JP7158896B2 - Method for producing ozone gas and method for producing ozone-dissolved water - Google Patents

Description

The present invention relates to a method for producing ozone gas and a method for producing ozone-dissolved water.

Since ozone has a strong oxidizing power, it can be used for sterilization, virus inactivation, deodorization, decolorization, removal of organic substances, and the like.

As a method for generating ozone, it is known to irradiate a raw material gas containing oxygen, which is an ozone source, with ultraviolet rays and cause the oxygen in the raw material gas to absorb the ultraviolet rays, thereby causing an ozone generation reaction and generating ozone. (See Patent Documents 1 and 2, for example).

JP 2017-43513 A JP 2018-20939 A

However, it is difficult to obtain high-concentration ozone gas by the methods disclosed in Patent Documents 1 and 2. In generating ozone gas by irradiating oxygen with ultraviolet rays, it is necessary to efficiently irradiate oxygen with ultraviolet rays in order to obtain ozone gas with a high concentration.

For the purpose of sterilization, deodorization, and the like, ozone-dissolved water obtained by dissolving ozone gas in water is sometimes used. However, there is also a problem that sufficient effects such as sterilization and deodorization cannot be obtained with water in which ozone gas generated by the methods disclosed in Patent Documents 1 and 2 is dissolved. In order to obtain ozone-dissolved water with a sufficient effect, it is necessary to use a high-concentration ozone gas.

SUMMARY OF THE INVENTION Based on the above circumstances, an object of the present invention is to provide a method for producing ozone gas capable of producing ozone gas at a high concentration, and a method for producing ozone-dissolved water using the ozone gas obtained by this production method. be.

The method for producing ozone gas according to the present invention, which has been able to solve the above-mentioned problems, comprises a first step of preparing an ozone generator having a gas flow path and an ultraviolet light source; and a third step of irradiating the compressed gas with ultraviolet light from an ultraviolet light source, wherein the absolute pressure of the compressed gas in the gas flow path is 0.2 MPa or more. It is.

In the method for producing ozone gas according to the above invention, the gas is preferably air.

In the method for producing ozone gas according to the above invention, the ozone generator includes an ultraviolet light source protection tube containing a translucent material, one end of which is closed and the other end of which is open, and a non-translucent material. The ultraviolet light source is arranged inside the ultraviolet light source protection tube, the ultraviolet light source protection tube is arranged inside the tubular tube, and the ultraviolet light source protection tube and the tubular tube In the gas flow path, the compressed gas supply port is on one end side of the ultraviolet light source protection tube, and the ozone gas discharge port is on the other end side of the ultraviolet light source protection tube is preferred.

In the method for producing ozone gas according to the above invention, the ultraviolet light source has a first electrode and a second electrode, and the time required for the compressed gas to travel in the gas flow path a distance equal to the distance from the first electrode to the second electrode is , preferably 1 minute or more and 30 minutes or less.

In the method for producing ozone gas according to the invention, the ultraviolet light source is preferably a low-pressure mercury ultraviolet lamp.

In the method for producing ozone gas according to the invention, the flow rate of the compressed gas in the gas flow path is preferably 3 ml/min or more.

In the method for producing ozone gas according to the invention, the dew point of the compressed gas in the gas flow path is preferably 0 degrees or less.

In the method for producing ozone gas according to the invention, the temperature of the compressed gas in the gas flow path is preferably 5 degrees or higher.

It is preferable to produce ozone-dissolved water by bringing the ozone gas obtained by the method for producing ozone gas of the invention into contact with water.

According to the present invention, by pressurizing the oxygen-containing gas, it is possible to increase the oxygen density in the ozone generator, improve the efficiency of ultraviolet irradiation, and generate high-concentration ozone gas.

A schematic diagram of the mechanism of ozone generation is shown. 1 shows a cross-sectional view of an ozonizer according to an embodiment of the present invention; FIG. 4 shows a graph showing the results of Experimental Example 1. FIG. FIG. 10 shows a graph showing the results of Experimental Example 2. FIG. FIG. 10 shows a graph showing the results of Experimental Example 3. FIG.

By irradiating an oxygen-containing gas with ultraviolet rays, oxygen molecules (O ₂ ) are photodecomposed by the ultraviolet rays and become oxygen atoms (O). These oxygen atoms (O) combine with oxygen molecules (O ₂ ) to generate ozone (O ₃ ).

