CN113215596A - System suitable for industrial production hypochlorous acid sterilized water - Google Patents
System suitable for industrial production hypochlorous acid sterilized water Download PDFInfo
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Abstract
The invention discloses a hypochlorous acid sterilized water production system suitable for industrial production, which comprises: a mixing device, saturated salt solution and pure water are mixed in the mixing device and then are input into a reaction tank, and hypochlorous acid disinfectant water is generated through electrolysis, the reaction tank comprises at least one diaphragm-free electrolytic cell, at least one anode and at least one cathode, and the reaction tank also comprises a device for current between the anode and the cathode, the current density supplied to the electrode is suitable for electrolyzing the sodium chloride electrolyte with certain concentration to generate the hypochlorous acid disinfectant water, and the hypochlorous acid disinfectant water is continuously output from the outlet of the reaction tank; the at least one anode is coated with an anode coating of RuO2-TiO2-PtO2-Nb2O 5. By controlling the concentration of the sodium chloride electrolyte and the flow rate of the mixing device, the utilization rate of the sodium chloride is fully improved, no wastewater is generated after electrolysis, the hypochlorous acid disinfectant can be continuously produced, and the hypochlorous acid disinfectant obtained by electrolysis is near neutral and can be stored for a long time.
Description
Technical Field
The invention relates to the technical field of chlorine-containing disinfectant fluid, in particular to a system suitable for industrially producing hypochlorous acid disinfectant fluid.
Background
Chlorine-containing disinfectants are those which dissolve in water to produce hypochlorous acid having microbiocidal activity, the microbiocidal active ingredient of which is often expressed as available chlorine. Sodium hypochlorite is the most common "chlorine" bleaching agent in household washing. Sodium hypochlorite has strong oxidizing property, and can be hydrolyzed to generate hypochlorous acid with strong oxidizing property, and can oxidize reducing substances to make microorganism lose function finally. Because of low cost and convenient use, the compound is widely recommended as an effective environment disinfection chemical in the world, but the oxidation potential of hypochlorous acid is low, so that the quick disinfection of staphylococcus aureus, bacillus subtilis and other bacteria cannot be realized, and higher concentration is needed in the use process, so that residual chlorine is easy to remain and harm to human bodies.
Hypochlorous acid is the most effective disinfectant in dilute chlorine-containing solutions, and because it is uncharged and has a relatively low molecular weight, it penetrates cell walls more rapidly than other chlorine-based disinfectants, and it undergoes oxidation reactions with organic matter (i.e., key components of microbial cells) more rapidly, thus, disinfection is more efficient. Unlike hypochlorite, which is used in high concentration, hypochlorous acid penetrates cell membranes and oxidizes proteins by attacking physiologically relevant molecules (ammonia, thioether, thiol, nucleotide, etc.) only in low concentration, thereby killing bacteria propagules, viruses, fungi, tubercle bacillus and bacterial spores. Under the same concentration, the disinfection efficiency of hypochlorous acid is 80-120 times higher than that of sodium hypochlorite.
And hypochlorous acid is a colorless and tasteless substance, is gaseous under normal environment, is harmless to human bodies, has high-efficiency sterilization effect at very low concentration after being dissolved in water, does not have pungent smell like sodium hypochlorite, is safe for children to contact, and does not need to be washed by clear water after being used because of no residue.
The production process of environment-friendly hypochlorous acid disinfectant fluid in the prior art generally adopts a method of electrolyzing saline solution or hydrochloric acid solution. Some of the results are as follows:
CN211972469 discloses a hypochlorous acid disinfectant generating system by an ion membrane electrolysis method, wherein a saturated saline solution electrolysis method is adopted to obtain hypochlorous acid disinfectant with high concentration in a short time, and the pH value of the obtained disinfectant is 2.5-3.5. The hypochlorous acid water obtained by the scheme belongs to strong-acid disinfectant fluid, but has the following defects: HCIO is stable under weak acidic conditions, and is easily changed into chlorine to escape under strong acidic conditions. Therefore, hypochlorous acid disinfectant water having a pH of 2.5 to 3.5 is unstable and its sterilizing ability is lowered within one week of storage.
