Method for preparing sodium dichloro isocyanurate

Abstract

The invention relates to a preparation method of babysafe, which uses isocyanuric acid, chlorine and caustic soda as main materials, combines chlorination that adds chlorine and chlorination via sodium hypochlorite to produce babysafe. Compared with direct chlorination via isocyanuric acid, the invention improves product yield from less than 90% to more than 95%, significantly improves product colority, reduces product synthesis time in single reactor from 3.5-4h to less than 2h, reduces cyanuric acid consumption from 0.68t to less than 0.65t, reduces chlorine consumption from 0.72t to less than 0.70t, reduces caustic soda (30%) consumption from 1.4t to less than 1.3t, and approaches caustic soda consumption to direct chlorination method. Compared with direct chlorination, the partially absorbed chlorine is absorbed by liquid alkali to be converted into sodium hypochlorite, while the generated sodium hypochlorite content is about 10%, to be directly used for producing and reclaiming target product. The invention resolves the problems of babysafe production as high cost and serious environment pollution caused by high chlorine consumption.

Description

Technical field: [0001] The invention relates to a method for preparing sodium dichloroisocyanurate, in particular to a method for preparing sodium dichloroisocyanurate by adopting chlorination and sodium hypochlorite chlorination in combination. Background technique: [0002] Sodium dichloroisocyanurate (referred to as DCCNa) is one of the important varieties of chlorinated isocyanuric acid products, also known as wool finishing agent DC, excellent chlorine net, scientific name 1,3-dichloro-s-triazine triazine Sodium ketone, the appearance is white powder crystal, with a slight chlorine odor, molecular formula C 3 Cl 2 N 3 NaO 3 , the molecular weight is 219.95, the theoretical effective chlorine content is 64.5%, the melting point is 230-235 ℃ (decomposition), 25 g of this product can be dissolved in every 100 mL of water at 25 ℃, and the pH value of 1% aqueous solution is 6.5. The bulk specific gravity of the powder product is 0.50-0.65g / cm 3 , the bulk specific grav...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a high-yield industrial synthesis method of sodium dichloroisocyanurate, and at the same time solve the problem that the chlorine gas cannot be fully utilized in the direct chlorine flow process, which causes a large smell in the production environment and has a serious impact on the surrounding environment.