FIG. 1 shows a schematic diagram of the mechanism of ozone generation. In FIG. 1, the left side of the arrow is a schematic diagram showing the composition of the raw material gas, and the right side of the arrow is a schematic diagram showing the composition of the gas generated after irradiating the raw material gas with ultraviolet rays.

FIG. 1(a) shows ozone generation when air is used as a raw material. Air consists of a mixture of gases, about 80% nitrogen and about 20% oxygen. Therefore, FIG. 1(a) shows 16 nitrogen molecules and 4 oxygen molecules in the raw material air. When the air, which is the raw material, is irradiated with ultraviolet rays, part of the oxygen in the air becomes ozone. In FIG. 1(a), it is assumed that all oxygen molecules in the raw material are converted to oxygen atoms by ultraviolet irradiation and used for the ozone generation reaction, and two ozones are generated.

Conventionally, in order to generate high-concentration ozone gas, it was common to use high-concentration oxygen gas as a raw material. FIG. 1(b) shows the generation of ozone when high-concentration oxygen gas is used as the raw material. In FIG. 1(b), the raw material contains oxygen molecules at a higher concentration than air, and two nitrogen molecules and 18 oxygen molecules are shown in the raw material (oxygen concentration 90%). Since the number of oxygen molecules in the raw material is large, as in FIG. Ozone is produced. That is, the ozone gas is generated when the high-concentration oxygen gas shown in FIG. It can be said that ozone gas has a higher concentration of ozone.

FIG. 1(c) shows the generation of ozone when a compressed gas obtained by pressurizing air is used as a raw material. In FIG. 1(c), it is assumed that air is compressed and that the raw material contains 32 nitrogen molecules and 8 oxygen molecules, which is twice as many molecules as in FIG. 1(a). The right side of the arrow in FIG. 1(c) shows the ozone gas produced by irradiating the compressed gas with ultraviolet rays and returning the pressure to normal pressure. The composition of the ozone gas generated in FIG. 1(c) is the same as the composition of the ozone gas generated in FIG. 1(a). Therefore, even if compressed gas is used as the raw material, the ozone concentration of the generated ozone gas is thought to be the same as when the gas before pressurization is used as the raw material.

The present inventors have made various studies to solve the above-mentioned problems, and as a result, by using a compressed gas obtained by pressurizing a gas containing oxygen gas at an absolute pressure of 0.2 MPa or more as a raw material, The inventors have found that ozone gas having a higher ozone concentration than ozone gas produced using unpressurized gas can be obtained, and have completed the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the illustrated examples, and can be implemented with appropriate modifications within the scope that can conform to the gist of the above and later descriptions. All of them are included in the technical scope of the present invention.

A method for producing ozone gas according to the present invention includes a first step of preparing an ozone generator having a gas flow path and an ultraviolet light source, and a second step of circulating a compressed gas obtained by pressurizing an oxygen-containing gas through the gas flow path. and a third step of irradiating the compressed gas with ultraviolet light from an ultraviolet light source, wherein the absolute pressure of the compressed gas in the gas flow path is 0.2 MPa or more.

FIG. 2 represents a cross-sectional view along the length of the UV light source in the ozone generator of the present invention. As shown in FIG. 2, in a first step, an ozone generator 1 having a gas flow path 10 and an ultraviolet light source 11 is prepared.

Examples of the ultraviolet light source 11 include a hot cathode lamp, a low-pressure mercury ultraviolet lamp, an excimer lamp, and the like. The ultraviolet light source 11 is preferably a low-pressure mercury ultraviolet lamp among others. Since the type of the ultraviolet light source 11 is a low-pressure mercury ultraviolet lamp, it is easy to handle, and ozone gas can be produced at low cost.

The gas flow path 10 is preferably arranged around the ultraviolet light source 11 . By arranging the gas flow path 10 in this manner, the gas passing through the gas flow path 10 can be efficiently irradiated with the ultraviolet rays.

In the second step, a compressed gas obtained by pressurizing a gas containing oxygen is passed through the gas flow path 10 . In FIG. 2, the flow of gas in the gas flow path 10 is indicated by white arrows. Methods for pressurizing the oxygen-containing gas include a method of compressing by rotating a screw rotor, a method of compressing by reciprocating motion of a piston, a method of compressing by centrifugal force generated by a propeller, and the like.