CN111560622 discloses a generator for producing a high-concentration weak-acidic hypochlorous acid disinfectant with stable pH value, wherein the prepared hypochlorous acid disinfectant has stable property and pH of 4.5-6.5, and hydrochloric acid is used as a pH regulator in the electrolysis process to regulate the pH of the solution to weak acidity. Compared with strong acidic hypochlorous acid water, the stability of the weak acidic hypochlorous acid water is obviously improved, but the long-term storage can not be realized. On the other hand, hydrochloric acid has strong corrosivity and high volatility, so that a great potential safety hazard exists in the process of preparing dilute hydrochloric acid, and great inconvenience is brought to production.
CN111188052 discloses a preparation method of high-performance hypochlorous acid, which is implemented by passing chlorine-containing metal salts (sodium chloride and potassium chloride) with the mass concentration of 0.05-18% and water through an electrolysis device to obtain hypochlorous acid, wherein the effective chlorine concentration of the hypochlorous acid is 20-800 mg/L. Further disclosed is an electrolysis apparatus comprising an electrolysis cell comprising a ceramic nanofilm, an anode, a cathode, and a pretreatment of the anode of the electrolysis apparatus, the pretreatment composition comprising at least one of a metal oxide, graphene, carbon nanotubes, graphite. Wherein the metal oxide comprises SnO2、RuO2、IrO2、TiO2、Ta2O5、RuO2-SnO2-TiO2、IrO2-Ta2O5、RuO2-IrO2-SnO2、RuO2-IrO2-TiO2At least one of (1).
The cell of this application is diaphragm-type, i.e. the space in the cell is divided into two halves by ion-permeable membranes, and positive and negative electrodes are placed in the separate cells. Salt solution with certain concentration is injected into an electrolytic cell, the electrolyte generates electrochemical reaction through the current of a positive electrode and a negative electrode, strong acid water is generated at the positive electrode side, strong alkaline water is generated at the negative electrode side, and strong acid disinfectant water with low pH value (pH <3, high potential ORP >1100mY) and high available chlorine content (40.100 mg/L) can be prepared by a diaphragm electrolysis method, but the method has the following defects: firstly, the negative pole side produces strong alkaline water, and this strong alkaline water does not have bactericidal performance, generally all is abandoned, makes the utilization ratio loss 50% of running water: secondly, the electrolytic cell with the diaphragm has more complex structure, is easy to generate faults, and has high manufacturing and maintenance cost: thirdly, various chlorine-containing gases generated in the electrolytic process are easy to diffuse out, so that pungent peculiar smell is generated, and the environment is polluted: fourthly, chlorine-containing gas generated in the electrolysis process is not reused; fifthly, the electrolytic voltage is generally 8-20V, the power consumption is large, and the energy is wasted.
Disclosure of Invention
The invention provides a hypochlorous acid disinfectant fluid production system suitable for industrial production, wherein an electrolytic bath is diaphragm-free, the utilization rate of sodium chloride is fully improved by controlling the concentration of a sodium chloride electrolyte and the flow rate of a mixing device, no waste water is generated after electrolysis, hypochlorous acid disinfectant fluid can be continuously produced, and the electrolyzed hypochlorous acid disinfectant fluid is near neutral and can be stored for a long time.
