阅读说明：本技术 一种二氧化氯消毒气体的制备方法 (Preparation method of chlorine dioxide sterilizing gas ) 是由 全艳玲 柳长庆 齐相云 张富刚 张焕章 柳伟生 孟凡钢 姜效军 雷芃 于 2021-02-22 设计创作，主要内容包括：本公开实施例提供一种二氧化氯消毒气体的制备方法,所述制备方法包括以下步骤：分别添加经过计流量调节及加料速率调节的盐酸溶液和二氧化氯水溶液,获得混合溶液；将所述混合溶液进行搅拌,通过活化反应生成初步消毒气体；将所述初步消毒气体与空气按照预定比例混合,生成二氧化氯消毒气体。本公开实施例产生的二氧化氯消毒气体的浓度范围在整个活化过程中保持较好的稳定性,具有持续的稳定的消毒杀菌效果。通过本公开实施例的二氧化氯消毒气体的制备方法可将制备得到的二氧化氯消毒气体实时通入ATM自助设备或现钞清点设备等,对ATM自助设备或现钞清点设备内部及内部现钞进行消毒杀菌。(The embodiment of the disclosure provides a preparation method of chlorine dioxide sterilizing gas, which comprises the following steps: respectively adding a hydrochloric acid solution and a chlorine dioxide aqueous solution which are subjected to flow rate regulation and feeding rate regulation to obtain a mixed solution; stirring the mixed solution, and generating primary disinfection gas through an activation reaction; and mixing the preliminary disinfection gas with air according to a preset proportion to generate chlorine dioxide disinfection gas. The concentration range of the chlorine dioxide sterilizing gas generated by the embodiment of the disclosure keeps better stability in the whole activation process, and has continuous and stable sterilizing effect. According to the preparation method of the chlorine dioxide disinfection gas, the prepared chlorine dioxide disinfection gas can be introduced into ATM self-service equipment or cash counting equipment in real time, and the like, so that the inside of the ATM self-service equipment or the cash counting equipment and the cash in the ATM self-service equipment or the cash counting equipment can be disinfected and sterilized.)

1. A method for preparing chlorine dioxide sterilizing gas is characterized by comprising the following steps:

respectively adding a hydrochloric acid solution and a chlorine dioxide aqueous solution which are subjected to flow rate regulation and feeding rate regulation to obtain a mixed solution;

stirring the mixed solution, and generating primary disinfection gas through an activation reaction;

and mixing the preliminary disinfection gas with air according to a preset proportion to generate chlorine dioxide disinfection gas.

2. The method of claim 1, further comprising adjusting a parameter of the agitation based on a concentration of the chlorine dioxide sterilizing gas.

3. The method according to claim 1, wherein the volume ratio of the hydrochloric acid solution to the aqueous chlorine dioxide solution is (1-6): 1; the mass fraction of hydrochloric acid in the hydrochloric acid solution is 20% -50%, the hydrochloric acid solution comprises an active agent, and the mass fraction of the active agent is 1% -10%; the mass fraction of the chlorine dioxide in the chlorine dioxide aqueous solution is 15-20%.

4. The method according to claim 3, wherein the activator is at least one of an organic acid and a Lewis acid.

5. The method of claim 1, wherein the hydrochloric acid solution is added in a single charge and the aqueous chlorine dioxide solution is added in a batch charge.

6. The method according to claim 5, wherein the hydrochloric acid solution is fed at a rate of 0.5 to 2 mL/s; the feeding speed of the chlorine dioxide water solution is 0.5-2 mL/s.

7. The method according to claim 5, wherein the feeding is carried out in divided portions at intervals of 3 to 15min, and the number of times of feeding is 2 to 10 times.

8. The method according to claim 1, wherein the stirring is intermittent stirring, the intermittent stirring is performed under the condition that the stirring is performed once every 5 to 15 seconds, every 2 to 15 seconds, and the rotation speed of the stirring is 1 to 5 r/s; the stirring is carried out under the pressure of 0.004-0.008 MPa.

9. A method as claimed in claim 1, wherein the preliminary sterilisation gas is activated chlorine dioxide sterilising agent at a volume ratio to air of 1: 4-20.

10. The method according to claim 1, wherein an adsorbent is included in the air, and the adsorbent is acetic acid.

Technical Field

The embodiment of the disclosure relates to the technical field of sanitary devices, in particular to a preparation method of chlorine dioxide disinfection gas.