In a third step, the compressed gas is irradiated with ultraviolet light by an ultraviolet light source. As described above, when a gas containing oxygen is irradiated with ultraviolet rays, oxygen molecules (O ₂ ) are decomposed and combined to generate ozone (O ₃ ).

The absolute pressure of the compressed gas inside the gas flow path 10 is 0.2 MPa or higher. By setting the absolute pressure of the compressed gas to 0.2 MPa or higher, it is possible to generate ozone gas with a higher ozone concentration than when gas at atmospheric pressure is used.

The absolute pressure of the compressed gas in the gas channel 10 may be 0.2 MPa or higher, preferably 0.3 MPa or higher, more preferably 0.4 MPa or higher, and 0.5 MPa or higher. is more preferable, and 0.6 MPa or more is particularly preferable. By setting the lower limit of the absolute pressure of the compressed gas in this way, the ozone concentration of the generated ozone gas can be further increased. Although the upper limit of the absolute pressure of the compressed gas is not particularly limited, it can be, for example, 10 MPa or less, 8 MPa or less, or 5 MPa or less.

Preferably, the gas is air. That is, in ozone gas production, the oxygen-containing gas used as a raw material is air, and it is preferable to produce ozone gas using compressed air. By using air as the oxygen-containing gas, the raw material gas for ozone gas can be easily handled, and the cost for producing ozone gas can be reduced.

As shown in FIG. 2, the ozone generator 1 includes a translucent material, an ultraviolet light source protection tube 12 closed at one end and open at the other end, and a non-translucent material. It is preferred to have a tubular tube 13 containing. By configuring the ozone generator 1 in this manner, the compressed gas in the gas flow path 10 can be efficiently irradiated with ultraviolet rays, and the production efficiency of ozone gas can be increased.

The ultraviolet light source 11 is arranged inside the ultraviolet light source protective tube 12 , and the ultraviolet light source protective tube 12 is arranged inside the cylindrical tube 13 , and between the ultraviolet light source protective tube 12 and the cylindrical tube 13 . It is preferable to have the gas flow path 10 in the . By configuring the ozone generator 1 in this manner, the gas flow path 10 and the ultraviolet light source 11 can be separated from each other, and the temperature of the ultraviolet light source 11 can be reduced when the ultraviolet light source 11 is operated for a long time. rise and the generated ozone can be prevented from being decomposed.

Examples of translucent materials included in the material forming the ultraviolet light source protective tube 12 include synthetic quartz and natural quartz. The translucent material is preferably synthetic quartz, among others. Since the ultraviolet light source protective tube 12 contains synthetic quartz, the ultraviolet light emitted from the ultraviolet light source 11 is hardly absorbed by the ultraviolet light source protective tube 12, and the irradiated ultraviolet light can be efficiently used for producing ozone gas.

Examples of the non-translucent material included in the material forming the tubular tube 13 include metals such as stainless steel and ceramics. Among others, the non-translucent material is preferably a metal. Since the cylindrical tube 13 contains metal, the strength of the cylindrical tube 13 can be increased, and the absolute pressure of the compressed gas can be further increased.

In the gas flow path 10 , the compressed gas supply port 14 is preferably located on one end side of the ultraviolet light source protection tube 12 , and the ozone gas discharge port 15 is preferably located on the other end side of the ultraviolet light source protection tube 12 . That is, it is preferable that the compressed gas supply port 14 is provided on the side where the end of the ultraviolet light source protection tube 12 is closed, and the ozone gas discharge port 15 is provided on the side where the end of the ultraviolet light source protection tube 12 is open. By configuring the gas flow path 10 in this way, it becomes easier to increase the ozone concentration of the generated ozone gas.

As shown in FIG. 2, the compressed gas supply port 14 is arranged on one side of the tubular tube 13 with the ultraviolet light source 11 as a boundary, and the ozone gas outlet 15 is arranged on the other side of the tubular tube 13 . preferable. In FIG. 2 , with the ultraviolet light source 11 as a boundary, a compressed gas supply port 14 is provided on the left side of the paper, which is one side of the cylindrical tube 13 , and an ozone gas discharge port 15 is provided on the other side, the right side of the paper, of the cylindrical tube 13 . It is By providing the compressed gas supply port 14 and the ozone gas discharge port 15 at such positions, the compressed gas supply port 14 and the ozone gas discharge port 15 can be separated from each other in the gas flow path 10, and the ozone gas can be discharged. Ozone concentration can be increased.