The invention realizes the purpose through the following technical scheme:
a system for industrially producing hypochlorous acid-sterilized water, comprising: the mixing device comprises at least two inlets and an outlet, wherein the inlets are respectively used for inputting saturated saline water and pure water into the mixing device, the saturated saline water and the pure water are mixed in the mixing device and then output diluted sodium chloride electrolyte from the outlet, and the mixing device at least comprises a proportioner which is used for adjusting the proportion of the saturated saline water and the pure water according to the concentration required by the sodium chloride electrolyte; the reaction tank comprises a reaction tank inlet and a reaction tank outlet, the inlet of the reaction tank is connected with the outlet of the mixing device through a conveying pipeline, the sodium chloride electrolyte is input into the reaction tank from the mixing device and is electrolyzed to generate hypochlorous acid disinfectant water, and the reaction tank bagComprising at least one diaphragm-free electrolytic cell, at least one anode and at least one cathode, further comprising means for supplying an electric current between said anode and said cathode, the current density supplied to said electrodes being adapted to electrolyze said sodium chloride electrolyte at a concentration suitable to generate hypochlorous acid sterilizing water, said hypochlorous acid sterilizing water being continuously output from said reaction tank outlet; the at least one anode is coated with RuO2-TiO2-PtO2-Nb2O5And (4) coating the anode.
Further, the pH value of the hypochlorous acid disinfectant fluid is 6.0-8.0.
Furthermore, the concentration of the hypochlorous acid disinfectant fluid is 50-500 ppm.
Further, the flow rate of the saturated brine and the pure water is controlled by the proportioner to obtain a brine electrolyte with a concentration of 1.5 to 1.8%, the flow rate of the brine electrolyte to be fed into the reaction tank is 1.0 to 2.0L/min, and the current density is 100 to 120mA/cm2。
Further, the flow rates of the saturated brine and pure water were controlled by the proportioner to obtain a 1.5% brine electrolyte, the flow rate of the brine electrolyte fed into the reaction tank was 1.8L/min, and the current density was 110mA/cm2。
Further, the RuO2-TiO2-PtO2-Nb2O5In the anode coating, the mass fraction of Pt is 10-20%, the mass fraction of Nb is 5-10%, the mass fraction of Ru is 20-30%, and the mass fraction of Ti is 30-60%.
Further, the RuO2-TiO2-PtO2-Nb2O5In the anode coating, the mass fraction of Pt is 10%, the mass fraction of Nb is 5%, the mass fraction of Ru is 30%, and the mass fraction of Ti is 55%.
The main reaction equation for producing hypochlorous acid water by brine electrolysis is as follows:
anode: cl-→1/2Cl2+e-
Cl2+H2O→ HClO+H++Cl-
Cathode: h++e-→1/2H2
In addition, there are some side reactions, such as electrolysis of water at the anode to produce H+And O2ClO of cathode-Reacts with water to form OH-And Cl-In solution of ClO-And HClO, and the like.
In the application, the electrolytic cell is diaphragm-free, the anode is used for chlorine evolution reaction, namely chlorine molecules are formed after chlorine ions lose electrons, and meanwhile, hypochlorous acid and chlorine ions and a small part of chlorate ions are generated after the chlorine reacts with water. Meanwhile, after water molecules at the anode are electrolyzed, oxygen is separated out, the oxygen evolution reaction is a side reaction, the oxygen evolution reaction is avoided as much as possible, sodium chloride is a strong electrolyte, water is a weak electrolyte, the chlorine evolution reaction is dominant in the competition of the chlorine evolution reaction and the oxygen evolution reaction, but when the concentration of a sodium chloride electrolyte is too low, ionized chloride ions cannot meet the electrolysis speed of an electrolytic cell, so that water electrolysis is started, oxygen is separated out, and meanwhile, hydrogen ions in the electrolyte are excessive, the pH value of the electrolyte is too low, and the ClO is caused by the too low pH value-Reacting with HClO to generate chlorine gas, and volatilizing the chlorine gas. Chloride ions and chlorate ions generated at the anode all migrate towards the anode direction, and the chlorate ions react in the process of diffusing towards the anode direction and migrating:
ClO-+H+=HClO
if ClO is present-And HClO diffuses to the cathode and is consumed, but ClO-And HClO concentrations are relatively low, diffusion to the cathode is limited and membrane problems are not considered. Avoiding too low a pH at the interface of the electrolyte anode and cathode, due to ClO-And HClO is easy to generate chlorine gas under the acidic condition and volatilize. The cathode is a hydrogen evolution reaction, the electrolyte is alkalized after electrolysis, when the electrolysis is started, a certain pH gradient exists between the anode and the cathode, the electrolyte starts to be acidic, the sodium chloride is fully electrolyzed by controlling the concentration of the sodium chloride and the electrolysis voltage, and the electrolyte is in a neutral vicinity after products of the anode and the cathode are neutralized.
