JP2011051656A - Lid for generation of gas and method of dissolving the gas into water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dissolve a generated gas into water without scattering in the air when the gas is to be dissolved into the water using a gas generating agent which comes into contact with or reacts with the water to generate the gas in a short time. <P>SOLUTION: Using a lid or an inner lid for sealing a container such as a PET bottle, a gas-generating lid or an inner lid is prepared, where the gas generating agent coming into contact with the water to generate hydrogen or the like is fixed or stored in the internal space of the lid or the inner lid. After the lid or the inner lid is tightly put on the container containing the water to prevent the water and the gas generating agent from coming into contact with each other, the water is brought into contact with the gas generating agent. This method is effective for a hydrogen generating agent with rapid gas generation speed such as calcium hydrate as a hydrogen gas generating agent. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

    The present invention relates to a gas generating lid and an inner lid for dissolving carbon dioxide gas or hydrogen gas in water or an aqueous solution such as various kinds of drinking water or liquor in a container such as a PET bottle without scattering outside the container. Further, the present invention relates to a method for dissolving gas in water or an aqueous solution in a container using these lids and inner lids.

  Soft drinks in which carbon dioxide gas is dissolved in drinking water have been known for a long time. Recently, water that has dissolved hydrogen gas has begun to appear on the market because it contributes to human health. Water in which hydrogen gas is dissolved is called hydrogen water, and its production method is roughly classified into two types. One is a method in which hydrogen gas is dissolved under pressure in drinking water at a factory or the like and filled in a container (Patent Document 1). Another method is to use a hydrogen generator such as magnesium metal powder that reacts with water to generate hydrogen. The hydrogen generator is placed in a container containing water and sealed, and the generated hydrogen is dissolved in water. This is a method for adjusting hydrogen water (Patent Document 2).

  Hydrogen has the lowest molecular weight in a gas, and therefore, even if hydrogen water is adjusted and sealed in a container, there is a drawback that it is diffused during storage. Therefore, even if hydrogen water is adjusted and packed in a container at the factory, hydrogen will be scattered from the container during storage and distribution, and when it reaches the consumer, the dissolved hydrogen concentration in water (DH is abbreviated). However, there was a drawback that would be reduced. On the other hand, the method using a hydrogen generating agent can adjust the hydrogen water just before drinking the hydrogen water, so the above problems can be solved, but magnesium metal has a slow reaction with water and adjusts the hydrogen water. It takes time to do this, and there are disadvantages that unreacted metal residues remain in water.

  The present inventor recently developed a novel hydrogen generator using a hydrogen compound such as magnesium hydride (MgH 2) or calcium hydride (CaH 2) that reacts quickly with water to solve these drawbacks (Patent Literature). 3). However, since these hydrogen generators react quickly with water depending on the type and composition of the hydrogen compound, hydrogen is generated while the hydrogen generator is put into a container containing water and sealed, and the container A problem has been found that diffuses into the air from the opening.

JP 2005-177724 A JP 2007-1633 A WO2007 / 055146

  When gas is dissolved in water using a gas generating agent that reacts with water and generates gas in a short time, the generated gas is dissolved in water without being diffused in the air.

  The above problem is solved by using a lid for sealing the container, wherein the gas generating lid is fixed with a gas generating agent that generates gas in contact with water in the internal space of the lid. An inner lid of a container that is attached to the opening of the container and is covered with an outer lid of the container to be sealed, and the inner lid has an inner space surrounded by a partition wall, and the inner space The above problem is solved by using a gas generating inner lid in which a gas generating agent that generates gas in contact with water is stored.

  Preferably, by using a gas generation lid provided with a partition wall through which water and gas permeate but fine particles do not permeate on the contact surface of the gas generant and water in the lid, the reaction residue of the gas generant and water is submerged in water. It is preferable because it can be prevented from remaining on the surface. Moreover, it is preferable to use a part or all of the partition wall of the inner lid having pores through which water and gas are transmitted through the inside and outside.

  Further, in these means, when the gas generating agent is a hydrogen generating agent, the effect is more exhibited. Further, when an alkaline earth metal hydride, particularly calcium hydride, is included as a hydrogen generator, it is effective because of its intense reaction with water. In this case, it is preferable to use calcium hydride melted and embedded in a water-soluble compound because of the effect of delaying the reaction with water.

