Production Status of Trichoroisocyanuric Acid

Trichloroisocyanuric acid (TCCA) chlorine is one of the important varieties of chlorinated isocyanuric acid products. It is a new generation of high-efficiency bleach, chlorinating agent and disinfectant. It has high sterilization and bleaching power, stable storage and transportation, and safe use , Long time to release effective chlorine in water, etc. It has been used as a disinfectant in industrial water, swimming pool water, cleaning agents, hospitals, tableware, etc. Used as a disinfectant in sericulture and other breeding. In the cyanogen industry, it is used for the bleaching of wool shrink-proof fabrics and paper. It is an ideal upgrade product for traditional disinfection products.

Production Process

According to the different raw materials, the production methods of trichloroisocyanuric acid are divided into sodium salt method, calcium salt method, hypochlorous acid method, sodium hypochlorite method, etc. Most enterprises adopt sodium salt method.

Sodium Salt Method

Due to the fierce reaction of the sodium salt method, the chlorination reaction temperature control requirement is strict, and the reaction temperature should not exceed 20℃. Otherwise, it will not only increase the risk of chlorination reaction, but also increase the viscosity of the chlorinated slurry, which will make centrifugal dehydration difficult. The amount of trichlorine produced in the sodium salt method production is far more than that in the calcium salt method, so special attention should be paid to safety issues and strengthened testing during the production process. If the ion-exchange membrane caustic soda is used as the raw material, the purity of the product will be further improved. At the same time, the sodium salt method has fewer impurities, which is beneficial to the use in the fields with higher requirements.

Sodium dichloroisocyanurate (NaDCc) deep chlorination method

A 10%-11% sodium hypochlorite solution is prepared by the reaction of caustic soda and chlorine, and then reacted with refined isocyanuric acid at 20-25 ℃. The product is cooled and crystallized to form sodium dichloroisocyanurate. The yield of sodium hypochlorite method is generally 70% to 80%. When the cooling crystallization temperature is not low enough, the separated mother liquor still contains about 20% of sodium dichloroisocyanurate. If the chlorine gas is continued to be passed into the NaDCC, the NaDCC will be deeply chlorinated, and trichloroisocyanuric acid with a smaller solubility will be precipitated. This kind of mixed chlorination can produce both sodium dichloroisocyanurate, trichloroisocyanuric acid, or all trichloroisocyanuric acid. If you need to adjust the output of the two products, you only need to change the crystallization temperature of the sodium dichloroisocyanurate solution, which is a production method that is easier to adapt to market needs.

Differential circulation continuous chlorination production process

The process adopts differentiation method for chlorination, and the process of reaction, crystallization, crystal growth and flow out is completed in the reactor in a regionalized and continuous manner by means of loop flow. The product is formed quickly and the molding is stable. Therefore, the product is not easy to be lost during the post-treatment processes such as filtration, washing, and drying, and the yield is high. At the same time, the rapid formation of the product inhibits the progress of side reactions, and it is difficult to form nitrogen trichloride. The product has a high content of available chlorine, stable above 90%, and has reached the standard of superior grade required for export.