Background

For other fields needing sterilization and bacteriostasis, such as bank cash counting equipment, government office, medical health, transportation and the like, the prior means is to increase equipment with sterilization and bacteriostasis capabilities, such as ultraviolet irradiation, ultrasonic wave, air sterilization, 84 disinfectant and the like, but the equipment has undesirable effects.

Chlorine dioxide, whose molecular formula is ClO2, is a yellow-green to orange gas. The chlorine dioxide has broad bactericidal spectrum, high efficiency, stable bactericidal efficacy, wide pH application range, safety, no residue and no irritation, and is an internationally recognized green disinfectant.

The existing preparation method of chlorine dioxide comprises two methods, namely sodium chlorate method production and sodium chlorite method production. Wherein, the sodium chlorate method for producing chlorine dioxide can produce a large amount of waste liquid, which does not meet the requirement of environmental protection. Chlorine dioxide is produced by the sodium chlorite method, which includes reacting sodium chlorite with chlorine gas, reacting sodium chlorite with acid, reacting sodium chlorite with sodium hypochlorite and acid, and the like. However, the reaction of sodium chlorite and chlorine needs a matched chlorination unit, and the application value is relatively low. The purity of the sodium chlorite is improved to a certain extent compared with the purity and yield of the sodium chlorite obtained by the reaction of sodium chlorite and acid in other existing modes, but parameters such as raw material concentration, pH and the like need to be strictly controlled in order to ensure the purity, the yield and the like, and the cost is high. In addition, sodium chlorite reacts with acid quickly, and the initial chlorine dioxide concentration is high, but the chlorine dioxide concentration is reduced to a large extent along with the reaction, so that a stable concentration cannot be ensured in a long time range. The reaction of sodium chlorite with sodium hypochlorite and acid needs to be divided into two stages, the sodium hypochlorite and the acid react to produce chlorine gas firstly, and then the chlorine dioxide is prepared by the reaction of the sodium hypochlorite and the sodium chlorite, and the operation is complex.

Disclosure of Invention

An object of the disclosed embodiment is to provide a preparation device and a preparation method for a sterilizing gas, so as to solve the problem of non-ideal sterilization existing in the prior art.

In order to solve the technical problem, the embodiment of the present disclosure adopts the following technical solutions: a method of producing chlorine dioxide sterilizing gas, said method comprising the steps of: respectively adding a hydrochloric acid solution and a chlorine dioxide aqueous solution which are subjected to flow rate regulation and feeding rate regulation to obtain a mixed solution; stirring the mixed solution, and generating primary disinfection gas through an activation reaction; and mixing the preliminary disinfection gas with air according to a preset proportion to generate chlorine dioxide disinfection gas.

In some embodiments, further comprising adjusting a parameter of the agitation based on the concentration of the chlorine dioxide sterilizing gas.

In some embodiments, the volume ratio of the hydrochloric acid solution to the aqueous chlorine dioxide solution is (1-6): 1; the mass fraction of hydrochloric acid in the hydrochloric acid solution is 20% -50%, the hydrochloric acid solution comprises an active agent, and the mass fraction of the active agent is 1% -10%; the mass fraction of the chlorine dioxide in the chlorine dioxide aqueous solution is 15-20%.

In some embodiments, the active agent is at least one of an organic acid, a lewis acid.

In some embodiments, the hydrochloric acid solution is added in a one-shot addition and the aqueous chlorine dioxide solution is added in a batch addition.

In some embodiments, the hydrochloric acid solution is fed at a rate of 0.5 to 2 mL/s; the feeding speed of the chlorine dioxide water solution is 0.5-2 mL/s.

In some embodiments, the feeding is carried out in a batch mode at intervals of 3-15min, and the feeding is carried out in batches for 2-10 times;

in some embodiments, the stirring is intermittent stirring, the intermittent stirring is performed once every 5-15s, every 2-15s, and the stirring speed is 1-5 r/s; the stirring is carried out under the pressure of 0.004-0.008 MPa.

In some embodiments, the preliminary sterilizing gas is activated chlorine dioxide disinfectant at a volume to air ratio of 1: 4-20;

in some embodiments, an adsorbent is included in the air, the adsorbent being acetic acid.

