KR101696649B1 - Apparatus for generrating pure chlorine dioxide and method - Google Patents

Abstract

The present invention relates to a chlorine dioxide generator which generates chlorine dioxide by having a reaction between sodium chlorite and hydrochloric acid. More particularly, the pure chlorine dioxide generator generates pure chlorine dioxide gas by activating an aqueous chlorine dioxide solution by having a reaction between sodium chlorite and hydrochloric acid, and deaerating chlorine oxide gas only from the aqueous chlorine dioxide solution by injecting compressed air to the activated chlorine dioxide solution.

Description

[0001] APPARATUS FOR GENERATING PURE CHLORINE DIOXIDE AND METHOD [0002]

The present invention relates to a chlorine dioxide generating apparatus for generating chlorine dioxide by reacting sodium chlorite with hydrochloric acid. More particularly, the present invention relates to an apparatus for generating chlorine dioxide by reacting sodium chlorite with hydrochloric acid to activate chlorine dioxide aqueous solution, And pure chlorine dioxide gas is generated by degassing only chlorine dioxide gas from an aqueous solution of chlorine dioxide, and a method thereof.

As the work environment and living environment of people become more and more closed in today's space, interest and necessity for removing various harmful substances, sterilization and deodorization are continuously increasing. Chlorine dioxide (ClO2) has been attracting attention as a new chemical replacing the existing chlorine (Cl2) oxidizing agent, which shows an excellent effect in air disinfection and deodorization.

Generally, chlorine dioxide is widely used in various fields such as removal of toxic minerals, removal of heavy metals, sterilization and disinfection, bleaching of garments, removal of bad smell, etc. It does not oxidize organic matters and maintains germicidal efficacy in a wide pH range, And its commercial value and industrial significance are very high due to its environmentally friendly characteristics. However, chlorine dioxide has excellent disinfecting power, deodorizing power, and harmlessness to the human body. However, chlorine dioxide has a high explosibility when exposed to a certain concentration in the air, which makes it difficult to transport or store for a long period of time.

Therefore, it is difficult to store in a large quantity by compression, and it is hard to store because of a large change in state over time when exposed to an external environment at room temperature, and it is not easy to prepare and analyze for generation. A high generation method is necessary.

Conventionally, a large-scale generation method using chlorate and a reducing agent (SO2, HCl, CH3OH, etc.) is used, but a large-scale facility is required according to a mass generation method, .

In the case of a small amount generation system designed to solve the above problems, a method of producing chlorine dioxide by oxidizing inorganic acid and salt chlorite is used. The chlorine dioxide generated through this process is low in purity and impurities There is a problem in that the yield is low.

In addition, there is a generation method using chlorite, hydrochloric acid and hypochlorite. However, in this case, since three or more raw materials are used, the reaction is complicated and the storage and handling of raw materials are not easy.

As described above, chlorine dioxide is a highly utilizable material due to its variety of uses and environmental safety. However, since the chlorine dioxide is unstable at room temperature, the production method is difficult and the transportation and distribution are restricted. Therefore, A new generation method capable of solving the same problem is required.

(0001) Korean Patent No. 10-0445756 (Registered Date: Aug. 16, 2004)

SUMMARY OF THE INVENTION It is a primary object of the present invention to provide a chlorine dioxide aqueous solution by using an activated chlorine dioxide aqueous solution by using a reaction between sodium chlorite and hydrochloric acid and dechlorinating the chlorine dioxide gas from the chlorine dioxide aqueous solution, The present invention provides a chlorine dioxide generating device capable of continuously generating chlorine dioxide gas that has been subjected to a process other than the impurities contained in the chlorine dioxide generating device.

It is another object of the present invention to provide a safe chlorine dioxide generator which does not store generated chlorine dioxide and uses the chlorine dioxide immediately after its occurrence, thereby avoiding the risk of explosion.

