JPH03290304A - Generation of oxygen gas - Google Patents

Abstract

PURPOSE:To improve the reaction efficiency by stirring a percarbonate, a water soluble alkaline earth metal salt and an H2O2 decomposition promotion catalyst in a strongly polar solvent. CONSTITUTION:A percarbonate (e.g. sodium percarbonate), a water soluble alkaline earth metal salt (e.g. BaCl2) and an H2O2 decomposition promotion catalyst (e.g. MuO2) are put in a strongly polar solvent (e.g. water) and the resultant mixture is stirred by an agitator to generate the objective O2 gas.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is useful for preventing accidents such as fire, oxygen deficiency, generation of toxic gas, etc.
This relates to a method for generating oxygen gas that can be used for emergency medical treatment when breathing is difficult due to illness, or for oxygen supplementation to improve health before and after sports, when smoking or drinking too much alcohol, when working, studying, driving, etc. .

[Prior art and problems to be solved by the invention] Recently, sodium percarbonate (Na2Co3.
3/2H2f)□) and manganese dioxide (MnO'z)
Oxygen generators that generate oxygen by contacting suspensions or aqueous solutions of hydrogen peroxide decomposition promoting catalysts, such as A patent application has been filed.

However, sodium percarbonate is alkaline, and when oxygen is generated, this alkaline aqueous solution turns into a mist and flies into the air, so if a person inhaling oxygen at the same time inhales this mist, it is harmful. Post-processing is also an issue.

In order to prevent the mist from the alkaline aqueous solution from causing harm, Japanese Patent Laid-Open No. 62-27307 discloses a method of removing the mist by passing the oxygen generated by the reaction through a filter, but it is difficult to completely remove the mist. is extremely difficult, and also has the disadvantage that the structure of the device itself becomes complicated. Regarding the issue of post-treatment of alkaline aqueous solutions, the above-mentioned publication proposes a method in which the alkaline aqueous solution in the device is solidified into a gel-like state using a water-absorbing polymer compound and then disposed of. even if,
It is practically difficult to completely absorb an alkaline aqueous solution and prevent the liquid from leaking.

[Means for Solving the Problems] The inventors of the present invention have conducted extensive research in view of the above-mentioned circumstances, and have found that when a percarbonate and a water-soluble alkaline earth metal salt are added in a strongly polar solvent, a chemical reaction occurs. It was discovered that an insoluble alkaline earth metal carbonate, a water-soluble neutral salt, and a neutral hydrogen peroxide solution could be obtained, and the present invention was completed.

The present invention is characterized in that a percarbonate, a water-soluble alkaline earth metal salt, and a hydrogen peroxide decomposition promoting catalyst are used in a strong polar solvent and are stirred with a stirring device to generate oxygen. be.

In carrying out the present invention, an aqueous solution is generally used as the strong polar solvent.

On the other hand, examples of percarbonates include alkali metal percarbonates such as sodium percarbonate and potassium percarbonate, alkaline earth metal percarbonates such as calcium percarbonate, metal percarbonates of trivalent metals such as boron percarbonate, etc. One or more of these metal salts can be selected and used.

In addition, water-soluble alkaline earth metal salts include hydrochlorides such as calcium chloride, magnesium chloride, barium chloride, strontium chloride, calcium nitrate, magnesium nitrate,
One or more water-soluble metal salts can be selected and used from various water-soluble metal salts such as nitrates such as barium nitrate and strontium nitrate, and sulfates such as magnesium sulfate.

When using these percarbonates and water-soluble alkaline earth metal salts in the method of the present invention, it is necessary to exclude the alkaline earth metal carbonates produced in the reaction during the hydrogen peroxide generation process from the solution reaction system as insoluble substances. By doing so, the reaction system becomes a neutral hydrogen peroxide solution in which a water-soluble neutral salt is dissolved.

Furthermore, as a hydrogen peroxide decomposition catalyst, manganese dioxide, potassium permanganate, cobalt chloride, cupric salt,
One or more of commonly known catalysts such as copper oxide, ferrous complex, copper sulfide, ferricyanide salt, catalase, peroxidase, etc. can be selected and used.

When carrying out the method of the present invention, when the percarbonate reacts with the water-soluble alkaline earth metal salt, the insoluble alkali carbonate formed by the reaction is deposited on the surface of the percarbonate particles before they are dissolved in the strong polar solvent. There is a habit of adhering to the surface of percarbonate particles and making them insolubilized, and in this case, the percarbonate inside the trapped particles becomes unable to react and oxygen cannot be efficiently generated. It is also possible that the carbonate particles become agglomerated and become insolubilized as they are. Therefore, if the reaction of percarbonate, water-soluble alkaline earth metal salt, and hydrogen peroxide decomposition promoting catalyst in a strong polar solvent is carried out with stirring using a stirring device, the percarbonate particles, the strong polar solvent, and the water-soluble It has the advantage that the dissolution of the strong alkaline earth metal salt and the strong polar solvent is strongly promoted, making it difficult to form insoluble particles or agglomerates of insoluble particles, allowing the reaction to occur efficiently and increasing the amount of oxygen generated. be.