Compared with the prior art, in the process of preparing the chlorine dioxide disinfection gas, the hydrochloric acid solution is added in a one-time feeding mode, the chlorine dioxide aqueous solution is added in batches, and the chlorine dioxide aqueous solution is mixed with air in a preset stirring mode, so that the concentration range of the generated chlorine dioxide disinfection gas keeps better stability in the whole activation process, and the continuous and stable disinfection and sterilization effect is achieved. In practical application, the device can be directly connected to the environment to be disinfected and sterilized through a line and can be directly used, so that the long-time stable disinfection and sterilization effect is ensured. According to the preparation method of the chlorine dioxide disinfection gas, the prepared chlorine dioxide disinfection gas can be introduced into ATM self-service equipment or cash counting equipment in real time, and the like, so that the inside of the ATM self-service equipment or the cash counting equipment and the cash in the ATM self-service equipment or the cash counting equipment can be disinfected and sterilized.

Drawings

Fig. 1 is a schematic structural view of a preparation apparatus for sterilizing gas according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a generating device in a preparation device for sterilizing gas according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a generating device in a preparation device for sterilizing gas according to an embodiment of the present disclosure;

fig. 4 is a step diagram of a method for producing a sterilizing gas according to an embodiment of the present disclosure.

Reference numerals:

100-a first housing; 1-a first container; 11-a first liquid outlet; 2-a generating device; 21-a first liquid inlet, 22-a second liquid inlet; 23-a third liquid outlet; 24-an air inlet; 25-air outlet; 3-a second container; 31-a second outlet; 4-a secondary residual liquid tank; 200-a second housing; 201-first stage raffinate pump; 202-brushless air pump; 203-first level residual liquid tank; 204-a mixing drum; 205-a first metering pump; 206-a second metering pump; 207-stirring cylinder; 208-a secondary raffinate pump; 209-stirring element; 210-one-way valve.

Detailed Description

Various aspects and features of the disclosure are described herein with reference to the drawings.

It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.

It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.

The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.

The embodiment of the disclosure relates to a preparation method of chlorine dioxide disinfection gas, wherein the chlorine dioxide disinfection gas is suitable for cleaning requirements of different fields such as government offices, medical health, transportation and the like, and is particularly suitable for bank cash counting equipment, and the prepared chlorine dioxide disinfection gas is used for sterilizing and disinfecting cash in the cash counting equipment.

The disclosed embodiment provides a preparation method for a sterilizing gas, and it should be noted that, in order to implement the preparation method of the disclosed embodiment, a preparation device matched with the preparation method may be adopted, and in one embodiment, the preparation device is configured as shown in fig. 1 and 2, and includes a first housing 100, and a first container 1, a generating device 2, a second container 3 and a secondary raffinate tank 4 which are arranged in the first housing 100, a control device is arranged on the housing 100 to control a preparation process of the chlorine dioxide sterilizing gas, a liquid a raw material is contained in the first container 1, where the liquid a raw material is a hydrochloric acid solution, the first container 1 has a first liquid outlet 11, a liquid B raw material is contained in the second container 3, where the liquid B raw material is a chlorine dioxide aqueous solution, the second container 3 has a second liquid outlet 31, the generating device 2 is used for mixing and reacting the hydrochloric acid solution and the chlorine dioxide aqueous solution to form a mixed solution, and for this purpose, the generating device 2 is provided with a first liquid inlet 21, a second liquid inlet 22, a third liquid outlet 23, a gas inlet 24 and a gas outlet 25, the first liquid outlet 11 of the first container 1 and the second liquid outlet 31 of the second container 3 are respectively connected with the first liquid inlet 21 and the second liquid inlet 22 of the generating device 2 through pipelines, the third liquid outlet 23 of the generator 2 is connected with the secondary residual liquid tank 4 through a pipeline to output residual liquid generated after the hydrochloric acid solution and the chlorine dioxide aqueous solution react, a check valve 210 is provided at the air inlet 24, the air inlet 24 being for inputting air, the air inlet is controlled by the one-way valve 210, and the air outlet 25 is used for outputting chlorine dioxide sterilizing gas generated by the reaction.