Hypochlorous acid is stable under the weak acidic condition and is neutralIs most stable, and easily becomes chlorine gas to escape under strong acid condition, and exists in the form of sodium hypochlorite under alkaline condition. The electrode is improved, so that the surface of the anode has strong attraction to chlorine, the generation of chlorine evolution reaction is facilitated, the occurrence of side reaction is reduced, and the content of effective chlorine is improved. Available chlorine is chlorine (ClO) having strong oxidizing property in the process of electrolyzing saline solution-、HClO、C12) The total of the above components, the effective chlorine content is high, and the yield of hypochlorous acid water is improved under the action of the electrode. The current efficiency is an important index for measuring the performance of the anode, and is the ratio of the actual generation amount of the available chlorine to the theoretical generation amount in the electrolysis process. Besides the required chlorine evolution reaction, the anode also has a plurality of oxygen evolution side reactions. These side reactions result in the actual production of less than the theoretical amount of available chlorine. Therefore, it is important to reduce side reactions by improving the performance of the electrode. On the other hand, the concentration, flow rate and current density of the salt solution are adjusted to ensure that the sodium chloride fully reacts, and the electrolyte is in a neutral and nearby environment, which is also beneficial to the stability of HClO.
The application adopts a quaternary metal oxide anode coating to prepare the quaternary oxide coating RuO2-TiO2-PtO2-Nb2O5The Pt and the Nb are added in the traditional Ru and Ti anode coating, the stability of the anode can be effectively enhanced by the Nb, the catalytic performance of the anode can be effectively enhanced by the Pt, the four components can be well mixed, the synergistic effect of the metal oxide can be fully exerted, different oxides can exert respective electrochemical performance, and the anode has excellent chlorine-oxygen selectivity.
RuO prepared according to a certain proportion2-TiO2-PtO2-Nb2O5The anode coating is prepared by uniformly coating an anode coating liquid on a corresponding pretreated titanium substrate by using a soft brush at room temperature, drying for 5-10 min in a drying oven at 60-90 ℃, thermally decomposing for 5-10 min in a muffle furnace at 400-500 ℃ after drying, taking out and cooling at room temperature. Repeating the above processes, namely uniformly coating the anode coating liquid on the titanium substrate by using a soft brush, drying, thermally decomposing, repeating the above processes for 15-20 times, and standingThe loading of the coating to the oxide reaches 2.0-3.0 mg.cm-2。
In the anode coating, the mass fraction of Pt is 10-20%, the mass fraction of Nb is 5-10%, the mass fraction of Ru is 20-30%, and the mass fraction of Ti is 30-60%.
Compared with the prior art, the invention has the following beneficial effects:
1. the hypochlorous acid disinfectant fluid produced by the application has the characteristics of convenience in use and green safety, and has safety for users and the environment because the concentration of the hypochlorous acid is low. And the prepared hypochlorous acid solution has high stability because the pH is close to neutral.
2. The method takes the salt water as the raw material, generates hypochlorous acid water through electrolysis, and produces sodium chloride and water as the sterilized products, thereby having no pollution to human bodies and the environment and being healthy and environment-friendly.
3. In the reaction tank, the residence time of the electrolyte in the reaction tank can be controlled according to the flow rate of the input sodium chloride electrolyte, the hypochlorous acid disinfectant with the concentration of 50-500 ppm is obtained by electrolysis under different electrolysis time and voltage, and the hypochlorous acid disinfectant with different concentrations can be prepared according to different occasions in actual use.