The ultraviolet light source 11 preferably has a first electrode 11a and a second electrode 11b. For example, when the ultraviolet light source 11 is a low-pressure mercury ultraviolet lamp, the ultraviolet light source 11 can generate ultraviolet light by discharging between the first electrode 11a and the second electrode 11b. That is, it can be said that the distance L1 from the first electrode 11a to the second electrode 11b is the effective emission length of the ultraviolet light source 11 .

The shape of the ultraviolet light source 11 may be a linear shape or a bent shape such as a U shape. In addition, when the shape of the ultraviolet light source 11 is a bent shape, the effective emission length of the ultraviolet light source 11 is the distance between the first electrode 11a or the second electrode 11b and the bent portion of the ultraviolet light source 11 .

The time the compressed gas travels in the gas flow path 10 for a distance equal to the distance L1 from the first electrode 11a to the second electrode 11b is preferably 1 minute or longer, more preferably 1.5 minutes or longer, More preferably, it is 2 minutes or longer. By setting the lower limit of the time for the compressed gas to travel the distance equal to the distance L1 from the first electrode 11a to the second electrode 11b in the gas flow path 10 in this way, the ultraviolet light emitted from the ultraviolet light source 11 can be applied to the gas flow. Enough contact with the compressed gas in the passageway 10 can be made to increase the concentration of ozone. In addition, the time the compressed gas travels in the gas flow path 10 for a distance equal to the distance L1 from the first electrode 11a to the second electrode 11b is preferably 30 minutes or less, more preferably 25 minutes or less. More preferably, it is 20 minutes or less. Ozone is generated by irradiating oxygen with ultraviolet rays, but ozone may be decomposed and returned to oxygen by irradiating ozone with ultraviolet rays. By setting the upper limit of the time that the compressed gas travels in the gas flow path 10 for a distance equal to the distance L1 from the first electrode 11a to the second electrode 11b, the generated ozone is decomposed, and the ozone of the ozone gas is decomposed. It is possible to prevent the concentration from decreasing.

In addition, when the shape of the ultraviolet light source 11 is a bent shape, the time required for the compressed gas to reach the first electrode 11a or the second electrode 11b from the bent portion of the ultraviolet light source 11, or the time required for the compressed gas to reach the first electrode 11a or The time from the second electrode 11b to reach the bent portion of the ultraviolet light source 11 is preferably 1 minute or longer, more preferably 1.5 minutes or longer, and further preferably 2 minutes or longer. , preferably 30 minutes or less, more preferably 25 minutes or less, even more preferably 20 minutes or less.

It is preferable that the light emitted from the ultraviolet light source 11 has a peak wavelength between 100 nm and 230 nm. Of the ultraviolet rays emitted by the ultraviolet light source 11, the ultraviolet rays with a wavelength of 185 nm are said to contribute to the generation of ozone, and the ultraviolet rays with a wavelength of 254 nm are said to act on the decomposition of ozone. Therefore, the light emitted by the ultraviolet light source 11 preferably has a peak wavelength of 100 nm or more and 230 nm or less, more preferably 120 nm or more and 210 nm or less, and a peak wavelength of 150 nm or more and 200 nm or less. is more preferred. Since the light emitted by the ultraviolet light source 11 is thus arranged, the oxygen in the compressed gas easily reacts with the ultraviolet rays emitted by the ultraviolet light source 11, and the ozone gas can be produced efficiently.

The flow rate of the compressed gas in gas flow path 10 is preferably 3 ml/min or more, more preferably 10 ml/min or more, and even more preferably 50 ml/min or more. By setting the lower limit of the flow rate of the compressed gas in the gas passage 10 in this manner, ozone gas can be produced efficiently. Also, the flow rate of the compressed gas in the gas passage 10 is preferably 3000 ml/min or less, more preferably 2800 ml/min or less, and even more preferably 2500 ml/min or less. By setting the upper limit of the flow rate of the compressed gas in the gas passage 10 in this way, the compressed gas in the gas passage 10 can be sufficiently irradiated with ultraviolet rays, and the concentration of ozone can be increased.