Further, the generating device 2 is configured to perform a mixing reaction on the hydrochloric acid solution in the first container 1 and the chlorine dioxide aqueous solution in the second container 3 to generate a chlorine dioxide sterilizing gas, and the structure of the generating device 2 is as shown in fig. 2 and 3, the generating device 2 includes a second housing 200, the first liquid inlet 21, the second liquid inlet 22 and the gas inlet 24 are respectively disposed on an upper surface of the second housing 200, as shown in fig. 2 and 3 in combination with fig. 1, a metering pump, a stirring cylinder 207 and a mixing cylinder 204 are sequentially disposed in the second housing 200, wherein the metering pump is preferably disposed above the second housing 200 and includes a first metering pump 205 and a second metering pump 206, the first metering pump 205 and the second metering pump 206 are respectively connected to the first liquid inlet 21 and the second liquid inlet 22, the hydrochloric acid solution in the first container 1 and the chlorine dioxide aqueous solution in the second container 3 enter the generator 2 through the first liquid inlet 21 and the second liquid inlet 22, and flow rates of the hydrochloric acid solution and the chlorine dioxide aqueous solution are adjusted through the first metering pump 205 and the second metering pump 206, wherein the flow rate adjustment is set based on factors such as required concentration of chlorine dioxide disinfection gas.

Further, the outlet sides of the first metering pump 205 and the second metering pump 206 are connected to the stirring cylinder 207, and the flow-regulated hydrochloric acid solution and the chlorine dioxide aqueous solution are mixed and then stirred in the stirring cylinder 207, wherein a stirrer 209 is disposed in the stirring cylinder 207 to enable the hydrochloric acid solution and the chlorine dioxide aqueous solution to be more fully mixed and reacted through stirring by the stirrer 209.

In order to further enhance the effect of the mixing reaction between the hydrochloric acid solution and the chlorine dioxide aqueous solution, a brushless air pump 202 is disposed in the second housing 200, and the brushless air pump 202 is communicated with the mixing drum 204 to form a negative pressure environment in the mixing drum 207 and the stirring drum 207, for example, a negative pressure environment of 0.005MPA may be formed to promote the stirring and mixing of the hydrochloric acid solution and the chlorine dioxide aqueous solution.

In order to discharge a residual liquid, in one embodiment, a secondary residual liquid pump 208 is disposed in the second housing 200, and the mixing drum 207 is directly connected to the secondary residual liquid tank 4 through the secondary residual liquid pump 208; in another embodiment, a primary residual liquid pump 201 and a primary residual liquid tank 203 are provided in the second housing 200, the mixing drum 207 is connected to the primary residual liquid tank 203 through the primary residual liquid pump 201, the primary residual liquid tank 203 is connected to the secondary residual liquid tank 4, so that residual liquid after a mixing reaction in the mixing drum 207 flows into the primary residual liquid tank 203 and finally into the secondary residual liquid tank 4 under the driving of the primary residual liquid pump 201, and further, the primary residual liquid tank 203 is connected to the secondary residual liquid tank 4 through a secondary residual liquid pump 208. In addition, a liquid level sensor can be arranged in the primary residual liquid tank 203, and when the residual liquid in the primary residual liquid tank 203 reaches a certain liquid level, the residual liquid in the primary residual liquid tank 203 is controlled to flow into the secondary residual liquid tank 4 through the secondary residual liquid pump 208, so that manual cleaning or recycling is facilitated.

As described above, the agitating drum 207 is connected to the air mixing drum 204, and the preliminary sterilizing gas generated by the mixing reaction of the agitating drum 207 is fed into the air mixing drum 204. Second casing 200 last air inlet 24 through the pipeline with the churn 207 is connected, because all form negative pressure environment in churn 207 and the wind section of thick bamboo 204 that mixes, consequently, churn 207 to carry preliminary sterile gas and air in the wind section of thick bamboo 204 that mixes, like this preliminary sterile gas and the air that the mixed reaction generated in the churn 207 are in mix intensive mixing in the wind section of thick bamboo 204 to acquire the sterile gas of required concentration. In order to further improve the mixing effect of the gas, a baffle plate layer structure is arranged in the mixing air cylinder 204, wherein the channel accounts for about 10% -30% of the baffle plate layer structure, so that the primary sterilizing gas and the air can be mixed more fully and uniformly in the mixing air cylinder 204.