  In addition, the above-mentioned problem is a lid on which a gas generating agent is fixed, and after sealing a container containing water so that the water and the gas generating agent do not come into contact with each other, the water in the container is brought into contact with the gas generating agent to supply gas. The problem is solved by the method of generating and dissolving the gas in the water in the container. In the case of the inner lid method, the inner lid containing the gas generating agent is attached to the opening of the container containing water so that the water and the gas generating agent do not come in contact, and then the outer lid of the container is covered. This is solved by sealing the container together with the inner lid and then bringing the water in the container into contact with the gas generating agent to generate gas and dissolving the gas in the water in the container.

Also in this method, it is effective when the gas generating agent is a hydrogen generating agent, and it is preferable that the gas generating agent contains an alkaline earth metal hydride, particularly when calcium hydride is included. . Further, a state in which calcium hydride is melted and embedded in a water-soluble compound is more preferable. And as a contact method of water and a gas generating agent, after sealing a container with a lid | cover or an outer cover, the method of making a container incline or invert and contact is preferable.

  By fixing the gas generating agent that generates gas by reacting with water on the lid of the container, by sealing the container with the lid to the container containing water and then bringing the gas generating agent and water into contact with each other, The gas could be dissolved in water without being diffused into the air. In addition, by storing the gas generating agent in the inner lid by the inner lid method, the container is sealed with the outer lid after covering the inner lid, and the gas generating agent and water are brought into contact with each other. It was possible to dissolve in water without scattering.

1A and 1B are views showing a lid of the present invention, in which a) is a sectional view and b) is a plan view. c) is a cross-sectional view of the vicinity of the lid when the lid is sealed in an opening of a container such as a PET bottle. FIG. 2 shows an example of a method for dissolving gas in water using the lid of the present invention. FIG. 3 is a cross-sectional view of a lid according to another embodiment of the present invention. FIG. 4 is a view of a lid according to another embodiment of the present invention, in which a) is a sectional view, b) is a sectional view of a gas generant cartridge, and c) is a plan view thereof. FIG. 5 is a cross-sectional view of a lid according to another embodiment of the present invention. 6A) is a cross-sectional view of a lid without ribs on the inner wall portion of the lid, and FIG. 6B is a cross-sectional view of the lid processed so that a gas generating cartridge can be fixed by providing a base on the inner wall portion of the lid. FIG. 7a) is a cross-sectional view of the inner lid of the present invention. b) is a cross-sectional view of the inner lid of the present invention covered with an outer lid. c) is a cross-sectional view of a state in which an opening of a container containing water is covered with a lid composed of an inner lid and an outer lid of b) and sealed.

  The gas generating agent of the present invention reacts with or contacts with water and generates gas in a short time. As the gas, carbon dioxide gas or hydrogen gas can be considered. Typical examples of the carbon dioxide generator include a mixture of a bicarbonate such as sodium bicarbonate or sodium carbonate or a carbonate and an organic acid such as citric acid, succinic acid or oxalic acid. In addition, when water is an aqueous solution in which the above bicarbonate or carbonate is dissolved, an organic acid is a carbon dioxide generator, and if water already contains an acid such as citric acid, acetic acid or hydrochloric acid, Bicarbonate and carbonate are carbon dioxide generators.

  On the other hand, as a gas generating agent that generates hydrogen gas in a short time in contact with water, alkali metal hydrides such as lithium hydride and sodium hydride, hydrogen such as magnesium hydride (MgH2) and calcium hydride (CaH2) Examples thereof include alkaline earth metal borohydrides, metal borohydrides such as sodium borohydride and potassium borohydride. All of these hydrogen generating agents generate hydrogen by chemically reacting with water, and the reaction rate differs depending on the type of the hydrogen generating agent, but all are markedly faster than magnesium metal.

MgH2 and borohydride metal salts increase the reaction rate in the presence of acid. On the other hand, CaH2 does not require the presence of an acid and reacts with water remarkably quickly. Therefore, in order to slow down the reaction rate, it is preferably used as a hydrogen generator that is melted and embedded in a water-soluble compound such as trehalose or polyethylene glycol to slow down the reaction rate. Moreover, since CaH2 and MgH2 react with water and become alkaline, when the aqueous solution in which hydrogen is dissolved needs to be neutral, the above-mentioned organic acids and the like and these alkaline earth metal hydrides are used for the purpose of neutralization. It is necessary to mix and use the hydrogen generator or to dissolve the hydrogen generator in an aqueous solution that has been adjusted to be acidic in advance.