Another object of the present invention is to provide a chlorine dioxide generating apparatus which is easy to control, minimizes site space, and provides a low-cost and small-sized chlorine dioxide generating apparatus because it does not store and store generated chlorine dioxide.

It is another object of the present invention to provide an apparatus for generating chlorine dioxide which does not generate an unknown compound due to the reaction of an oxidizing agent as well as high stability against impurities except for oxidation because pure chlorine dioxide is used.

Further, since the chlorine dioxide generated through the reaction is recovered in a gaseous state, it is possible to obtain a chlorine dioxide having high purity, thereby providing an environmentally friendly chlorine dioxide generating device that not only has a high yield, but also produces environmentally safe reactants. .

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular embodiments that are described. It can be understood.

As means for solving the technical problem of the present invention,

A pure chlorine dioxide generator according to an embodiment of the present invention includes:

A storage tank for storing sodium chlorite and hydrochloric acid separately;

A reaction tank for producing an aqueous solution of chlorine dioxide by reacting sodium chlorite supplied from the storage tank with hydrochloric acid;

And a deaeration tank for purifying the chlorine dioxide gas to generate pure chlorine dioxide gas by injecting compressed air into the activated chlorine dioxide aqueous solution in the reaction tank,

The degassing vessel includes:

A tank having a constant inner space;

A gas outlet provided at an upper end of the tank for discharging the generated pure chlorine dioxide gas to the outside;

A contact material layer formed by filling a plurality of contact materials in the tank;

An aqueous solution injection tube for supplying an aqueous solution of chlorine dioxide to the upper portion of the contact material layer;

A compressed air inlet tube for supplying compressed air to a lower portion of the contact material layer;

And a filtrate outlet provided at the lower end of the tank for discharging the filtrate from which the chlorine dioxide gas has been degassed to the outside.

In the present invention, the contact material layer is divided into several layers by separately filling contact materials having different diameters.

The contact material layer is divided into an upper layer, an intermediate layer, and a lower layer, and the diameter of the contact material increases toward the lower portion.

The upper layer is filled with a contact material having a diameter of 2 mm or less, the intermediate layer is filled with a contact material having a diameter of about 5 mm, and the lower layer is filled with a contact material having a thickness of about 10 mm.

A compressed air supply pipe for supplying compressed air is connected to the compressed air injection pipe, and the compressed air supply pipe is provided with a compressed air generator for generating compressed air and a compressed air control valve for regulating the supply amount of the compressed air supplied to the tank An aqueous solution supply pipe connected to the reaction tank and supplying an aqueous solution of chlorine dioxide is connected to the aqueous solution injection pipe and an aqueous solution control valve for adjusting the supply amount of the aqueous solution supplied to the tank is installed in the aqueous solution supply pipe, The filtrate discharge port is provided with a filtrate discharge pipe for discharging the filtrate moved to the lower part of the tank. The filtrate discharge pipe controls the discharge amount of the filtrate discharged from the tank, and the compressed air inside the tank is discharged to the outside The filtrate control valve is installed to control the leakage The.

The pure chlorine dioxide generating method according to the present invention is characterized in that in the aforementioned pure chlorine dioxide generating apparatus,

A raw material storage and supply step of storing sodium chlorite and hydrochloric acid in the storage tank and supplying the stored sodium chlorite and hydrochloric acid to the reaction tank;

A raw material reaction step of mixing sodium chlorate and hydrochloric acid supplied from the storage tank to produce an aqueous solution of chlorine dioxide;

Supplying a chlorine dioxide aqueous solution activated in the reaction tank to an upper portion of the contact material layer of the degassing tank;

And a chlorine dioxide gas generating step of supplying compressed air to the chlorine dioxide aqueous solution supplied to the deaeration tank to remove pure chlorine dioxide gas from the chlorine dioxide aqueous solution to generate chlorine dioxide gas,

Wherein the chlorine dioxide gas generating step comprises:

The aqueous chlorine dioxide solution injected into the upper portion of the contact material layer passes through the contact material layer and flows downward. The compressed gas injected into the lower portion of the contact material layer moves upward through the contact material layer, The chlorine dioxide gas contained in the aqueous solution of chlorine dioxide is deaerated by contacting with the aqueous solution of chlorine to produce pure chlorine dioxide gas.

