Sodium Dichloroisocyanurate Powder CAS 2893-78-9

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Sodium dichloroisocyanurate powder (DCCNa) is an organic compound, abbreviated as SDIC. White molecular formula C3Cl2N3NaO3, CAS 2893-78-9. At room temperature, it appears as white powder crystals or granules with a chlorine odor. It is easily soluble in water and difficult to dissolve in organic solvents. It is a commonly used disinfectant that has strong oxidizing and killing effects on pathogenic microorganisms such as viruses, bacterial spores, and fungi. It is a widely used and highly efficient fungicide. Strong sterilization and disinfection ability, the effective chlorine content of pure DCCNa is 64.5%, and the effective chlorine content of high-quality products is greater than 60%, with strong disinfection and sterilization effects. At 20ppm, the sterilization rate reaches 99%. It has a strong killing effect on various bacteria, algae, fungi, and pathogens.

DCCNa is an efficient disinfectant with high solubility in water, long-lasting antiviral ability, and low toxicity, so it is widely used as a disinfectant for drinking water and household use. DCCNa can hydrolyze hypochlorous acid in water and can replace hypochlorous acid in some situations, so it can be used as a bleaching agent. And because DCCNa can be produced on a large scale and has a lower price, it is widely used in many industries:

Wool anti shrink treatment agent

 

Sodium dichloroisocyanurate powder can uniformly release hypochlorous acid in aqueous solution, which interacts with protein molecules in the wool cuticle layer, breaking some bonds in their protein molecules and causing changes in their molecular structure to prevent wool shrinkage. In addition, DCCNa can be added to detergents such as laundry detergent to effectively prevent wool adhesion, pilling, and other phenomena when washing wool products. The wool fabric treated with DCCNa has bright color, good hand feel, and basically no shrinkage; Adding 2%~3% DCCNa solution to wool or wool blend fibers and fabric impregnation treatment aids can effectively prevent the occurrence of pilling, felting, and other phenomena in wool and its products.

Textile industry bleaching

 

DCCNa is also widely used as a bleaching agent for natural and synthetic fibers in the textile industry. The principle of bleaching is to destroy the pigments in natural fibers and synthetic fibers. DCCNa can uniformly release hypochlorous acid in aqueous solution. Hypochloric acid can react with some chromophores in fibers through addition reactions with its conjugated bonds, destroying the original pigments in the fibers and changing the wavelength of light absorption, thereby achieving the purpose of bleaching. Compared to using traditional bleaching agents, DCCNa has significant advantages. Traditional bleaching agents can only be used at lower temperatures because under high temperature conditions, the speed at which traditional bleaching agents destroy the molecular structure of fibers will accelerate, and the strength of fibers will rapidly decrease under their influence.

 

DCCNa can still achieve good bleaching effect even at lower temperatures; In addition, DCCNa has a slower rate of damage to the molecular structure of natural and synthetic fibers, a better bleaching effect, and the strength of the fibers will not be greatly affected. In addition, adding DCCNa to bleach can improve the hydrophilicity of clothing, remove cotton pulp from clothing, and reduce the degradation rate of cellulose, while also improving the flexibility and extensibility of clothing.

Sterilization and disinfection of aquaculture industry

 

(1) If there is some negligence in sterilization and disinfection during silkworm breeding, bacteria and pests can cause damage to the silkworms, and even lead to their death. Using DCCNa as the main ingredient, adding an appropriate amount of stabilizer and promoter, the three are evenly mixed to form a disinfectant solution, which can quickly kill viruses, fungi, and bacteria that affect silkworms and their living environment. DCCNa aqueous solution can be sprayed on the silkworm room, silkworm equipment, and silkworm body to prevent and treat silkworm diseases while killing gastrointestinal pyogenic polyhedra, gastrointestinal pyogenic virus, and blood type pyogenic polyhedra. Compared with traditional silkworm disinfectants, disinfectants mainly composed of DCCNa have higher solubility, more stability, and longer duration of efficacy. As an excellent disinfectant for the development of sericulture, DCCNa has almost no effect on the growth and quality of silkworms.