  The form of these gas generating agents can be fixed in the inner space of the lid of the container in various forms such as powder, tablets, and blocks, or can be stored in the inner space of the inner lid. It is easy to handle and preferable. In the case of a hydrogen generator, the hydrogen compound reacts with a small amount of moisture to generate hydrogen. For this reason, tablets are manufactured by melting and embedding the above-mentioned hydrogen compound powder in a water-soluble compound together with a solid organic acid, if necessary, and then cooling and solidifying it. It is preferable because it is a stable tablet that is difficult to receive. Whether stored in tablet form or powder form, it is necessary to store it in a humidity-free state. For example, it is preferable to store it sealed in an aluminum bag or the like.

  The lid of the present invention is attached to a container containing water at the time of use by a screw method or a mating method as a sealing lid, and then the gas generating agent fixed to the lid is turned into water and water by turning the container sideways or upside down. It has a function of generating gas upon contact. Accordingly, various forms of fixing the gas generating agent to the lid are conceivable depending on the shape of the lid. A necessary point is to make a structure in which contact between water and a gas generating agent does not occur until a container containing water is sealed with the lid of the present invention. It is preferable that the water and the gas generating agent are completely brought into contact by inclining or inverting after sealing. As a result, water is filled in the lid portion and acts as a kind of sealing agent, so that gas generated is less likely to leak to the outside. That is, the generated gas collects in the upper space portion in the container and does not collect in the lid portion.

  When a gas generating agent is attached to the inner lid and sealed with the outer lid, the sealing method may be a screw method or a mating method. In the case of the inner lid method, the gas generating agent may or may not be fixed in the inner space of the inner lid. When not fixed, it is possible to form and use the inner lid containing the gas generating agent by putting the gas generating agent in the inner space of the inner lid immediately before use, so that convenience is improved.

  Such a function that allows the generated gas to be completely dissolved in the air without letting it escape into the air can be used not only for efficiently adjusting hydrogen water or carbonated water for beverages but also in analytical techniques. For example, in the case of carbonated water shown in Example 1 described later, carbonic acid gas is generated from an organic acid such as sodium hydrogen carbonate and citric acid and dissolved in water to adjust the carbonated water. In that case, since 1 mol of carbon dioxide gas is generated from 1 mol of sodium hydrogen carbonate from the chemical reaction formula, the concentration of carbon dioxide contained in the carbonated water is theoretically determined. That is, when the carbon dioxide concentration of carbonated water in which the carbon dioxide gas generated by this reaction is completely dissolved without being released into the air is measured by the gas chromatographic method, the area of the chromatograph is equal to the theoretical carbon dioxide concentration. This leads to the creation of an accurate calibration curve required in the analysis technique.

A state in which a gas generating agent is fixed to the lid of a typical polyethylene terephthalate bottle (hereinafter abbreviated as PET bottle) will be described below with reference to the drawings. FIG. 1a) is a cross-sectional view of a lid to which a gas generating agent of the present invention is fixed, b) is a plan view thereof, and c) is a cross-sectional view of a lid portion when a container containing water is sealed with this lid. . 1 is a lid body, 3 is a threaded portion, and 4 is a rib portion. Reference numeral 5 denotes a cylindrical tablet-like gas generating agent fixed to a cylindrical space of a lid formed by ribs 4 in an engaged state. The container body 2 is a PET bottle, and the opening of the container is tightened by screwing the screw part 3 of the lid to the male screw of the opening of the container, so that it is sandwiched between the inner wall of the lid and the rib 4 and sealed in an airtight state. Is done.

  Water 11 in which gas is to be dissolved is put in the container 2 so as not to come into contact with the gas generating agent fixed to the lid, and the lid of FIG. Thereafter, as shown in FIG. 2, the entire container is turned sideways or inverted so that water and the gas generating agent come into contact with each other to generate gas. The generated gas does not escape into the air, but all the gas is confined in the container, and the gas dissolves in water according to the partial pressure of the gas.

  FIG. 3 is a cross-sectional view of a lid on which a gas generating agent according to another embodiment of the present invention is fixed. In this embodiment, a partition wall 6 that allows water and gas to permeate but does not permeate fine particles is provided on the surface of the tablet that contacts water. The partition wall 6 is disposed on the surface of the tablet 5 that comes into contact with water while being engaged with the rib 4. As a result, it is possible to prevent the reaction residue remaining after the gas generating agent comes into contact with water and generates gas from flowing out to the water side. Examples of the material of the partition wall 6 include a porous sintered body of plastic or ceramic, a nonwoven fabric of fibers, and the like.