In the present invention, the chlorine dioxide gas generated in the chlorine dioxide gas generating step may be adjusted by adjusting the supply amount of the chlorine dioxide aqueous solution supplied to the upper part of the tank, the supply amount of the compressed air supplied to the lower part of the tank, The amount of pure chlorine dioxide gas is controlled by adjusting the amount of the filtrate discharged through the filtrate outlet.

The chlorine dioxide gas generated in the chlorine dioxide gas generating step measures the concentration of chlorine dioxide gas passing through the gas outlet and adjusts the supply amount of the chlorine dioxide aqueous solution supplied to the upper portion of the tank from a separate control unit , The production amount of pure chlorine dioxide gas is regulated by regulating the supply amount of compressed air supplied to the lower part of the tank or controlling the amount of the filtrate discharged through the filtrate discharge port.

The contact material layer is divided into several layers, contact materials of different diameters are filled in each layer, the contact time of the aqueous solution of chlorine dioxide and the compressed gas is sufficiently increased, and the flow of the chlorine dioxide aqueous solution and the compressed air is made smooth, Increase production efficiency.

The apparatus for generating chlorine dioxide using sodium chlorite and hydrochloric acid according to the present invention having the above-described configuration has the following effects.

 First, in generating chlorine dioxide, it is possible to generate pure chlorine dioxide, there is no limitation in use due to previous impurities, there is no danger of storing chlorine dioxide aqueous solution, and no separate storage space is required. Can be reduced.

In addition, the gaseous chlorine dioxide can reduce the contact time because its reactivity is faster than when it is in the aqueous solution state, and it may be used at a lower concentration than in the aqueous solution state. This is advantageous in that it is possible to operate at a higher efficiency than the conventional generating apparatus, drastically reduce the maintenance cost, and take a safe generation system that generates instantaneously and there is no risk of explosion.

In addition, it is not necessary to store and store, and a separate apparatus is not required, so that it is possible to provide a generation facility which is very simple in control, low in cost, and small in size.

Furthermore, since the produced chlorine dioxide is used in a gaseous state, the purity is high and the yield is high, and the reactant generated at this time is also environmentally very safe.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a configuration diagram of a pure chlorine dioxide generating device according to the present invention,
2 is an enlarged view of the degassing vessel showing the structure of the contact material layer according to the present invention,
3 is a flow chart illustrating a method for generating pure chlorine dioxide according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a pure chlorine dioxide generating apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a chlorine dioxide generating apparatus according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a degassing vessel according to the present invention.

As shown, the pure chlorine dioxide generating apparatus 1 of the present invention comprises a storage tank 2 for storing at least two types of raw materials; A reaction tank 3 for mixing raw materials supplied from the storage tank 2 to produce an aqueous solution of chlorine dioxide; And a deaeration tank (4) for injecting compressed air into the activated chlorine dioxide aqueous solution activated in the reaction tank (3) to generate chlorine dioxide gas.

Particularly, the present invention is characterized in that a chlorine dioxide aqueous solution activated in the reaction tank 3 is supplied to the degassing tank 4, compressed air is injected into the lower portion of the degassing tank 4, The chlorine dioxide gas is deaerated to produce pure chlorine dioxide gas.

Thus, chlorine dioxide gas generated by deaeration in an aqueous solution of chlorine dioxide is pure chlorine dioxide that does not contain impurities, and there is no limitation in its use due to impurities, and there is a risk that the chlorine dioxide aqueous solution must be stored by directly producing chlorine dioxide in a gaseous state And there is no need for a separate storage space, so that the installation area can be reduced.

