TWI564243B - Method for absorbing chlorine dioxide - Google Patents

Description

Method for adsorbing chlorine dioxide

The present invention relates to a method for adsorbing chlorine dioxide, and more particularly to a method for adsorbing chlorine dioxide which can reduce the escape rate of chlorine dioxide molecules.

Chlorine dioxide is a new generation of disinfectant. Its double bond in the structure has unpaired electrons, so it is easy to generate free radicals and has strong oxidizing ability. It has strong penetrating power against bacteria and viruses and can oxidize bacteria and viruses. Protein, fat and nucleic acid, thus effectively eliminating or inhibiting bacteria and viruses.

In addition, when chlorine dioxide is added to the water body, it does not react with organic substances in the water to form carcinogens such as trihalomethanes. Therefore, it is not carcinogenic, teratogenic or mutagenic to cells, sperm and chromosomes of higher animals. Therefore, chlorine dioxide disinfectant It has high safety and is suitable for various purposes such as water treatment, aquaculture water disinfection, food processing, animal husbandry or environmental sanitation.

However, chlorine dioxide molecules have the characteristics of easy to escape, making chlorine dioxide difficult to store. Therefore, most of the commercially available chlorine dioxide disinfection products need to be used immediately after manufacture. Otherwise, after long-term placement, chlorine dioxide will escape to the outside world. Reducing the available chlorine dioxide components results in poor disinfection.

Therefore, there is still a need to provide a method of adsorbing chlorine dioxide to reduce the rate of escape of chlorine dioxide molecules in chlorine dioxide disinfecting products.

The invention provides a method for adsorbing chlorine dioxide, which can effectively reduce the escape velocity of chlorine dioxide molecules.

A method for adsorbing chlorine dioxide, comprising: providing an aqueous solution of chlorine dioxide; dispersing an adsorbent into an adsorbent dispersion, and the adsorbent is a cerium oxide particle, a titanium dioxide particle, a montmorillonite particle Or a sodium magnesium citrate particle; and at 0 to 30 ° C, the chlorine dioxide aqueous solution is added to the adsorbent dispersion, so that the chlorine dioxide molecule contained in the chlorine dioxide aqueous solution is adsorbed by the adsorbent . Thereby, the adsorbent is adsorbed to the chlorine dioxide molecule, and the chlorine dioxide molecule can be prevented from escaping to the external environment, thereby achieving the effect of reducing the escape rate of the chlorine dioxide molecule in the mixed liquid.

The aqueous solution of chlorine dioxide was added to the adsorbent dispersion at 10 ° C. Thereby, the solubility of the chlorine dioxide molecule can be further increased, and the chlorine dioxide molecule can be prevented from being dispersed before being adsorbed by the adsorbent to lower the concentration.

Among them, an adsorbent dispersion having a concentration of 0.01 to 5 wt% is provided, whereby the adsorbent can sufficiently adsorb chlorine dioxide molecules in the chlorine dioxide aqueous solution to prevent the chlorine dioxide molecules from being adsorbed and dispersed.

Wherein the adsorbent is combined with water to form the adsorbent dispersion. By using water as a dispersing agent, the dispersing agent can be prevented from reacting with the chlorine dioxide molecule, so that the chlorine dioxide molecule loses the ability to generate free radicals.

Wherein, the chlorine dioxide aqueous solution is added to the adsorbent dispersion liquid, and the chlorine dioxide aqueous solution and the adsorbent dispersion liquid system together form a mixed liquid, and the chlorine dioxide adsorption method further comprises: adjusting the mixing. The pH of the liquid is 0-7, thereby promoting the adsorption of chlorine dioxide molecules by the adsorbent.

Wherein, the pH of the mixed solution is adjusted to be <5, whereby the adsorption of the chlorine dioxide molecules by the adsorbent can be further promoted.

Wherein, the pH of the mixed solution is adjusted with hydrochloric acid, nitric acid or sulfuric acid, and the acid does not undergo a redox reaction with the chlorine dioxide molecule, so that the reaction of the inorganic acid with the chlorine dioxide molecule can be avoided. And causing the chlorine dioxide molecule to lose free radical generation ability.

Among them, the aqueous chlorine dioxide solution having a concentration of 5 to 2,000 ppm is provided. Thereby, the concentration of the chlorine dioxide aqueous solution can be prevented from being too low to perform the disinfection function, or the concentration of the chlorine dioxide aqueous solution is too high, so that the excessive chlorine dioxide molecules are dispersed and accumulated in the gas phase, thereby causing an explosion. Sex.

Here, the chlorine dioxide aqueous solution is added to the adsorbent dispersion liquid while stirring at a number of revolutions of 50 to 100 rpm. Thus, the chlorine dioxide molecule and the adsorbent can be uniformly dispersed in the mixed solution.

The particle size of the cerium oxide particles is 2 nm to 10 μm. Thereby, the particle size of the cerium oxide particles can be prevented from being excessively large, resulting in a large gap between the cerium oxide particles and incomplete adsorption of the chlorine dioxide molecules.