 

(2) DCCNa has also shown remarkable performance in the sterilization and disinfection of aquaculture in preventing and controlling fish diseases. It can quickly kill bacteria, fungi and other microorganisms in water bodies, and also prevent and treat viral diseases in fish. So DCCNa is often used for disinfecting aquatic products such as fish, shrimp, crabs, frogs, etc. It also has certain applications in fish species disinfection and fish equipment disinfection. The disinfection effect of sodium dichloroisocyanurate on drinking water: After disinfection of drinking water, the survival rate of chickens is about 97%, while the average survival rate of chickens without disinfection of drinking water is 90.07%, which is nearly 7 percentage points higher. Drinking water disinfected with sodium dichloroisocyanurate is of great benefit to the health of chickens, greatly improving their survival rate and naturally increasing economic benefits.

Civil hygiene disinfection

 

(1) Adding an appropriate amount of DCCNa to household dishwashing detergent and other cleaning products can enhance the function of the detergent, allowing it to play a role in antivirus and sterilization. The effect is very significant when cleaning stains containing protein and juice. 600mg of sodium dichloroisocyanurate powder can be weighed and added to 1L of water. After soaking and disinfecting the tableware in water for 2 minutes, 100% of Escherichia coli can be killed. After soaking and disinfecting for 8 minutes, the survival rate of Bacillus subtilis decreases to only 2%. After soaking and disinfecting for 15 minutes, the hepatitis B virus can be completely killed. In addition, DCCNa is widely used in the disinfection of agricultural products such as fruits, vegetables, poultry, and eggs, and is a commonly used additive in refrigerator disinfectants and bathroom deodorizers.

 

(2) Disinfection of swimming pool water
The water in the swimming pool is very suitable for the reproduction of bacteria and other microorganisms. If not disinfected regularly, algae and other microorganisms will rapidly grow, causing the pool water to emit a nauseating odor and adhere to the pool walls, forming a slippery and dirty layer of dirt. Encountering these dirt while swimming can cause swimmers to develop a sense of disgust, while also infecting their skin, and even their eyes, respiratory tract, and respiratory organs. Adding an appropriate amount of DCCNa disinfectant tablets to the swimming pool water can not only keep the water clear and shiny, but also keep the pool walls clean, remove adhered substances, and make swimmers physically and mentally happy.

 

 

DCCNa disinfectant tablets have good bactericidal effect at the usage concentration and have little harm to the human body.

(3) Disinfection of drinking water
Adding an appropriate amount of DCCNa to drinking water can quickly kill various bacteria, viruses, and microorganisms. Not only that, DCCNa can also destroy pollutant molecules such as hydrogen sulfide in water, eliminating their color and odor. DCCNa has a significant killing effect on inflammatory viruses and Escherichia coli. Adding 10mg of DCCNa per liter of water results in a survival rate of 0.01% for Escherichia coli in water.

Industrial circulating water treatment

 

Many thermal power plants, oil refineries, and chemical plants generate a large amount of heat during the production process. These heats require a large amount of cooling water to be treated. In general, these industries use heat exchange equipment such as heat exchangers, condensers, circulation pipelines, cooling towers, pump systems, etc. However, algae in these heat exchange devices are very prone to reproduction, leading to the growth of a large amount of dirt. The use of fungicides can effectively treat algae in cooling water, among which DCCNa is a commonly used cooling water fungicide. DCCNa can efficiently inhibit the proliferation of algae and microorganisms in cooling water, and has little erosion on industrial equipment, which can maintain good water quality in the circulating water system for a long time. Therefore, DCCNa is an important component of industrial cooling water treatment agents.

Cleaning and disinfection of food industry and public places

 

Food processing industries such as dairy processing plants, breweries, and other beverage factories have also begun to extensively use DCCNa for cleaning and disinfection. Mainly used for disinfection and sterilization of processing equipment such as containers, pipelines, tools, and sites. Some catering industries such as cold drink shops, tea houses, restaurants, etc. also often use DCCNa to disinfect and sanitize tableware such as trays, bowls, tablecloths, and hand towels. Using DCCNa can maintain the hygiene of tableware and food processing equipment, eliminate stains, mold, odors, etc. caused by proteins, maintain the luster of tableware, and prevent the transmission of diseases.