More specifically, the degassing vessel 4 includes a tank 41 having an internal space of a predetermined size. The tank 41 has a gas discharge port 42 for discharging deaerated chlorine dioxide gas to the outside. In addition, at the lower end of the tank 41, a filtrate discharge port 43 for discharging the remaining filtrate by degassing the chlorine dioxide gas is formed.

In addition, a contact material layer 45 composed of a plurality of contact materials 44 is formed in the tank 41.

An upper portion of the contact material layer 45 is provided with an aqueous solution injection pipe 46 for horizontally supplying an activated chlorine dioxide aqueous solution in the reaction tank 3. A compressed air injection pipe 47 for supplying compressed air to the contact material layer 45 is installed horizontally below the contact material layer 45.

A compressed air supply pipe 57 for supplying predetermined compressed air is connected to the compressed air injection pipe 47. A compressed air generator 67 for generating compressed air is connected to the compressed air supply pipe 57, And a compressed air control valve 77 for controlling the supply amount of the compressed air supplied into the tank 41.

The aqueous solution injection pipe 46 is provided with an aqueous solution supply pipe 56 for supplying an aqueous solution of chlorine dioxide from the reaction tank 3 and an aqueous solution of chlorine dioxide And an aqueous solution control valve 76 for adjusting the supply amount of the water.

The filtrate outlet pipe 43 is connected to a filtrate outlet pipe 53 for discharging the filtrate to the outside and the outlet of the filtrate outlet pipe 53 is controlled to adjust the amount of the filtrate discharged from the tank 41, And a filtrate control valve 73 for preventing the compressed air in the tank 41 from leaking to the outside.

A gas discharge pipe 52 for discharging chlorine dioxide gas is connected to the gas discharge port 42. The gas discharge pipe 52 is connected to the gas discharge port 42 for controlling the discharge amount of chlorine dioxide gas discharged from the tank 41 A gas control valve 72 is provided. A nozzle 54 may be provided at the tip of the gas discharge pipe 52 and a sensor 9 for measuring the concentration of chlorine dioxide gas may be provided at one side of the gas discharge pipe 52. The sensor (9) is electrically connected to the control unit (5).

Accordingly, when the chlorine dioxide aqueous solution is supplied to the upper portion of the contact material layer 45 through the aqueous solution injection pipe 46, the supplied chlorine dioxide aqueous solution passes through the contact material layer 45 while flowing downward by gravity. Conversely, the compressed air injected into the lower portion of the contact material layer 45 through the compressed air injection pipe 47 moves upward, passes through the contact material layer 45, and is discharged to the outside through the gas discharge port 42 do. Thus, the aqueous solution of chlorine dioxide and the compressed air passing through the contact material layer 45 come into contact with each other to degas the chlorine dioxide gas from the chlorine dioxide aqueous solution.

Thus, the deaerated chlorine dioxide gas moves upward together with the compressed air and is discharged to the outside through the gas outlet (52). The nozzle 54 injects chlorine dioxide gas to be used for various purposes such as sterilization, disinfection, odor removal, and the like. On the other hand, the chlorine dioxide gas is deaerated and the remaining filtrate is moved downward by gravity and then discharged to the outside through the filtrate discharge port 43 provided at the lower end of the tank 41.

On the other hand, the contact material layer 45 provided in the center of the tank 41 sufficiently increases the contact time between the downwardly flowing aqueous chlorine dioxide solution and the upwardly flowing compressed gas, thereby facilitating the deaeration of the chlorine dioxide gas . That is, as the surface area of the contact layer 45 becomes wider, the chlorine dioxide gas can be smoothly removed. At this time, the contact member 44 may be formed of various types of fillings such as spherical, rhombic, polygonal, and the like. Further, the diameter of the contact member 44 is 5 mm and 10 mm from 2 mm. As described above, the contact material 44 has an effect of extending the residence time of the chlorine dioxide aqueous solution and the compressed air to increase the degassing efficiency and reduce the size of the degassing vessel 4.