As the stirring device used in the method of the present invention, either a method that rotates a blade in the liquid or a method that utilizes the kinetic energy of the liquid may be used. The former includes things such as magnetic stirrers that are often used in laboratories, while the latter include circulation using pumps, jetting from nozzles, and static mixers.

Incidentally, it is advantageous in terms of reaction efficiency if the particle size of the percarbonate and water-soluble alkaline earth metal salt used in the method of the present invention is much smaller, since it is easier to dissolve.

Furthermore, in carrying out the method of the present invention, the procedure for introducing reagents into a strong polar solvent is to introduce a hydrogen peroxide decomposition promoting catalyst after introducing a percarbonate and a water-soluble alkaline earth metal salt into a strong polar solvent. Although the order is preferred, the order is not limited to this, and any order other than adding the percarbonate and the hydrogen peroxide decomposition promoting catalyst and then adding the water-soluble alkaline earth metal salt after a period of time is acceptable. It's okay. However, if the device uses a filter or the like to collect alkaline mist, the water-soluble alkaline earth metal salt may be added in the order after the percarbonate and hydrogen peroxide decomposition promoting catalyst are added.

[Operation of the invention] According to the method of the invention, when a percarbonate and a water-soluble alkaline earth metal salt are added in a strong polar solvent, an insoluble alkaline earth metal carbonate and a water-soluble neutral salt are formed by a chemical reaction. , a neutral hydrogen peroxide solution is obtained.

In other words, as an example of percarbonate, sodium percarbonate (Na
2Co3・3/2H20□) and barium chloride as a water-soluble alkaline earth metal salt are reacted as follows: In the reaction solution, barium carbonate, which is an insoluble alkaline earth metal carbonate, is (BaCOi ) is precipitated and excluded from the reaction solution system, and neutral hydrogen peroxide (H2O2
), and the hydrogen peroxide decomposition promoting catalyst acts on the neutral solution of hydrogen peroxide thus produced to generate oxygen.

[Effect of the invention] In short, in the method of the present invention, when oxygen is generated using percarbonate, the reaction solution becomes almost neutral, so the mist generated during oxygen generation also becomes neutral, making it safer. is high;
Furthermore, the residual liquid after oxygen generation is neutral and highly safe, and there is almost no problem even if it is disposed of as is.Furthermore, if necessary, insoluble alkaline earth metal salts in this residual liquid can be filtered, etc. It can be easily separated from the residual liquid, and post-treatment such as disposal is safe and easy.

Moreover, since this reaction is stirred, the efficiency of each reaction is good and there is an advantage that a sufficient amount of oxygen can be generated.

Next, examples of the present invention will be shown.

Pretext flow side] Using a 2Ω beaker containing water IQ, add the following Na 1
~3 experiments were attempted.

・Experiment 1 While stirring the beaker with a magnetic stirrer, 6g of B a 022.10g of Na2CO1.3
/2H20□ and 3 g of MnO□ were added at the same time, and changes over time in the pH of the solution and the amount of oxygen generated (-7 minutes, the same applies hereinafter) were measured.

・Experiment 2 As a comparative example for Experiment 1, 6 g of B a Cl 12.10 g of Na was added to the beaker without stirring.
2Co, 3/2H202, and 3g of MnO2 were added at the same time, and the pH of the solution and the amount of oxygen generated were measured over time.

・Experiment 3 While stirring the beaker with a magnetic stirrer, as a comparative example to the experiment 1, the log of Na2CO1 was added without using a water-soluble alkaline earth metal salt.
- 3/2H20□ and 2g of MnO□ were added at the same time, and the pH of the solution and the amount of oxygen generated were measured over time.

[Margin below] Table 1 shows the measurement results of Experiments 1.2.3.

As is clear from Table 1, the pH of Experiment 1 in which the present invention was carried out was clearly shifted to the neutral side at the beginning of the reaction compared to that of Experiment 2, and it was also similar to that of Experiment 3. In comparison, a shift toward the neutral side is observed throughout. In addition, regarding the amount of oxygen generated, a higher level of oxygen generation was observed from beginning to end compared to that in Experiment 2, and superior oxygen generation was observed at the beginning of the reaction compared to that of Experiment 3. It is demonstrated how effective it is in generating oxygen while keeping the solution neutral.

Furthermore, as experiment 4.5, under the same conditions as in experiment 1, 3 g of C was used instead of 6 g of BaQ22.
aα2, and that of Experiment 5 is Log of Na2CO3・
3/ Change to 2H20, 12g of 2Go, -3/2
20° of H was added, and the pH and oxygen generation amount of each solution were measured over time. The results are shown in Table 2.

As is clear from Table 2, in Experiment 4.5, smooth generation of oxygen was observed in a substantially neutral solution, and here too, the present invention was able to generate oxygen while the reaction solution was made neutral. It will be demonstrated how effective it is in this regard.

Claims (1)

[Claims] percarbonates, water-soluble alkaline earth metal salts, under strong polar solvents;
and a hydrogen peroxide decomposition promoting catalyst, and a method of generating oxygen gas by stirring with a stirring device to generate oxygen.