The raw materials for the production of Sodium Dichloroisocyanurate Powder are mainly cyanuric acid, caustic soda and chlorine gas. The production methods mainly include dichloroisocyanuric acid method, sodium hypochlorite method and trichloroisocyanuric acid compound decomposition.

The cyanuric acid and caustic soda are prepared into disodium cyanuric acid salt in a ratio of 1:2 (molar ratio), and chlorine gas is introduced for chlorination to generate dichloroisocyanuric acid slurry. The wet dichloroisocyanuric acid is obtained by centrifugation; Then put it into the mother liquor of product, add caustic soda at a ratio of 1:1 (molar ratio) to neutralize, cool, crystallize and filter after reaction to obtain wet product, and dry to obtain it or its dihydrate product.

advantage:

(1) It can realize the co production of dichloroisocyanuric acid and sodium dichloroisocyanurate, among which dichloroisocyanuric acid is also an important variety of chloroisocyanuric acid products, which can be used as a disinfectant.

(2) The product quality is high. As the solubility of dichloroisocyanuric acid in water is only 0.7%, the sodium chloride generated in the reaction can be basically washed clean, and no other impurities are generated in the neutralization reaction, so the product has high purity and low salt content;

(3) Low raw material consumption.

Disadvantages:

(1) Dichloroisocyanuric acid is highly corrosive, which requires high anti-corrosion of reaction kettle and centrifugal equipment, and the equipment investment is relatively large;

(2) Chlorinated tail gas absorbs more sodium hypochlorite by-products.

As this process can consume a large amount of sodium hypochlorite solution, it can be used in chlor alkali plants with a large amount of by-product of sodium hypochlorite.

Process:

Chlorine reacts with caustic soda to prepare an aqueous solution of sodium hypochlorite with a concentration of 10%~11%. Sodium hypochlorite reacts with cyanuric acid to produce it and sodium chloride products.

In order to control the pH value in the reaction process, chlorine can be added to make full use of the reaction materials, or inorganic acids (such as hydrochloric acid) can be used to neutralize.

advantage:

The reaction is carried out in the near neutral area, so the requirements for equipment materials are not high. Common enamel equipment and stainless steel centrifuge can be used.

Disadvantages:

(1) The product quality is slightly poor, generally containing 3%~4% sodium chloride, and the effective chlorine content of dry products can only reach about 60%;

(2) The dichloride mother liquor in this process contains more product. Due to the high salt content, it cannot be recycled, so the raw material consumption is high.

Improvement method:

(1) High concentration sodium hypochlorite (such as 25%~30%) is used to produce it, which can reduce the product

(2) The mother liquor is used to produce trichloroisocyanuric acid, so as to improve the utilization rate of raw materials.

Cyanuric acid and sodium dichloroisocyanurate powder are prepared into trisodium cyanuric acid salt in a ratio of 1:3 (molar ratio), and then chlorinated with chlorine at a certain temperature and centrifuged to obtain wet trichloroisocyanuric acid; Then, with cyanuric acid and sodium hydroxide solution in a ratio of 2:1:3 (molar ratio), the product is subjected to double decomposition reaction at 30-40 ℃, cooled, crystallized, filtered and dried to obtain powdered product.

advantage:

(1) Two main chloroisocyanuric acid products, trichloroisocyanuric acid and sodium dichloroisocyanurate, can be produced simultaneously, and the production volume of these two products can be adjusted at will according to the market demand;

(2) The double decomposition reaction adopts about 50% sodium hydroxide solution, which can realize the full application of dichloride mother liquor without discharge, and has little environmental pollution;

(3) The reaction yield is high, the product quality is good, and the salt content is low. The effective chlorine content can reach more than 62%, and the effective chlorine content of dihydrate can also reach 55%;

(4) The synthesis of trichloroisocyanuric acid can adopt continuous chlorination process, and the production is safe and reliable.

Disadvantages:

(1) The process of synthesizing trichloroisocyanuric acid has high requirements for reaction and centrifugal separation equipment and large equipment investment;

(2) In the production of trichloroisocyanuric acid, the chlorinated tail gas contains a large amount of unreacted chlorine, which is generally absorbed by sodium hydroxide to produce sodium hypochlorite, so a large amount of by-product sodium hypochlorite is produced.

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