However, when the diameter of the contact member 44 is too small to allow the air gap to be narrow, the flow of the aqueous solution of chlorine dioxide and the flow of compressed air are blocked . Therefore, the contact material layer 45 according to the present invention is divided into an upper layer 451, an intermediate layer 452 and a lower layer, and the contact material having a larger size from the upper portion to the lower portion is filled. For example, a contact material 44 having a diameter of 2 mm or less is filled in the upper layer 451, a contact material 44 having a diameter of about 5 mm is filled in the intermediate layer 452, and a contact material having a diameter of about 10 mm is filled in the lower layer 453 It is filled. At this time, the upper layer 451, the intermediate layer 452, and the lower layer 453 may have the same height, or one or two layers may be formed higher than the other layers. As described above, the contact material layer 45 is divided into several layers, and the contact material 44 having a larger diameter is charged from the upper part to the lower part, so that the flow of the aqueous solution of chlorine dioxide and the compressed air can be smoothly Thereby maximizing the degassing efficiency.

On the other hand, the amount of chlorine dioxide gas generated through the gas outlet 42 is controlled by adjusting the supply amount of the chlorine dioxide aqueous solution supplied to the upper portion of the contact material layer 45, The amount of compressed air can be adjusted to easily control the amount of the compressed air supplied. Also, the amount of chlorine dioxide gas generated can be controlled by adjusting the level of the aqueous solution of chlorine dioxide in the tank 41 by adjusting the amount of the filtrate discharged through the filtrate discharge port 43.

As described above, according to the present invention, the contact material layer 45 having a large surface area can be provided inside the tank 41 to improve the degassing efficiency. Therefore, it is possible to provide a safe generation system which can operate at a higher efficiency than the conventional generator, significantly reduce the maintenance cost, and instantly generate and use the system without the risk of explosion.

Next, a method of generating pure chlorine dioxide according to the present invention will be described.

3 is a flow chart showing a chlorine dioxide generating method according to the present invention. As shown in the figure, the pure chlorine dioxide generating method of the present invention includes a raw material storing and supplying step (S10), a raw material reacting step (S20), an aqueous chlorine dioxide supplying step (S30), and a chlorine dioxide gas degassing step (S40) .

First, the raw material storage and supply step (S10) is a step of separating and storing sodium chlorite and hydrochloric acid, and then supplying the separated raw material to one reaction vessel (3). At this time, a raw material supply pipe is connected between the sodium hypochlorite and hydrochloric acid storage tank 2 and the reaction tank 3, and the raw material supply pipe is provided with a raw material for controlling the supply amount of sodium chlorite and hydrochloric acid supplied to the reaction tank 3 A control valve 8 is provided. Therefore, sodium hypochlorite and hydrochloric acid are supplied to the reaction tank 3 using the raw material control valve 8. At this time, the raw material control valve 8 is electrically connected to the control unit 5 and can be automatically controlled.

Subsequently, in the raw material reaction step (S20), sodium chlorite and hydrochloric acid supplied to the reaction tank (3) are mixed to activate an aqueous solution of chlorine dioxide. At this time, a mixer for assisting the mixing of sodium chlorite and hydrochloric acid may be installed in the reaction tank 2.

Subsequently, the chlorine dioxide aqueous solution supplying step (S30) is a step of supplying the chlorine dioxide aqueous solution produced in the reaction tank (3) to the degassing tank (4). At this time, an aqueous solution supply pipe 56 is connected between the reaction tank 3 and the degassing tank 4, and a chlorine dioxide aqueous solution injection pipe 46 is installed in the degassing tank 4. Therefore, the supply amount of the chlorine dioxide aqueous solution supplied to the desalination tank 4 can be adjusted by using the aqueous solution control valve 76 provided in the aqueous solution supply pipe 56. And the aqueous solution control valve 76 may be electrically connected to the control unit 5 and automatically adjusted.