  FIG. 4 a) is a cross-sectional view of a lid on which a gas generating agent according to another embodiment of the present invention is fixed. Reference numeral 7 denotes a pedestal provided in the cylindrical space of the rib 4 of the lid, and the tablet-like gas generating agent 5 is fixed in a cylindrical container 8 (abbreviated as cartridge) such as plastic. It is engaged with the provided hole and fixed to the lid. The pedestal 7 may be fixed to the lid, or may be separately fitted in a shape that engages with the cylindrical space of the rib 4. 4b) and 4c are a sectional view and a plan view of the cartridge. Reference numeral 9 denotes a protrusion which engages with the hole of the base 7 to fix the cartridge to the lid. Reference numeral 10 denotes a through hole provided in the side wall or the lower surface of the cartridge that comes into contact with water, through which water enters the cartridge and comes into contact with the gas generating agent to generate gas. If the water is an aqueous solution containing a solute and the viscosity is high, the aqueous solution is difficult to enter through the through-hole. In this case, it is preferable that the tablet and the aqueous solution be in direct contact with each other except for the barrier on the lower surface of the cartridge.

  FIG. 5 is a cross-sectional view of another embodiment of the present invention, and a powdered gas generating agent 5 is placed in the cartridge 8. The powdery gas generating agent may be put in a cylindrical cartridge as it is, but it is also preferable to put it in a bag made of a nonwoven fabric or the like and put it in the cartridge.

  FIG. 6 a) is a cross-sectional view of the lid without the ribs 4 described in the above drawing, which is used for some types of lids for aluminum bottles and PET bottles. This is achieved by closing the top of the container so that the upper surface of the container opening abuts against the upper inner wall surface of the lid. Usually, a lid that has a sealing function in a mating manner without using screws does not have ribs 4. In the case of such a lid, the pedestal 7 having a cartridge attachment hole is fixed to the lid, and the cartridge of FIGS. 4 and 5 can be attached to the lid to produce the lid of the present invention.

  FIG. 7a) is a cross-sectional view of an example of an inner lid containing the gas generating agent of the present invention. Reference numeral 13 denotes a main body of the inner lid, and an inner space is formed by a cylindrical partition wall 6 having a bottom surface with a flange portion at the top. A powdery or tablet-like gas generating agent 5 is accommodated in this internal space. A large number of pores through which water or gas can pass are present in part or all of the partition walls 6. In the case of a powdery gas generant, if the pore size of the partition walls is large, the powder will fall before sealing with the outer lid, so to prevent this, it is packed in a bag formed in advance with a nonwoven fabric etc. It is preferable to keep the form. b) is a cross-sectional view of the outer lid 14 combined with the inner lid containing the gas generating agent of a), and (c) is attached to the opening of a PET bottle containing water, and the container is sealed with the outer lid. It is sectional drawing of the state which carried out. A packing material 15 is used to keep the inner lid and the outer lid in close contact with the container so as to keep hermetically sealed.

  Since the gas generating agent of the present invention reacts with water to generate hydrogen or to generate carbon dioxide in the presence of water, it is necessary to store it in a dry state. Accordingly, it is preferable to store the gas generating agent on the lid and the cartridge containing the gas generating agent in an airtight state. For example, the gas generating agent is preferably sealed and packaged by deaeration in an aluminum laminate bag or the like. At the time of use, it is preferable to use the container immediately after opening the package and sealing it in a container containing water. In the case of the inner lid method, it is desirable that the inner lid containing the gas generating agent or the gas generating agent be hermetically packaged and stored in an aluminum laminate bag.

  In addition to pure water, water that can be used in the present invention can be applied to various mineral waters, natural waters, juices, shochu, liquor and all other aqueous solutions that can be used for beverages. Also included are acid and alkaline water. In addition to beverages, cosmetics such as skin lotions and cosmetic liquids can be adjusted to cosmetics that can be expected to have a whitening effect or a blood circulation promoting effect by dissolving hydrogen or carbon dioxide during use. Hereinafter, the present invention will be described in more detail with reference to examples.

  A tablet for a carbon dioxide generating agent that generates carbon dioxide upon contact with water was prepared as follows. Sodium hydrogen carbonate powder 0.84 g and anhydrous citric acid powder 1.28 g were uniformly mixed in a beaker. This mixed powder was put into a cylindrical cylinder, a piston was inserted into the cylinder, and the mixture was pressurized using a pressure press to obtain a tablet. The dimensions of the tablet were 18.2 mm in diameter and 5.3 mm in thickness. Using these tablets, a PET bottle containing 500 ml of purified water was brought into contact with water by the following two methods to generate carbon dioxide gas. The PET bottle had a space of about 25 ml at the top even when 500 ml of water was added.