4. The pH value of the hypochlorous acid disinfectant fluid produced by the application is 6.0-8.0, the hypochlorous acid disinfectant fluid is sealed and stored for 4 months under the condition of normal temperature, and the effective chlorine of the hypochlorous acid disinfectant fluid is reduced by no more than 5%.
5. The application adopts the quaternary metal oxide anode coating, fully exerts the synergistic effect of the metal oxide, ensures that different oxides exert respective electrochemical properties, and ensures that the anode has excellent chlorine-oxygen selectivity.
Detailed Description
The invention is further illustrated below:
a system suitable for industrially producing hypochlorous acid disinfectant fluid comprises a mixing device and a reaction tank, wherein the mixing device comprises two inlets, one inlet is used for inputting saturated salt solution into the mixing device, the other inlet is used for inputting pure water into the mixing device, the mixing device at least comprises a proportioner, the proportion of the saturated salt solution and the pure water is adjusted according to the concentration required by sodium chloride electrolyte, and the saturated salt solution and the pure water are input into the reaction tank for electrolysis after being fully mixed in the mixing device.
The reaction tank comprises a reaction tank inlet and a reaction tank outlet, the inlet of the reaction tank is connected with the outlet of the mixing device through a conveying pipeline, sodium chloride electrolyte is input into the reaction tank from the mixing device and electrolyzed to generate hypochlorous acid disinfectant, the reaction tank comprises at least one diaphragm-free electrolytic cell, at least one anode and at least one cathode, and further comprises equipment for maintaining voltage between the anode and the cathode, wherein the voltage is suitable for electrolyzing the sodium chloride electrolyte with certain concentration to generate the hypochlorous acid disinfectant with the sub-pH value of 6.0-8.0, and the hypochlorous acid disinfectant is continuously output from the reaction tank outlet.
Wherein the anode adopts quaternary metal oxide RuO2-TiO2-PtO2-Nb2O5The anode coating comprises 10% of Pt, 5% of Nb, 30% of Ru and 55% of Ti by mass, the anode coating liquid is uniformly coated on a corresponding pretreated titanium substrate by a soft brush at room temperature, the titanium substrate is dried in a drying oven for 5min at the drying temperature of 60 ℃, and is thermally decomposed in a muffle furnace at the temperature of 400 ℃ for 10min after being dried, and the titanium substrate is taken out and cooled at room temperature. Repeating the above processes, namely uniformly coating the anode coating liquid on the titanium substrate by using a soft brush, drying, thermally decomposing, and repeating the above processes for 20 times until the coating capacity of the oxide reaches 2.0-3.0 mg.cm-2。
Since the solubility of sodium chloride was 35.8g at 10 ℃, 36.0g at 20 ℃, 36.3g at 30 ℃ and 36.6g at 40 ℃, the concentration of the saturated saline solution was not significantly affected by the temperature. Taking 20 ℃ as an example, the concentration of the saturated saline solution is 36/(100+36) =26.47%, and if the concentration of 136g of saline solution is diluted to 1.5%, 2400g of pure water needs to be added, so that the flow ratio of the clear water to the saturated saline solution is 23: 1. that is, the flow ratio of the clear water to the saturated brine is controlled by the proportioner to be 23: 1, obtaining the sodium chloride aqueous electrolyte with the concentration of 1.5 percent.
Example 1
Preparing saturated salt solution, and controlling the flow rates of the saturated salt solution and the pure water to be 23: 1, obtaining 1.5% of sodium chloride aqueous electrolyte, feeding the sodium chloride aqueous electrolyte into a reaction tank from a mixing device for electrolysis, wherein the flow rate of feeding the sodium chloride aqueous electrolyte into the reaction tank is 1.8L/min, and when the reaction tank is filled with the electrolyte, starting electrolysis. At this time, the inflow rate and the outflow rate were matched, the outflow rate of the electrolyte was also 1.8L/min, and the current density was 110mA/cm2The effluent hypochlorous acid sterilized water had a HClO concentration of 100ppm and a pH of 6.9, and the residual amount of sodium chloride in the hypochlorous acid sterilized water was measured to be 0.45%, and the ratio of the concentration of the precipitated chlorine to the concentration of chlorine in the electrolyte, i.e., the chlorine precipitation efficiency, was 70%.