Finally, the chlorine dioxide gas degassing step (S40) is performed by injecting chlorine dioxide aqueous solution into the upper portion of the contact material layer 15 provided inside the degassing vessel 4, When the compressed air is injected into the lower part of the contact layer 15, the downward flow of chlorine dioxide and the upward flow of compressed air come into contact with the contact layer 15 to degas the chlorine dioxide gas from the aqueous solution of chlorine dioxide. Then, the deaerated chlorine dioxide gas ascends and is discharged to the outside through the gas outlet 52.

That is, the chlorine dioxide aqueous solution supplied to the upper part of the degassing vessel 4 passes through the contact material layer 45 filled in the middle part of the degassing vessel 4 by gravity and moves downward, ) Passes through the contact material layer 45 and moves upward. At this time, since the contact material layer 45 has a large surface area, the contact area of the chlorine dioxide aqueous solution and the compressed air is increased, and the chlorine dioxide gas is smoothly discharged. In addition, the contact material layer 45 may be divided into several layers, and contact materials 44 of different sizes may be filled for each layer, thereby maximizing the processing efficiency.

The amount of chlorine dioxide gas discharged from the chlorine dioxide gas outlet 42 is controlled by adjusting the supply amount of the chlorine dioxide aqueous solution supplied to the upper portion of the contact material layer 45, The generation amount of the chlorine dioxide gas can be freely adjusted by adjusting the supply amount of the compressed air or adjusting the discharge amount of the filtrate discharged through the filtrate discharge port 43.

As described above, the conventional chlorine dioxide generating apparatus has been used to generate and store chlorine dioxide in an aqueous solution state. However, it is limited in its use as an aqueous solution containing a large amount of impurities rather than pure chlorine dioxide, There is a disadvantage that the concentration becomes weak. However, since the chlorine dioxide generating apparatus according to the present invention extracts only the pure chlorine dioxide gas generated through the degassing process after generating the aqueous solution of chlorine dioxide, there is no use restriction by the impurities, It does not have the same risks.

In addition, although the conventional chlorine dioxide generating apparatus is merely generating and storing chlorine dioxide, the chlorine dioxide generating apparatus according to the present invention can easily control the amount of generating chlorine dioxide gas, thereby constituting a separate control panel You do not have to.

In addition, the chlorine dioxide generating device according to the present invention can measure the concentration of chlorine dioxide produced through the chlorine dioxide gas outlet and adjust the amount of chlorine dioxide gas generated according to the concentration value.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it can be done. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

1: pure chlorine dioxide generating device 2: storage tank
3: Reaction tank 4: Melting tank
5: control part 8: raw material control valve
9: sensor 41: tank
42: gas outlet 43: filtrate outlet
44: contact material 45: contact material layer
46: aqueous solution injection tube 47: compressed air injection tube
52: gas discharge pipe 53: filtrate discharge pipe
54: nozzle 56: aqueous solution supply pipe
57: compressed air supply pipe 67: compressed air generator
72: gas control valve 73: filtrate control valve
76: aqueous solution control valve 77: compressed air control valve

Claims (9)