Method A: Insert the tablet into the space formed by the cylindrical rib of the commercially available PET bottle lid with the rib 4 shown in FIG. 1, and fix the lid and the tablet with double-sided tape so that the tablet does not fall off from the lid. A lid with a fixed carbon dioxide generating tablet was prepared. The lid was attached to a PET bottle so as not to come into contact with water and sealed, and then the PET bottle was inverted to bring the tablet into contact with water.
Method B: The tablet was directly put into a PET bottle and immediately covered and sealed. The average time from filling the tablet to closing the lid was 5 seconds in two experiments.

  Two experiments were carried out for each of the A method and the B method, but when the tablet was in contact with water, bubbles were vigorously generated and dissolved. The average dissolution time (foaming time) of the tablets was 36 seconds for Method A and 17 seconds for Method B. Carbon dioxide concentration of carbonated water prepared by each method was analyzed by gas chromatography. As a result, the average value of the area of the chromatograph corresponding to carbon dioxide gas was 9.54 × 103 in the A method, but 9.21 × 103 in the B method. The gas concentration showed a high value. In this experiment, the method B was consciously tried to quickly close the lid, but in normal operation, it would take more than 5 seconds to seal with the lid, and the carbon dioxide concentration in the carbonated water decreased. It is thought that it will do.

  A mixture of anhydrous trehalose and adipic acid was melted on a hot plate, and sodium sulfate, magnesium sulfate and calcium hydride (CaH2) were added and mixed and stirred. The mixture was cooled and solidified to obtain a hydrogen generator in which CaH2 was melted and embedded in trehalose, which is a water-soluble compound. The solidified mixture was lightly crushed in a mortar to give a granular form. About 2.15 g of this granular material was weighed and pressed in the same manner as in Example 1 to mold a tablet-like hydrogen generator. The tablet had a diameter of 18.1 mm and a thickness of 5.9 mm. The amount of hydrogen generated from one tablet was 60 ml (24 ° C.) when hydrogen generated by reacting the tablet with water in a closed container was measured by the water gas displacement method.

  A plastic lid that was screwed into the screw in the opening of the PET bottle was created. A pressure gauge was attached to the lid so that the internal pressure of the PET bottle could be measured. In the same manner as in Example 1, 500 ml of purified water was put into a 500 ml PET bottle, and the tablets were dissolved by Method A and Method B. The foaming end time of the hydrogen generator and the internal pressure at that time were measured. However, when the tablet was fixed to the lid in order to carry out the method A, since the rib was not on the lid, the tablet was fixed to the inner wall of the lid using double-sided tape. Since the tablet contains sodium sulfate, it settled in water and foamed and dissolved even in the B method. The results are shown in Table 1.

  Experiment No. 1 and 2 are measurements on the same day, and 3 and 4 are measurements on the same day different from 1 and 2. From these results, it was found that when the hydrogen generating agent was dissolved by the A method, the internal pressure was higher without hydrogen gas being diffused into the air than by the B method.

  A tablet was fixed to the lid in the same manner as in Example 1 using the hydrogen gas generating agent prepared in Example 2. However, the non-woven fabric used for the tea pack for black tea was covered on the surface of the tablet that was in contact with water to form a partition wall. The lid on which this tablet was fixed was dissolved in 500 ml of purified water in a 500 ml PET bottle by the A method and the B method in the same manner as in Example 1 to prepare hydrogen water. The dissolved hydrogen concentration (abbreviated as DH) in the hydrogen water was measured with a portable dissolved hydrogen meter (Toa DKK Corporation). As a result, in the case of Method A: 0.87 ppm, in the case of Method B: 0.83 ppm, the Method A showed high DH. In Method B, the reaction residue of the tablet remained at the bottom of the PET bottle even after foaming was completed, and it took about 30 minutes for it to completely dissolve. However, in Method A, the reaction residue did not remain in water and was transparent. Hydrogen water was obtained.