The titanium dioxide particles have a particle diameter of 7 nm to 10 μm. Thereby, the titanium dioxide particles can be appropriately dispersed around the chlorine dioxide molecule and completely adsorb the chlorine dioxide molecules.

The method for adsorbing chlorine dioxide of the present invention is to prevent the chlorine dioxide molecule from escaping to the external environment by mixing the chlorine dioxide aqueous solution and the adsorbent dispersion liquid to adsorb the adsorbent to the chlorine dioxide molecule. The effect of reducing the rate of escape of the chlorine dioxide molecule in the mixture is achieved.

Figure 1: The relative content of chlorine dioxide in each sample to be tested in this test.

The above and other objects, features and advantages of the present invention will become more apparent and understood. By adsorbing one or two with an adsorbent The chlorine molecule is oxidized so that the chlorine dioxide molecule is not easily escaped to the outside.

In detail, the chlorine dioxide molecule can be dissolved in water to form an aqueous solution of chlorine dioxide, wherein the concentration of the aqueous chlorine dioxide solution can be 5 to 2,000 ppm, by dissolving the aqueous solution of chlorine dioxide as described above. The concentration can ensure that the chlorine dioxide aqueous solution has a sufficient disinfecting effect on bacteria and viruses, and further, the concentration exceeding 2,000 ppm exceeds the solubility of chlorine dioxide in water and cannot be formulated. Moreover, the method of preparing the aqueous solution of chlorine dioxide is not limited. For example, a mixed aqueous solution containing one of sodium chloride and sodium chlorite may be provided, and the mixed aqueous solution may be continuously electrolyzed to cause oxidation of the sodium chlorite. The chlorine dioxide gas is generated, so that high-purity chlorine dioxide molecules can be obtained, and the chlorine dioxide molecule can be obtained by dissolving the high-purity chlorine dioxide molecules obtained by electrolysis in an appropriate amount of water.

Further, an adsorbent is dispersed into an adsorbent dispersion. It should be noted that the adsorbent may be selected to not undergo redox reaction with the chlorine dioxide molecule, so as to avoid the chlorine dioxide molecule and the adsorbent when the adsorbent adsorbs the chlorine dioxide molecule. The redox reaction occurs, causing the chlorine dioxide molecule to lose its ability to generate free radicals. For example, the adsorbent may be a cerium oxide particle, a titanium dioxide particle, a hectorite particle or a sodium magnesium citrate particle. In this embodiment, the cerium oxide particle is granulated. The diameter is 2 nm to 10 μm, and the particle diameter of the titanium dioxide particles is 7 nm to 10 μm.

Furthermore, the adsorbent dispersion further comprises a dispersing agent for dispersing the adsorbent in the adsorbent dispersion, and the dispersing agent is preferably selected from the chlorine dioxide. The numerator reaction can also prevent the dispersant from reacting with the chlorine dioxide molecule, so that the chlorine dioxide molecule loses the ability to generate free radicals. In the present embodiment, the dispersion is water, and the concentration of the adsorbent dispersant is 0.01 to 5 wt%.

In addition, the aqueous chlorine dioxide solution may be added to the adsorbent dispersion at a temperature of 0 to 30 ° C to form a mixed solution, and the adsorbent may be dispersed around the chlorine dioxide molecule and completely adsorbed. The chlorine dioxide molecule is formed together with the chlorine dioxide molecule a composite, at the same time, can be uniformly dispersed in the mixed solution by the adsorbent, so that the composite can be uniformly distributed in the mixed liquid, thereby reducing the possibility that the chlorine dioxide molecule escapes to the external environment. . Further, the aqueous chlorine dioxide solution is preferably added to the adsorbent dispersion at a temperature of 10 ° C, whereby the rate at which the chlorine dioxide molecules escape can be lowered.

Preferably, the pH of the mixed solution can also be adjusted to 0-7 by a pH adjusting agent. For example, the pH adjusting agent can be a mineral acid such as hydrochloric acid, nitric acid or sulfuric acid, and the inorganic acid system does not The oxidation-reduction reaction with the chlorine dioxide molecule can also prevent the inorganic acid from reacting with the chlorine dioxide molecule, so that the chlorine dioxide molecule loses the ability to generate free radicals, preferably by adjusting the pH. The pH of the mixture is <5, and the rate of escape of the chlorine dioxide molecules can be reduced by the temperature range and the environment of the acidic aqueous solution.

Further, in order to enhance the effect of adsorbing the chlorine dioxide molecule by the adsorbent, when the aqueous chlorine dioxide solution is added to the adsorbent dispersion, the mixture may be stirred at a speed of 50 to 100 rpm at the same time, so that The chlorine dioxide molecule and the adsorbent are uniformly dispersed in the mixed solution, and if the rotation speed is higher than the range, the rate at which the chlorine dioxide molecule escapes may be accelerated.

