Why is the concentration of slightly acidic hypochlorous acid disinfectant lower than that of ordinary chlorine-containing disinfectants?
Chlorine-containing disinfectant: a disinfectant that can produce hypochlorous acid when dissolved in water.
The hypochlorous acid released by 2000ppm sodium hypochlorite is about 4-40ppm (the amount released varies according to different conditions), and its main component is not hypochlorous acid.
Hypochlorous acid disinfectant: The original disinfectant solution contains stable hypochlorous acid.
The hypochlorous acid contained in 50-80ppm hypochlorous acid disinfectant is 50-80ppm, and there is no need for a reaction release process.
Statement:
The pH of hypochlorous acid disinfectant is ≤7. The best sterilization effect is when pH=5, but the safest pH range for long-term use is 6.20~6.80 between.
Chlorine-containing disinfectants with pH>7 are not hypochlorous acid disinfectants.
The higher the concentration of hypochlorous acid, the more unstable it is. Hypochlorous acid solution with an effective chlorine concentration ≥100ppm is unstable and difficult to store, so it is suitable for immediate use. Therefore, high-concentration hypochlorous acid disinfectant is easy to obtain, but low-concentration is rare. The most valuable thing is the low concentration.
Research shows that under the same test conditions, the bactericidal ability of hypochlorous acid in the form of molecules in the solution is 80-100 times that of sodium hypochlorite.
Most of the chlorine-containing disinfectants on the market are sodium hypochlorite disinfectants. Sodium hypochlorite can produce trace amounts of hypochlorous acid when dissolved in water, and the main component of disinfection is these trace amounts of hypochlorous acid. The hypochlorous acid content released after the reaction of sodium hypochlorite disinfectant is very low. When the pH is 10.0, the hypochlorous acid content released is only 0.26%). The higher the alkalinity, the lower the released content. To achieve the same disinfection effect, a high concentration is required. Dosage is used, thus resulting in chemical residues, irritation and corrosiveness.
The relationship between available chlorine content, hypochlorous acid content and bactericidal ability
Available chlorine refers to the oxidized chlorine contained in chlorine-containing compounds. Oxidized chlorine can release its oxidizing property during the redox reaction and be reduced to the natural stable state of reduced chlorine with a valence of -1. This reaction process can be exploited, such as 84 and bleaching powder for bleaching, disinfection, etc. Therefore, these oxidized chlorine is the chlorine that can exert its effect. As the name suggests, it is called effective chlorine.
Hypochlorite (ClO-_) and hypochlorous acid (HCIO) are both available chlorine, but their antivirus principles are completely different.
Hypochlorous acid makes chlorine-containing disinfectants present themselves in their most essential form, which is equivalent to extracting the core active ingredients of ordinary chlorine-containing disinfectants and discarding other redundant and ineffective ingredients. The concentration of the disinfectant Can be greatly reduced, no residue, no bleaching, no corrosion, no irritation. Curve chart of the relationship between the existence form of chlorine and the pH of the solution
Why is hypochlorous acid more expensive than ordinary chlorine-containing disinfectants?
Because hypochlorous acid itself is unstable, it will react quickly with organic matter. Therefore, the entire production of hypochlorous acid disinfectant has very high process requirements. There are strict standards for water treatment process, generation process, storage process and filling process, and quality requirements for container and packaging materials. This is hypochlorous acid disinfection. The main reason why the agent is higher than other chlorine-containing disinfectants.
3. Why are the prices of non-electrolytic slightly acidic hypochlorous acid and hypochlorous acid produced by other methods so different?
To put it simply, take a car as an analogy. Under the premise of the same displacement and weight, the lower the fuel consumption, the more environmentally friendly, the higher the technical content, and the more expensive the price.
The concentration of hypochlorous acid produced by electrolysis and mixing methods is generally higher than that of non-electrolytic slightly acidic hypochlorous acid disinfectants. This is because hypochlorous acid disinfectants produced by other methods are generally made for immediate use. , the warranty period is very short, and it is difficult to store it stably for a long time without adding stabilizers. In particular, electrolyzed water requires sufficient conductivity. The purer the water, the less conductive it is. Therefore, a large amount of electrolyte components need to be added, which affects the stability and safety of the product. Laboratory studies have shown that under the same storage conditions, if stored for more than 3 months, the effective chlorine in disinfectants from other processes will naturally attenuate and the effective disinfection effect will not be achieved. Therefore, in the disinfectant industry, hypochlorous acid disinfectants from other processes that want to achieve a one-year warranty period need to increase the concentration to 100ppm or even higher, such as 250ppm or above, in order to offset the natural attenuation of effective chlorine during the warranty period, thereby Achieve the established disinfection effect.
Non-electrolytic slightly acidic hypochlorous acid disinfectant, on the contrary, the purer the water quality, the better, the water quality requirements are extremely high, ordinary tap water cannot meet the production requirements, RO pure water needs to be used, and The production process is special. During the production and operation of the equipment, the allowed range of pH value is accurately and intelligently controlled between 6.20 and 6.80. It automatically stops when it exceeds the range. The generated value is set to a narrow range of median 6.50±0.05, so the product stability is high. In a light-proof and sealed storage environment, the warranty period can be as long as 18 months, and the effective chlorine content is guaranteed to be sufficient to achieve the disinfection and sterilization effect, while ensuring the safety of the product.
From this we can know that under the premise of the same sterilization effect and the same storage method, the lower the concentration of the disinfectant and the longer the warranty period, the more advanced the production process is and the environmental impact it has. The smaller the burden, the higher the price.
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