Example 2
Controlling the flow rates of the saturated brine and the pure water by a proportioner to obtain brine electrolytes with different concentrations, inputting the brine electrolytes into a reaction tank from a mixing device for electrolysis, wherein the flow rate of inputting the brine electrolytes into the reaction tank is 1.8L/min, and starting electrolysis after the reaction tank is filled with the brine electrolytes. At this time, the inflow rate and the outflow rate were matched, the outflow rate of the electrolyte was also 1.8L/min, and the current density was 110mA/cm2The effluent hypochlorous acid disinfectant fluid was measured for the concentration of HClO, pH and residual amount of sodium chloride in hypochlorous acid disinfectant fluid, and the following results were obtained as shown in Table 1:
as can be seen from the above table, when the concentration of the saline solution is less than 1.0, the concentration of the obtained sterilized water is less than 6.8, and the sterilized water is slightly acidic. The HClO concentration obtained at the same flow rate is also low, but the current efficiency is relatively high, and it is possible that sodium chloride is substantially electrolyzed and the amount of sodium chloride is insufficient, so that the oxygen evolution side reaction of the electrolyzed water is increased and the solution is weakly acidic. When the sterilized water is near neutral, the stability is improved. Therefore, the flow rate of the electrolyte was also 1.8L/min, and the current density was 110mA/cm2In this case, the concentration of the saline solution is preferably 1.4 to 1.8%.
Example 3
Controlling the flow of the saturated saline and the pure water by a proportioner to obtain a saline solution with the concentration of 1.5%, inputting the saline solution into a reaction tank from a mixing device for electrolysis, examining the influence of different flow rates of the saline solution input into the reaction tank on the performance of the sterilized water, and starting electrolysis after the reaction tank is filled with the electrolyte. At this time, the inflow rate and the outflow rate were the same, and the current density was 110mA/cm2The effluent hypochlorous acid disinfectant fluid was measured for the concentration of HClO, pH and residual amount of sodium chloride in hypochlorous acid disinfectant fluid, and the following results were obtained as shown in Table 1:
from the above table, it is known that when the flow rate of the electrolyte fed into the reaction tank is too low, the pH of the sterilized water is low, which is equivalent to the concentration of sodium chloride in the electrolyte is low, and the oxygen evolution side reaction is increased. Also, when the flow rate of the electrolyte is less than 1.0L/min, the concentration of HClO in the sterilized water increases slowly, and since sodium chloride is substantially electrolyzed, decreasing the flow rate does not effectively increase the concentration of HClO. When the flow rate is more than 2.1L/min, the residence time in the re-reaction tank is short, the electrolysis time is short, the residual sodium chloride is more and the concentration of HClO in the sterilized water is low under the relative volume. Therefore, under the conditions of the present embodiment, the flow rate is preferably 1.2 to 1.8L/min.
Example 4
The flow rate of the saturated brine and pure water was controlled by a proportioner to obtain a 1.5% brine electrolyte, the brine electrolyte was fed from a mixing device into a reaction tank to conduct electrolysis, the flow rate of the brine electrolyte fed into the reaction tank was 1.8L/min, and electrolysis was started after the reaction tank was filled with the electrolyte. At this time, the inflow rate and the outflow rate were the same, and the concentration of HClO, pH and the residual amount of sodium chloride in the hypochlorous acid disinfectant water were measured at different current densities, and the following results were obtained as shown in Table 1:
from the above table, it can be seen that when the current density is less than 100mA/cm2In the case of the method, although the sterilized water is nearly neutral, the content of hypochlorous acid in the sterilized water is low, the amount of residual sodium chloride in the sterilized water is large, and the yield is low. When the current density is more than 120mA/cm2When the current density is too high, the oxygen evolution side reaction increases, resulting in weak acidity of the sterilized water.