In order to confirm that the chlorine dioxide adsorption method of the present invention can indeed reduce the escape rate of chlorine dioxide molecules, the following test is carried out: in this test, the cerium oxide particles (group a) and the titanium dioxide particles are respectively used. (Group b) As the adsorbent, 5 g of the adsorbent was separately dispersed in 945 g of water, and 50 g of an aqueous chlorine dioxide solution (concentration: 2,000 ppm) was slowly added thereto at a temperature of 10 ° C. To form the mixture, and adjust the pH of the mixture to 5, while stirring the mixture at 50 rpm for 30 minutes, so that the adsorbents of each group can adsorb the chlorine dioxide molecules, that is, each group can be obtained. Test the sample.

The samples to be tested of each group were continuously left at room temperature for 25 days, and the chlorine dioxide content of each sample to be tested was measured periodically, and the initial value was taken as 100%, and the results are shown in Fig. 1. In this test, an aqueous solution of chlorine dioxide having a concentration of 100 ppm was used as a control group (Group c).

Please refer to Figure 1. The sample to be tested in group a can maintain the chlorine dioxide content of about 75% until the 25th day, while the sample to be tested in group b can be maintained at more than 50%. The content of the aqueous chlorine dioxide solution is greatly reduced to only 20%, which shows that the adsorption method of the chlorine dioxide of the present invention can effectively reduce the escape rate of chlorine dioxide molecules, wherein the effect of the cerium oxide particles is further More significant.

In addition, the hectorite particles (group d) and the magnesium magnesium niobate particles (group e) are used as the adsorbent, respectively, and the samples to be tested in the groups d and e are obtained under the same test conditions, and The chlorine dioxide content of the samples of the d and e groups after standing for 25 days at room temperature was measured. The results show that the sample to be tested in the d group can maintain the chlorine dioxide content of 59.2% or more until the 25th day, and the sample to be tested in the e group can be maintained at 53.0% or more, and the chlorine dioxide of the present invention is confirmed again. The adsorption method can effectively reduce the escape rate of chlorine dioxide molecules.

In summary, the chlorine dioxide adsorption method of the present invention is formed by adsorbing the adsorbent on the chlorine dioxide molecule to form the composite together with the chlorine dioxide molecule, and the adsorbent can be dispersed in the composite. In the mixed solution, the composite can be evenly distributed in the mixed liquid, so that the chlorine dioxide molecule can be prevented from escaping to the external environment, and the escape rate of the chlorine dioxide molecule in the mixed solution can be reduced. The effect.

Moreover, since the chlorine dioxide molecule can be present in the mixed solution for a long time without being dissipated from the mixed liquid, the mixed liquid can be applied as a disinfecting product, and the disinfecting product is placed for a long time. It can still have sufficient disinfection effect, which is the effect of the invention.

While the present invention has been disclosed in the above embodiments, it is not intended to limit the scope of the present invention. The scope of protection of the invention is therefore defined by the scope of the appended claims.

Claims (11)

A method for adsorbing chlorine dioxide, comprising: providing an aqueous solution of chlorine dioxide; dispersing an adsorbent into an adsorbent dispersion, and the adsorbent is a cerium oxide particle, a titanium dioxide particle, a montmorillonite particle Or a sodium magnesium citrate particle; and at 0 to 30 ° C, the chlorine dioxide aqueous solution is added to the adsorbent dispersion, so that the chlorine dioxide molecule contained in the chlorine dioxide aqueous solution is adsorbed by the adsorbent . The method for adsorbing chlorine dioxide according to claim 1, wherein the chlorine dioxide aqueous solution is added to the adsorbent dispersion at 10 °C. The method for adsorbing chlorine dioxide according to the first aspect of the patent application, wherein the adsorbent dispersion having a concentration of 0.01 to 5 wt% is provided. The method for adsorbing chlorine dioxide according to claim 3, wherein the adsorbent is combined with water to form the adsorbent dispersion. The method for adsorbing chlorine dioxide according to claim 1, wherein the chlorine dioxide aqueous solution is added to the adsorbent dispersion, and the chlorine dioxide aqueous solution and the adsorbent dispersion are combined to form a mixture. And the method for adsorbing the chlorine dioxide further comprises: adjusting the pH of the mixture to 0-7. The method for adsorbing chlorine dioxide according to claim 5, wherein the pH of the mixture is adjusted to be <5. The method for adsorbing chlorine dioxide according to claim 5 or 6, wherein the pH of the mixture is adjusted with hydrochloric acid, nitric acid or sulfuric acid. The method for adsorbing chlorine dioxide according to claim 1, wherein an aqueous chlorine dioxide solution having a concentration of 5 to 2,000 ppm is provided. The method for adsorbing chlorine dioxide according to claim 1, wherein the chlorine dioxide aqueous solution is added to the adsorbent dispersion while being stirred at a speed of 50 to 100 rpm. mix. The method for adsorbing chlorine dioxide according to claim 1, wherein the cerium oxide particles have a particle diameter of 2 nm to 10 μm. The method for adsorbing chlorine dioxide according to the first aspect of the invention, wherein the titanium dioxide particles have a particle diameter of 7 nm to 10 μm.