present invention, l indicates a carbon dioxide adsorbent, and this carbon dioxide adsorbent is made of a bag-like container filled with a carbon dioxide adsorbent. The bag-like container has at least a portion thereof air permeable;
It is also composed of a water-impermeable sheet 2. The seams 1 to 2 may be appropriately used as long as they are air-permeable and water-impermeable; examples thereof include:
Examples include porous membranes made of polyolefin, polystyrene, polyester, polyamide, polyurethane, fluorocarbon resin, silicone resin, and the like.

Among these, polyolefin porous membranes are particularly preferably used because of their excellent water repellency. Polyolefins include polyethylene, polypropylene, poly-4
-Methylpentene-1 etc. are exemplified. These porous membranes have ultrafine pores of about 0, 2 to 2 microns throughout the membrane, and these pores communicate with each other to form a so-called open cell membrane, allowing gas to flow freely to a certain extent. However, water does not pass through the pores due to the hydrophobic nature of the wall material that forms them.

Is it preferable to use this air-permeable, water-impermeable sheet in as large an area as possible on the entire front and back sides of the bag-like container from the viewpoint of carbon dioxide adsorption effect? Approximately 20 to 100% of the area of one side of the shaped container
It is preferable that it be provided in the center of the surface at a ratio of .

Further, as the sheet 3 that forms the bag-like container together with the sheet, a film or sheet made of water-impermeable thermoplastic synthetic resin or the like is appropriately used.

FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1.

5 is a carbon dioxide adsorbent, and any carbon dioxide adsorbent may be used as long as it is the carbon dioxide adsorbent of X11, but among them, soda lime (calcium hydroxide) is particularly preferred. The carbon dioxide adsorbent may have any shape, but granular ones are usually used, and the size of the particles can be selected as appropriate.

The carbon dioxide adsorbent shown in FIG. 1 is produced by, for example, overlapping the edges of a sheet consisting of a water-impermeable sheet 3 and an air-permeable sheet 1 to 2 or a sheet 3 on which sheet 2 is partially formed.
A carbon dioxide adsorbent is sealed in a bag-like container manufactured by heat-sealing the end surface 4, and the filling capacity of the bag-like container is
” can be easily manufactured by heat sealing.

At this time, if the air permeable sheet 2 is partially provided on the water impermeable sheet 3, the end surfaces of the sheets 2 and 3 are also joined by heat sealing.

FIG. 3 is a sectional view showing an example in which the carbon dioxide adsorbent of the present invention is bonded to one side of a plate-like material 6. Although the size of the plate-like material 6 is not particularly limited, it is usually preferably approximately the same size as the carbon dioxide adsorbent.

As a special example, the plate-shaped object can be used as a partition plate when transporting a small number of live fish, such as one or two, by partitioning an aquarium or a 2K capacity tank for transporting live fish,
In this case, a plate-like material of an appropriate size is used as the partition plate, and a carbon dioxide adsorbent is bonded to one or both sides of this plate-like material.

Figure 4 shows the situation, with 8 indicating the water tank;
Reference numeral 6 is a plate-like material serving as a partition plate, and a carbon dioxide adsorbent is bonded to one or both sides of the plate-like material.

FIG. 5 shows an example in which the carbon dioxide adsorbent of the present invention is bonded to both sides of a plate-like object. As mentioned above, it is preferable to use a plate-shaped material with a specific gravity higher than that of water, but if the material of the plate-shaped material is smaller than the specific gravity of water, it is necessary to use a material inside or outside of the carbon dioxide adsorbent. Adding weights will prevent it from floating on the ice surface.

It is preferable that a layer of nonwoven fabric 7 is further provided on the inner surface of the bag-like container constituting the carbon dioxide adsorbent of the present invention. By adopting such a configuration, it is possible to prevent the carbon dioxide gas adsorbent sealed inside from flowing and becoming biased to one side, resulting in an unstable shape and reducing the carbon dioxide gas adsorption effect to a low F. The nonwoven fabric layer acts as a buffering agent, and can also serve as a shock absorbing material when the fish comes into contact with the carbon dioxide adsorbent during transportation of live fish.