Therefore, each performance parameter of the sterilized water is related to the concentration of sodium chloride in the electrolyte, the concentration of sodium chloride input into the reaction tank and the current density. When the flow rate is increased, the current density can be properly increased to ensure that the sterilized water has higher yield and can be kept near neutral. When the concentration of the sodium chloride is increased, the flow rate can be reduced, or the current density can be increased, so that the sterilized water has higher yield and can be kept near neutral.
Example 5
Preparing saturated saline solution, controlling the flow rate of saturated saline solution and pure water by a proportioner to obtain 3.0% saline solution, feeding the saline solution from a mixing device into a reaction tank for electrolysis, wherein the flow rate of the saline solution fed into the reaction tank is 1.0L/min, and when the reaction tank is filled with the electrolyte, starting electrolysis. At this time, the inflow rate and the outflow rate were matched, the outflow rate of the electrolyte was also 1.0L/min, and the current density was 110mA/cm2The effluent hypochlorous acid sterilized water had a HClO concentration of 105ppm, a pH of 7.0, a residual amount of sodium chloride in the hypochlorous acid sterilized water of 0.34%, and a ratio of the concentration of the precipitated chlorine to the concentration of chlorine in the electrolyte, i.e., a chlorine precipitation efficiency of 77.3%.
Example 6
Preparing saturated saline solution, controlling flow rate of saturated saline solution and pure water by a proportioner to obtain 1.5% saline solution, feeding the saline solution from a mixing device into a reaction tank for electrolysis, and feeding the saline solution into the reaction tank at a flow rate of 4.0And L/min, and when the reaction tank is filled with the electrolyte, starting electrolysis. At this time, the flow rate of the electrolyte was also 4.0L/min, and the current density was 210mA/cm2The effluent hypochlorous acid sterilized water had a HClO concentration of 109ppm, a pH of 7.0, a residual amount of sodium chloride of 0.31% in the hypochlorous acid sterilized water, and a ratio of the concentration of the precipitated chlorine to the concentration of chlorine in the electrolyte, i.e., a chlorine precipitation efficiency of 79.3%.
The stability of hypochlorous acid disinfectant water differs at different pH values, and hypochlorous acid, which is a main bactericidal factor, is theoretically more stable as the acidity is weaker, but is present as sodium hypochlorite under alkaline conditions, and the bactericidal effect of sodium hypochlorite is far inferior to that of hypochlorous acid, so that the stability of hypochlorous acid aqueous solution is determined to be affected by pH under the consideration of pH as stability.
Under the condition of the same effective rate, hypochlorous acid disinfectant water with different pH values is taken and is stored in a brown bottle in a sealing way for 40 days, and the result shows that the effective chlorine of the hypochlorous acid disinfectant water with the pH value of 2.5 is almost zero, the effective chlorine can be stored for 93 percent when the hypochlorous acid disinfectant water is stored under the condition of the pH value of 6.5, the effective chlorine can be stored for 98 percent when the hypochlorous acid disinfectant water is stored under the condition of the pH value of 6.8, and the effective chlorine of the hypochlorous acid disinfectant water with the pH value of 7 can be stored for 99 percent. The storage was carried out for 80 days, and the results showed that the available chlorine was 88% when the sample was stored at pH 6.5, 91% when the sample was stored at pH 6.8, and 98% when the sample was stored at pH 7. The storage time was 120 days, and the results showed that 62% of available chlorine was stored at pH 6.5, 74% of available chlorine was stored at pH 6.8, and 96% of available chlorine was stored in the pH 7 hypochlorite solution.
Thus, the closer the pH of the hypochlorite water is to neutral, the better the stability. This application is through the improvement to the positive pole, can effectively improve stability, reduces the side reaction to through the concentration of adjusting electrolyte, velocity of flow and current density isoparametric, can make the hypochlorous acid sterile water that produces keep near neutral, improved the stability of hypochlorous acid sterile water greatly.