The dew point of the compressed gas in the gas passage 10 is preferably 0 degrees or less, more preferably -5 degrees or less, and even more preferably -10 degrees or less. By setting the upper limit of the dew point of the compressed gas in the gas passage 10 in this way, the produced ozone is less likely to be decomposed into oxygen molecules, and the concentration of ozone can be easily maintained in a high state. Although the lower limit of the dew point of the compressed gas in the gas flow path 10 is not particularly limited, it can be -70 degrees or more, -60 degrees or more, or -50 degrees or more, for example.

The temperature of the compressed gas in the gas passage 10 is preferably 5 degrees or higher, more preferably 7 degrees or higher, and even more preferably 9 degrees or higher. By setting the lower limit of the temperature of the compressed gas in the gas passage 10 in this manner, the reactivity between oxygen molecules and ultraviolet rays can be enhanced, making it easier to generate ozone. Also, the temperature of the compressed gas in the gas passage 10 is preferably 60 degrees or less, more preferably 50 degrees or less, and even more preferably 40 degrees or less. By setting the upper limit of the temperature of the compressed gas in the gas flow path 10 in this way, it is possible to make it difficult for the generated ozone to return to oxygen molecules, making it easier to increase the concentration of ozone.

It is also preferable to produce ozone-dissolved water by bringing the ozone gas generated by the present invention into contact with water. Ozone-dissolved water using ozone gas produced by the present invention has high ozone concentration, so it has high effects such as sterilization and deodorization.

Hereinafter, the effects of the present invention will be shown more specifically by way of examples. The following examples are not intended to limit the scope of the present invention, and any modifications along the spirit of the above and the following are included in the technical scope of the present invention.

(Experimental example 1)
In Experimental Example 1, the relationship between the ultraviolet ray reaction time and the ozone concentration of the ozone gas was confirmed for each absolute pressure of the compressed gas in the gas passage 10 . The ultraviolet reaction time is the time required for the compressed gas in the gas flow path 10 to travel the effective emission length of the ultraviolet light source 11, that is, the distance equal to the distance L1 from the first electrode 11a to the second electrode 11b. It represents the time traveled by the compressed gas in path 10 . A low-pressure mercury UV lamp (SEC403D11, 40 W, manufactured by Sun Energy Co., Ltd.) was used as the UV light source 11 . A synthetic quartz tube with an outer diameter of 29 mm was used for the ultraviolet light source protection tube 12 . A stainless steel tube having an inner diameter of 59.5 mm and an outer diameter of 63.5 mm was used for the tubular tube 13 .

The absolute pressure of the compressed gas in the gas passage 10 was adjusted to various conditions, the ultraviolet light was irradiated from the ultraviolet light source 11, and the ozone concentration of the obtained ozone gas was measured. The ozone concentration was measured using an ozone detector tube. Specifically, the produced ozone gas is sampled by connecting a bag or container to the ozone gas discharge port 15 of the ozone generator 1, one end of an ozone detection tube is inserted into the bag or container, and the other end of the ozone detection tube is inserted. The ozone concentration can be measured by connecting an aspirator to the end and allowing ozone gas to pass through the ozone detection tube.

The results of Experimental Example 1 are shown in Table 1 and FIG. The gas flow rate is a measured value at 0° C. and atmospheric pressure. From the results of Experimental Example 1, when the absolute pressure of the compressed gas in the gas flow path 10 is 0.2 MPa or more, ozone gas with a higher ozone concentration than when using a gas with an absolute pressure of less than 0.2 MPa is produced. I am able to get it.

(Experimental example 2)
In Experimental Example 2, the difference in the ozone concentration of the ozone gas produced when the material forming the ultraviolet light source protection tube 12 is synthetic quartz and when the material is natural quartz was confirmed. In Experimental Example 2-1, a synthetic quartz ultraviolet light source protective tube 12 was used, and in Experimental Example 2-2, a natural quartz ultraviolet light source protective tube 12 was used.

The same operation as in Experimental Example 1 was performed, and the ozone concentration of the ozone gas obtained when the ultraviolet irradiation time was changed between Experimental Examples 2-1 and 2-2, and the flow rate of the compressed gas was changed. The ozone concentration of the obtained ozone gas was measured. The absolute pressure of the compressed gas inside the gas flow path 10 was set to 0.5 MPa.