As the nonwoven fabric, those manufactured from raw material fibers such as rayon, vinylon, nylon, acrylic, polyester, etc. can be used, and furthermore, either dry-laid nonwoven fabrics or wet-laid nonwoven fabrics can be used.

The carbon dioxide adsorbent of the present invention can be used during transportation of live fish, etc.
Although it is used by being submerged in water, the sheet that makes up the bag-like container is impermeable to moisture, so moisture does not penetrate inside and react with the carbon dioxide adsorbent, and at least a portion of this sheet Since it is permeable to air, only the gas dissolved in the water permeates through this sheet and comes into contact with the carbon dioxide adsorbent, making it possible to selectively adsorb and remove carbon dioxide gas.

The size of the carbon dioxide adsorbent and the amount of carbon dioxide adsorbent sealed therein are not particularly limited, and are subject to various factors such as the type of fish to be transported, the amount and size of the fish, and the time required for transport. Although it is determined appropriately depending on the factors, usually a bag-like container with a size of 1 x 10 cm to 2 (1 x 2 cm) culm size is filled with about 20 to 100 g of carbon dioxide adsorbent. It is preferable to use the bag-like container according to the requirements, and the shape of the bag-like container is not limited to a square, but can be rectangular or any other arbitrary shape.

(Effects of the Invention) The carbon dioxide adsorbent of the present invention has carbon dioxide adsorption performance in water because at least a portion thereof is composed of an air-permeable and water-impermeable sheet. By integrally bonding it to a flat plate-like material, it can be used as a carbon dioxide adsorbent in an aquarium when transporting live fish, and it can also be used as a container with a phase shape of 1 to 1. Because of this, it does not take up much space and is easy to sink into water, making it easy to handle. In addition, by forming a layer of nonwoven fabric inward of the container, it is possible to prevent the carbon dioxide adsorbent sealed in the carbon dioxide adsorbent from becoming uneven, and the adsorption area can be maintained in a wide state, making it possible to efficiently absorb carbon dioxide. (At the same time, the layer of non-woven fabric acts as a buffer material, preventing fish from being damaged by contact with the carbon dioxide adsorbent. Furthermore, this carbon dioxide adsorbent can be When used together with the oxygen generating agent, the specific gravity of the oxygen generating agent is usually large. Not only that, but also has a carbon dioxide adsorption effect,
Combined with the oxygen generation effect, an efficient IF effect to prevent increase in carbon dioxide concentration is achieved.

(Example) One side is a porous membrane made of polyethylene with a diameter of H] - A bag-like container 23 was prepared which was heat-sealed in width. This bag-shaped container was filled with 211 r of soda lime, and the entrance of the bag was similarly heat-sealed to a width of 3 mm to produce a carbon dioxide adsorbent.

If the surface of the polyethylene sheet of this carbon dioxide adsorbent is
lx Iox O, bonded to a 5 cm rigid plastic plate, was lowered to the bottom of an aquarium containing 100 g of seawater with the porous membrane surface as the open surface.

When five medium-sized adult flounders were placed in this aquarium and their condition was observed 100 hours later, there was no change in the condition of the live fish.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the carbon dioxide adsorbent of the present invention, Fig. 2 is a sectional view taken along the line Δ-A' in Fig. 1, and Fig. 3 is a perspective view showing an example of the carbon dioxide adsorbent of the present invention. FIG. 4 is a cross-sectional view showing an example of a state in which the carbon dioxide adsorbent of the present invention is bonded to one side of a plate-like object; FIG. , FIG. 5 is a sectional view showing an example of a state in which the carbon dioxide adsorbent of the present invention is bonded to both surfaces of a plate-like object. In the figure 1... Carbon dioxide adsorbent 2... Water-impermeable, air-permeable sheet 3 - Water permeable sheet 4 - Heat seal portion 5 - Carbon dioxide adsorbent 6 ・...Plate-like object...Plate-like object as a partition plate...Nonwoven fabric...Aquarium.

Claims (1)

[Claims] (1) A carbon dioxide adsorbent is sealed in a bag-like container whose entire surface is made of a sheet-like material that is air-permeable and water-impermeable. A carbon dioxide adsorbent characterized by: