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, and combines chlorination that adds chlorine and chlorination with sodium hypochlorite to produce babysafe. Compared with direct chlorination with 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. Background technique: [0002] Sodium dichloroisocyanurate (DCCNa for short) is one of the important varieties of chlorinated isocyanuric acid products. It is also known as wool finishing agent DC, Uchlorjing, and its scientific name is 1,3-dichloro-s-triazine Sodium ketone, the appearance is white powdery crystals, slightly chlorine odor, molecular formula C 3 Cl 2 N 3 NaO 3 , Molecular weight is 219.95, theoretical available chlorine content is 64.5%, melting point is 230-235℃ (decomposition), 25g of this product can be dissolved per 100mL of water at 25℃, and the pH value of 1% aqueous solution is 6.5. The volume specific gravity of the powdered product is 0.50—0.65g / cm 3 , The volume specific gravity of granular products is 0.90—0.96g / cm 3 ; Sodium...

AI Technical Summary

Problems solved by technology

[0010] 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.