Table 2 shows the results of Experimental Example 2-1, and Table 3 shows the results of Experimental Example 2-2. Moreover, the result of Experimental example 2 is shown in FIG. The gas flow rate is measured at each gas temperature at atmospheric pressure. From the results of Experimental Example 2, the ozone concentration of the ozone gas was higher when the ultraviolet light source protection tube 12 made of synthetic quartz was used than when the ultraviolet light source protection tube 12 made of natural quartz was used. This is because synthetic quartz has a transmittance of 90% for ultraviolet rays at 185 nm, whereas natural quartz contains trace amounts of heavy metals, so the transmittance for ultraviolet rays at 185 nm is as low as 65%. It is considered that the light source protective tube 12 absorbed the ultraviolet rays, and the ultraviolet rays were not sufficiently used for ozone generation.

(Experimental example 3)
In Experimental Example 3, the relationship between the dew point of the compressed gas in the gas passage 10 and the ozone concentration of the ozone gas was confirmed.

The same operation as in Experimental Example 1 was performed, the dew point of the compressed gas in the gas passage 10 was adjusted to various conditions, and the ozone concentration of the obtained ozone gas was measured. The ultraviolet irradiation time was 10.2 minutes, and the absolute pressure of the compressed gas in the gas passage 10 was 0.5 MPa.

The results of Experimental Example 3 are shown in Table 4 and FIG. From the results of Experimental Example 3, the lower the dew point of the compressed gas in the gas passage 10, the higher the ozone concentration of the generated ozone gas. The reason for this is thought to be that when the amount of moisture in the compressed gas is large, the water contained in the compressed gas reacts with the produced ozone, and the ozone returns to oxygen molecules.

As described above, the method for producing ozone gas according to the present invention includes the first step of preparing an ozone generator having a gas flow path and an ultraviolet light source, and circulating a compressed gas obtained by pressurizing an oxygen-containing gas through the gas flow path. The method includes a second step and a third step of irradiating the compressed gas with ultraviolet light from an ultraviolet light source, wherein the absolute pressure of the compressed gas in the gas flow path is 0.2 MPa or more. By using such a manufacturing method, it is possible to increase the oxygen density in the ozone generator, increase the efficiency of ultraviolet irradiation, and generate ozone gas with a high concentration.

1: Ozone generator 10: Gas flow path 11: Ultraviolet light source 11a: First electrode 11b: Second electrode 12: Ultraviolet light source protection tube 13: Cylindrical tube 14: Compressed gas supply port 15: Ozone gas discharge port L1: First electrode to the second electrode

Claims (8)

a first step of providing an ozone generator having a gas flow path and an ultraviolet light source;
a second step of circulating a compressed gas obtained by pressurizing a gas containing oxygen through the gas flow path;
a third step of irradiating the compressed gas with ultraviolet light by the ultraviolet light source;
The method for producing ozone gas, wherein the absolute pressure of the compressed gas in the gas flow path is 0.2 MPa or more,
The ozone generator includes a UV light source protection tube containing a translucent material, one end of which is closed and the other end of which is open, and a cylindrical tube containing a non-translucent material. ,
The ultraviolet light source is arranged inside the ultraviolet light source protection tube,
The ultraviolet light source protection tube is arranged inside the cylindrical tube,
The gas flow path is provided between the ultraviolet light source protection tube and the tubular tube ,
The method for producing ozone gas , wherein the ultraviolet light source is a low-pressure mercury ultraviolet lamp . The method for producing ozone gas according to claim 1, wherein the gas is air. 3. The gas flow path according to claim 1, wherein the compressed gas supply port is located on the one end side of the ultraviolet light source protection tube, and the ozone gas discharge port is located on the other end side of the ultraviolet light source protection tube. A method for producing ozone gas as described. The ultraviolet light source has a first electrode and a second electrode,
4. The method according to any one of claims 1 to 3, wherein the time for which the compressed gas travels in the gas passage for a distance equal to the distance from the first electrode to the second electrode is 1 minute or more and 30 minutes or less. A method for producing ozone gas. The method for producing ozone gas according to any one of claims 1 to 4 , wherein a flow rate of said compressed gas in said gas flow path is 3 ml/min or more. The method for producing ozone gas according to any one of claims 1 to 5 , wherein the dew point of the compressed gas in the gas flow path is 0 degrees or less. The method for producing ozone gas according to any one of claims 1 to 6 , wherein the temperature of the compressed gas in the gas channel is 5 degrees or higher. A method for producing ozone-dissolved water, comprising bringing ozone gas obtained by the production method according to any one of claims 1 to 7 into contact with water to produce ozone-dissolved water.

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