A storage tank for storing sodium chlorite and hydrochloric acid separately;
A reaction tank for producing an aqueous solution of chlorine dioxide by reacting sodium chlorite supplied from the storage tank with hydrochloric acid;
And a deaeration tank for purifying the chlorine dioxide gas to generate pure chlorine dioxide gas by injecting compressed air into the activated chlorine dioxide aqueous solution in the reaction tank,
The degassing vessel includes:
A tank having a constant inner space;
A gas outlet provided at an upper end of the tank for discharging the generated pure chlorine dioxide gas to the outside;
A contact material layer in which the contact material having different diameters are separately packed into the tank and divided into several layers, the diameter of the contact material becoming larger as it goes down;
An aqueous solution injection tube for supplying an aqueous solution of chlorine dioxide to the upper portion of the contact material layer;
A compressed air inlet tube for supplying compressed air to a lower portion of the contact material layer;
And a filtrate discharge port provided at a lower end of the tank for discharging the filtrate from which the chlorine dioxide gas is deaerated to the outside.
delete delete delete delete A storage tank for storing sodium chlorite and hydrochloric acid separately; A reaction tank for producing an aqueous solution of chlorine dioxide by reacting sodium chlorite supplied from the storage tank with hydrochloric acid; And a deaeration tank for deionizing the chlorine dioxide gas by injecting compressed air into the aqueous chlorine dioxide solution activated in the reaction tank to generate pure chlorine dioxide gas, wherein the deaeration tank comprises: a tank having an internal space of a predetermined size; A gas outlet provided at an upper end of the tank for discharging the generated pure chlorine dioxide gas to the outside; A contact material layer formed by filling a plurality of contact materials in the tank; An aqueous solution injection tube for supplying an aqueous solution of chlorine dioxide to the upper portion of the contact material layer; A compressed air inlet tube for supplying compressed air to a lower portion of the contact material layer; A compressed air supply pipe for supplying compressed air to the compressed air supply pipe is connected to the compressed air supply pipe, and the compressed air supply pipe is connected to the compressed air supply pipe, There is provided a compressed air generator for generating compressed air and a compressed air control valve for controlling a supply amount of compressed air supplied to the tank, and the aqueous solution injection pipe is provided with an aqueous solution supply pipe connected to the reaction tank for supplying an aqueous chlorine dioxide solution And an aqueous solution control valve for controlling the supply amount of the aqueous solution supplied to the tank is installed in the aqueous solution supply pipe, and a filtrate discharge pipe for discharging the filtrate moved to the lower portion of the tank is installed in the filtrate discharge port, The amount of the filtrate discharged from the tank is stored in the filtrate discharge pipe And a filtrate control valve for controlling the leakage of the compressed air in the tank to the outside, the method comprising the steps of:
A raw material storage and supply step of storing sodium chlorite and hydrochloric acid in the storage tank and supplying the stored sodium chlorite and hydrochloric acid to the reaction tank;
A raw material reaction step of mixing sodium chlorate and hydrochloric acid supplied from the storage tank to produce an aqueous solution of chlorine dioxide;
Supplying a chlorine dioxide aqueous solution activated in the reaction tank to an upper portion of the contact material layer of the degassing tank;
And a chlorine dioxide gas generating step of supplying compressed air to the chlorine dioxide aqueous solution supplied to the deaeration tank to remove pure chlorine dioxide gas from the chlorine dioxide aqueous solution to generate chlorine dioxide gas,
Wherein the chlorine dioxide gas generating step comprises:
The aqueous chlorine dioxide solution injected into the upper portion of the contact material layer flows downward and passes through the contact material layer. The compressed gas injected into the lower portion of the contact material layer moves upward to pass through the contact material layer, The chlorine dioxide gas and the compressed air are in contact with each other to deaerate the chlorine dioxide gas contained in the chlorine dioxide aqueous solution to generate pure chlorine dioxide gas. The contact material layer is divided into several layers, and contact materials of different diameters Whereby the contact time of the chlorine dioxide aqueous solution and the compressed gas is sufficiently increased, and the chlorine dioxide aqueous solution and the compressed air flow smoothly to increase the production efficiency of the chlorine dioxide gas.
The method according to claim 6,
The chlorine dioxide gas generated in the chlorine dioxide gas generating step may be adjusted by adjusting the supply amount of the chlorine dioxide aqueous solution supplied to the upper portion of the tank, adjusting the supply amount of the compressed air supplied to the lower portion of the tank, And the amount of pure chlorine dioxide gas is controlled by adjusting the amount of the filtrate discharged.
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