  The inner lid and outer lid shown in FIGS. 7a) and b) made of polycarbonate resin were prepared. The cylindrical inner lid had an outer diameter of 18 mm so that it could be inserted into the opening of a commercially available PET bottle, and the height, including the flange, was 21 mm. A plurality of 0.2 mm through holes were provided in the cylindrical tube portion. Into the inner space of the inner lid, 1.00 g of powder obtained by pulverizing the hydrogen generating agent prepared in Example 2 with a pulverizer was put. Prepare a container containing 500 ml of tap water in a commercially available 500 ml PET bottle, insert the inner lid containing the hydrogen generator into the opening so that it does not come into contact with water, cover the outer lid, and seal the screwed container did. Then, the container was inverted and water and a hydrogen generating agent were contacted. At that time, it became easier for water to enter the inside of the inner lid through the through hole by manually pressing the PET bottle from the outside.

  Bubbles were generated with the dissolution of the hydrogen generator and continued for about 5 minutes. After the completion of foaming, DH of hydrogen water obtained by opening the PET bottle upright and measuring it was measured in the same manner as in Example 3. Further, after completion of the measurement of DH, an oxidation-reduction potential (abbreviated as ORP. The measuring device is an ORP meter manufactured by Toko Chemical Laboratories), and pH was measured. The measured value of ORP was converted to the standard electrode standard. As a result, DH = 0.40 ppm, ORP = −144 mv, pH = 6.28.

    For comparison, the characteristics of hydrogen water sealed in a commercially available aluminum can were measured in the same manner. As a result, DH = 0.12 ppm, ORP = −107 mV, and pH = 7.88.

  In the present invention, hydrogen water or carbonated water can be efficiently adjusted immediately before use, so that it can be expected to be useful for promoting human health as a drink or cosmetic. It is also useful as a calibration solution adjustment method for gas concentration analysis in water.

DESCRIPTION OF SYMBOLS 1 Cap body of container for sealing 2 Container body 3 Screw part of lid 4 Cylindrical rib provided inside lid 5 Gas generating agent 6 Bulkhead 7 Base 8 Gas generating agent cartridge 9 Protrusion 10 Through hole 11 Water 12 Bubble 13 Inner lid 14 Outer lid 15 Packing material

Claims (19)

  A lid for sealing a container, wherein a gas generating agent that generates gas in contact with water is fixed in an inner space of the lid.   The gas generating lid according to claim 1, wherein a partition wall through which water permeates but fine particles do not permeate is provided on the contact surface of the gas generating agent and water.   The gas generating lid according to claim 1 or 2, wherein the gas is hydrogen.   The gas generating lid according to claim 3, wherein the gas generating agent contains an alkaline earth metal hydride.   The gas generating lid according to claim 4, wherein the alkaline earth metal hydride is calcium hydride.   6. The gas generating lid according to claim 5, wherein calcium hydride is melt-embedded in a water-soluble compound. An inner lid of a container that is attached to an opening of the container and is covered with an outer lid of the container to be sealed, and the inner lid has an internal space surrounded by a partition wall. A gas generating inner lid in which a gas generating agent that generates gas upon contact with water is stored.

The inner lid for gas generation according to claim 7, wherein a part or all of the partition wall has pores through which water and gas are transmitted through the inside and outside of the partition wall.
The gas generating inner lid according to claim 7 or 8, wherein the gas is hydrogen.   The gas generating inner lid according to claim 9, wherein the gas generating agent contains an alkaline earth metal hydride.   The inner lid for gas generation according to claim 10, wherein the alkaline earth metal hydride is calcium hydride. 12. The gas generating inner lid according to claim 11, wherein calcium hydride is melt-embedded in a water-soluble compound.
  After sealing the container containing water with a lid to which the gas generating agent is fixed so that the water and the gas generating agent do not come into contact with each other, the water in the container is brought into contact with the gas generating agent to generate a gas. Gas dissolution method of dissolving gas in water.   After the inner lid containing the gas generating agent is attached to the opening of the container containing water so that the water and the gas generating agent do not come into contact with each other, the outer lid of the container is put on and the container is sealed with the inner lid A gas dissolving method in which water in a container is brought into contact with a gas generating agent to generate gas and dissolve the gas in water in the container.   The gas dissolving method according to claim 13 or 14, wherein the gas is hydrogen.   The gas dissolving method according to claim 15, wherein the gas generating agent contains an alkaline earth metal hydride.   The gas dissolving method according to claim 16, wherein the alkaline earth metal hydride is calcium hydride. The gas dissolution method according to claim 17, wherein calcium hydride is melt-embedded in a water-soluble compound.
  The gas dissolving method according to claim 13 or 14, wherein the gas generating agent and water are brought into contact with each other by inclining or inverting the container.

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