With the above-mentioned apparatus for producing sterilizing gas, the first container 1 is filled with the hydrochloric acid solution in advance, and the second container 3 is filled with the chlorine dioxide aqueous solution in advance, wherein the chlorine dioxide aqueous solution may be a deionized water solution containing 15% -20% chlorine dioxide, the hydrochloric acid solution and the chlorine dioxide aqueous solution whose flow rates are adjusted by the first and second metering pumps 205 and 206 are mixed to form a mixed solution, and then the mixed solution is stirred by the stirrer 209 in the stirring cylinder 207 to sufficiently mix and react, so that a preliminary sterilizing gas with adjustable concentration and controllable speed is generated according to the reaction amount of the hydrochloric acid solution and the chlorine dioxide aqueous solution, and the preliminary sterilizing gas is mixed with air in the mixing cylinder 204 to finally generate a sterilizing gas with a specified concentration, the sterilizing gas is sent from the gas outlet 25 of the generating device 2 to equipment such as paper money sorting and application sites. In addition, the residual liquid generated by the reaction of the hydrochloric acid solution and the chlorine dioxide aqueous solution finally flows into the secondary residual liquid tank 4 and is taken out after manual cleaning or recycling. The control means on the housing 100 enables the automatic control of the above-described sterilizing gas preparation process.

In the embodiment, the preparation method for the sterilizing gas is described by taking the hydrochloric acid solution as the hydrochloric acid solution and the chlorine dioxide aqueous solution as the liquid a raw material, and taking the preparation method for the chlorine dioxide sterilizing gas as an example, as shown in fig. 4, the preparation method adopted by the embodiment comprises the following steps:

and S101, respectively adding a hydrochloric acid solution and a chlorine dioxide aqueous solution which are subjected to flow regulation and feeding rate regulation to obtain a mixed solution.

In the step, the hydrochloric acid solution is used as a liquid A raw material, and the chlorine dioxide aqueous solution is used as a liquid B raw material, wherein the volume ratio of the hydrochloric acid solution to the chlorine dioxide aqueous solution is (1-10): 1; preferably, the volume ratio of the hydrochloric acid solution to the chlorine dioxide aqueous solution is (1-6): 1.

Further, in the hydrochloric acid solution, the mass fraction of the hydrochloric acid is 20-50%; further, the solution containing hydrochloric acid also comprises an active agent, wherein the active agent comprises any one or more of organic acid and Lewis acid, and preferably, the organic acid and the Lewis acid are adopted to be simultaneously matched in the hydrochloric acid solution, so that the high conversion rate and the long-term conversion activity of the active agent can be ensured. The organic acid herein may be, for example, any one or more of citric acid, oxalic acid and tartaric acid, and the lewis acid may be any one or more of boron trifluoride, aluminum chloride, ferric chloride, antimony pentafluoride; preferably, the mass fraction of the active agent is 1% -10%; the mass fraction of the chlorine dioxide in the chlorine dioxide aqueous solution is 15% -20%, and the preparation process of the chlorine dioxide aqueous solution refers to the preparation method of the conventional stable chlorine dioxide aqueous solution. For example, chlorine dioxide gas produced by a conventional method is introduced into an aqueous solution containing a stabilizer, wherein the stabilizer includes an inorganic stabilizer and an organic stabilizer, such as an inorganic salt solution or a sodium percarbonate solution, to produce a stable aqueous solution of chlorine dioxide.

In one embodiment, the hydrochloric acid herein may be formulated in a manner that: taking 100mL of hydrochloric acid aqueous solution with the mass fraction of 30%, adding 10g of citric acid into the hydrochloric acid aqueous solution, and uniformly mixing the citric acid and the hydrochloric acid aqueous solution under the stirring condition to obtain hydrochloric acid solution containing an active agent; the configuration of the chlorine dioxide aqueous solution herein may be: chlorine dioxide gas obtained by reacting sodium chlorite and hydrochloric acid is introduced into aqueous solution containing stabilizer such as sodium percarbonate to prepare stable chlorine dioxide aqueous solution containing 20% of chlorine dioxide by mass fraction.

Further, the hydrochloric acid solution in the first container 1 is adjusted by the first metering pump 205 and then is input into the stirring cylinder 207 in a one-time feeding manner at a flow rate of 0.5-2mL/s, for example, 10-30mL can be added at one time; the chlorine dioxide aqueous solution in the second container 2 is adjusted by the second metering pump 206 and then is input into the stirring cylinder 207 at a flow rate of 1ml/s, wherein the chlorine dioxide aqueous solution can be added in batches according to the required concentration range for the primary sterilizing gas, such as a concentration value of 100ppm to 1000ppm, wherein the batches are added at intervals of 3-15min for 2-10 times; more preferably, the feeding mode in batches is that the feeding is carried out once every 3-5min, the feeding times in batches are 5-8, the interval time is adjusted so as to finally obtain the chlorine dioxide sterilizing gas with different concentration ranges, and meanwhile, the concentration change fluctuation of the generated chlorine dioxide sterilizing gas is small and the concentration stability is high in the subsequent whole process of generating the chlorine dioxide sterilizing gas through activation, so that the prepared sterilizing gas has stable sterilizing effect. Thus, the chlorine dioxide aqueous solution is required to be added dropwise in one raw material input period, and the hydrochloric acid solution and the chlorine dioxide aqueous solution are added again after the residual liquid after the reaction in the primary residual liquid tank 203 is discharged.