On the other hand, the method can produce the disinfectant fluid of hypochlorous acid with different concentrations by controlling various parameters, is applied to different disinfection occasions, for example, 50ppm is suitable for food processing industry, such as tools, containers, appliances and the like used in production, soaks the tools for about-10 minutes, and can reach the sterile state without cleaning. The worker can sterilize the work clothes and hands and directly spray the product on the surface of the clothes and the hands. Also can be used for toilet disinfection, clothing disinfection, environment and floor disinfection, daily article disinfection, fruit and vegetable disinfection, etc. 50-100 ppm can also be used in the field of agricultural planting, such as sterilization treatment of crops, replacement of the insecticidal and anthelmintic effects of part of pesticides, reduction of the usage amount of pesticides and fertilizers in the planting process, no chemical residue, and reduction of health risks to farmers. 150-200 ppm can be used for garbage deodorization and the like. 500ppm has strong effects of removing mildew and bacteria. Therefore, the production system of hypochlorous acid sterile water of this application has the range of application extensively, and production is convenient, advantage that productivity is high.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. A system for industrially producing hypochlorous acid disinfectant fluid, comprising:
the mixing device comprises at least two inlets and an outlet, wherein the inlets are respectively used for inputting saturated saline water and pure water into the mixing device, the saturated saline water and the pure water are mixed in the mixing device and then output diluted sodium chloride electrolyte from the outlet, and the mixing device at least comprises a proportioner which is used for adjusting the proportion of the saturated saline water and the pure water according to the concentration required by the sodium chloride electrolyte;
a reaction tank comprising a reaction tank inlet and a reaction tank outlet, the inlet of the reaction tank being connected to the outlet of the mixing device via a delivery conduit, the sodium chloride electrolyte being fed from the mixing device into the reaction tank and being electrolysed to produce hypochlorous acid disinfectant, the reaction tank comprising at least one non-diaphragm electrolytic cell, at least one anode and at least one cathode, and means for applying a current between the anode and the cathode, the current density supplied to the electrodes being suitable for electrolysed production of a concentration of the sodium chloride electrolyte to produce hypochlorous acid disinfectant, the hypochlorous acid disinfectant being continuously output from the reaction tank outlet;
at least one of the anodes is coated with RuO2-TiO2-PtO2-Nb2O5And (4) coating the anode.
2. The system for industrially producing hypochlorous acid disinfectant fluid according to claim 1, wherein the pH of the hypochlorous acid disinfectant fluid is 6.0 to 8.0.
3. The system for industrially producing hypochlorous acid disinfectant fluid according to claim 2, wherein the concentration of hypochlorous acid disinfectant fluid is 50 to 500 ppm.
4. The system of claim 3, wherein the flow rate of the saturated brine and the flow rate of the pure water are controlled by the proportioner to obtain a brine electrolyte with a concentration of 1.5 to 1.8%, the flow rate of the brine electrolyte to the reaction tank is 1.0 to 2.0L/min, and the current density is 100 to 120mA/cm2。
5. The system according to claim 4, wherein the flow rates of the saturated brine and the pure water are controlled by the proportioner to obtain a 1.5% brine solution, the flow rate of the brine solution fed into the reaction tank is 1.8L/min, and the current density is 110mA/cm2。
6. The system for industrial production of hypochlorous acid disinfectant fluid according to claim 1, wherein said RuO is a chemical solution of hypochlorous acid2-TiO2-PtO2-Nb2O5In the anode coating, the mass fraction of Pt is 10-20%, the mass fraction of Nb is 5-10%, the mass fraction of Ru is 20-30%, and the mass fraction of Ti is 30-60%.
7. The system for industrial production of hypochlorous acid disinfectant fluid according to claim 6, wherein said RuO is a chemical solution of hypochlorous acid2-TiO2-PtO2-Nb2O5In the anode coating, the mass fraction of Pt is 10%, the mass fraction of Nb is 5%, the mass fraction of Ru is 30%, and the mass fraction of Ti is 55%.
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