S102, stirring the mixed solution, and generating primary disinfection gas through an activation reaction.

In this step, the hydrochloric acid solution and the chlorine dioxide aqueous solution are mixed in the agitating drum 207 and the mixed solution is agitated by the agitator 209 so that a preliminary sterilizing gas is generated by an activation reaction between the hydrochloric acid solution and the chlorine dioxide aqueous solution. In this step, primary sterilizing gases of different volumes are generated according to different ratios of the hydrochloric acid solution and the chlorine dioxide aqueous solution, and are stirred by the stirrer 209 at different stirring rates at different intervals to generate sterilizing gases of different concentrations, and the conversion efficiency, yield, purity and the like are improved through stirring treatment. The stirring herein may be intermittent stirring, and preferably, the intermittent stirring is performed under the condition of stirring once every 5 to 15 seconds, and 2 to 15 seconds for each stirring; preferably, the rotation speed of the stirring is 15 r/s. In this way, a high concentration of sterilizing gas (concentration value 100ppm to 1000ppm) is generated in the agitating drum 207, wherein the agitating drum 207 is connected to the air mixing drum 204, the air mixing drum 204 is connected to the brushless air pump 202, negative pressure, for example, 0.005MPA, is formed in the air mixing drum 207 and the agitating drum 207 by the brushless air pump 202, and a predetermined flow rate of the sterilizing gas is generated by PWM speed control via the brushless air pump 202.

In the step, free chlorine dioxide is stably released by stirring, and meanwhile, the concentration of the obtained primary sterilizing gas can be ensured to be within a required concentration range (such as 100 ppm-1000 ppm), and the difference between the concentration and the concentration is small in the range. If the continuous stirring or the over-quick stirring is carried out, the generation rate of the chlorine dioxide is over-quick, the concentration of the obtained primary disinfection gas is too high, the primary disinfection gas is not suitable for being used in a subsequent disinfection scene, and the initial reaction is over-quick, so that the concentration of the obtained final chlorine dioxide disinfection gas is sharply reduced, the obtained product has poor concentration stability and unstable sterilization effect; if the interval time is too long or the stirring is too slow, the generation rate of the chlorine dioxide is too slow, the conversion efficiency is low, the concentration is too low, and the sterilizing effect is insufficient.

In addition, the concentration of the obtained chlorine dioxide disinfectant can be adjusted by adjusting the interval time of intermittent stirring treatment, the stirring rotating speed and the like, so that the chlorine dioxide disinfectant with small concentration fluctuation and different requirements can be prepared.

Further, this step may be performed based on a negative pressure environment, for example, a negative pressure environment may be formed in the agitating drum 207 by the brushless air pump 202 communicated with the air mixing drum 204, and the pressure of the negative pressure environment is 0.004-0.008 MPa; preferably, the pressure of the reaction system is 0.004-0.006 MPa.

S103, mixing the preliminary disinfection gas with air according to a preset proportion to generate chlorine dioxide disinfection gas.

In this step, the high-concentration preliminary sterilizing gas generated in the agitating drum 207 and the air introduced through the one-way valve 210 are fed into the air mixing drum 204, and the preliminary sterilizing gas and the air are mixed in the air mixing drum 204 at a predetermined ratio, wherein the volume ratio of the preliminary sterilizing gas to the air is 1: 4-20, and the chlorine dioxide sterilizing gas is finally generated. Further, the air includes therein an adsorbent including at least acetic acid. Of course, the primary sterilizing gas and air obtained by activation can be conveyed through different pipelines, and the pipelines adopt different flow rates to ensure that the primary sterilizing gas and the air can be mixed in real time in proportion.

In this step, the primary sterilizing gas generated in the agitating drum 207 and the air entering through the one-way valve 210 are fully mixed by the partition plate layer structure in the mixing drum 204, and finally the stable sterilizing gas with the designated concentration, for example, 5ppm to 200ppm, is generated and finally delivered to various equipment and places needing sterilization.

By mixing the primary sterilizing gas with air in proportion, more stable chlorine dioxide sterilizing gas (e.g. 5ppm-200 ppm) can be obtained. The mixing proportion of the preliminary disinfection gas obtained by activation and the air can be adjusted according to the actual use place of the disinfectant, so that the finally prepared disinfection product gas is suitable for the corresponding place to realize high-efficiency sterilization and disinfection.

The step may further include a step of collecting the reacted residual liquid through a residual liquid tank. In this step, can through collect by second grade raffinate case 4, also can through first order raffinate case 203 with second grade raffinate case 4 carries out the two-stage and collects, makes the raffinate can be convenient for manual cleaning or cyclic utilization finally.

In some embodiments, a substance capable of facilitating the adhesion of a disinfecting substance, such as sodium hypochlorite, acetic acid, calcium hypochlorite, sodium peroxide, or hypochlorous acid, to the surface of the bill may also be added to the final disinfecting gas.

The method for preparing a sterilizing gas according to the embodiment of the present disclosure may further include the steps of:

and S104, adjusting stirring parameters based on the concentration of the chlorine dioxide disinfection gas.

In this step, in order to make the concentration of the chlorine dioxide sterilizing gas obtained in the above step S104 be within the above specified concentration range, a concentration detection device may be disposed at the outlet of the mixing drum 204 to obtain the concentration of the chlorine dioxide sterilizing gas output through the mixing drum 204, and when the concentration is not within the specified concentration range, the stirring parameter in the step S102 is adjusted, so as to adjust the mixing degree between the hydrochloric acid solution and the chlorine dioxide aqueous solution.

The sterilizing gas prepared by the preparation method can realize the sterilizing effect in equipment such as cash counting and the like. The practical effects of the sterilizing gas according to the embodiments of the present disclosure will be described below based on two examples for sterilizing cash in a paper money sorting apparatus.

Example 1 tests were carried out on the interior of the chamber of a banknote sorting device with chlorine dioxide gas (concentration of the employed sterilizing gas is 50 ppm); the following table shows the experimental results of the paper currency sorting and the vaporization of the comprehensive disinfection bacteriostat of the ATM self-service equipment through a simulation field disinfection test.

Example 1.1: chlorine dioxide gas test inside the chamber of the banknote sorting device (concentration of the employed sterilizing gas is 50ppm)

Results of the test of the killing effect of Escherichia coli

Note: negative control sterile growth; average number of bacteria and range of positive control: 4.10X 10⁶(3.97×10⁶-4.32×10⁶cfu/tablet)

Example 1.2: chlorine dioxide gas test inside the chamber of the banknote sorting device (concentration of the employed sterilizing gas is 50ppm)

Test results of killing effect of Staphylococcus aureus

Note: negative control sterile growth; average number of bacteria and range of positive control: 2.58X 10⁶(1.87×10⁶-3.18×10⁶cfu/tablet)

Example 2 tests were carried out on the interior of the chamber of the banknote sorting device with chlorine dioxide gas (concentration of the employed sterilisation gas is 100 ppm); the following table shows the experimental results of the paper currency sorting and the vaporization of the comprehensive disinfection bacteriostat of the ATM self-service equipment through a simulation field disinfection test.

Example 2.1: testing of gas (the concentration of adopted disinfection gas is 100ppm) in chlorine dioxide banknote-passing channel in banknote sorting equipment

Test results of killing effect of Staphylococcus aureus

Note: negative control sterile growth; average number of bacteria and range of positive control: 4.10X 10⁶(3.97×10⁶-4.32×10⁶cfu/tablet)

Example 2.2: chlorine dioxide banknote-passing channel gas (concentration of adopted disinfection gas is 100ppm) in banknote sorting equipment

Results of Escherichia coli Effect test

Note: negative control sterile growth; average number of bacteria and range of positive control: 2.58X 10⁶(1.87×10⁶-3.18×10⁶cfu/tablet)

The above embodiments are merely exemplary embodiments of the present disclosure, which is not intended to limit the present disclosure, and the scope of the present disclosure is defined by the claims. Various modifications and equivalents of the disclosure may occur to those skilled in the art within the spirit and scope of the disclosure, and such modifications and equivalents are considered to be within the scope of the disclosure.