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Using Trichloroisocyanuric Acid (TCCA) as a chlorination agent

The continuous gas–solid (environmentally-friendly) chlorination of deactivated arenes using Trichloroisocyanuric Acid (TCCA) (C3N3O3Cl3) as a chlorination agent was chosen to compare the catalytic performances of various MFI-type catalysts in a reaction demanding a strong acidity. Mass transfer limitations were also evaluated by reacting either chloro- or nitrobenzene through a ZSM-5 zeolite porous network having different crystal sizes and morphologies. Whereas, the reaction rate was completely controlled by internal diffusion in 10–15 μm-sized big ZSM-5 zeolite crystals (Weisz modulus, ?big crystals ~10), the impact of internal diffusion could be ruled out for ZSM-5 nanocrystals (200–400 nm) and in stacked ZSM-5 nanosheets (thickness 2 nm). Based on reactivity differences in arene halogenation between the two nano-sized ZSM-5 zeolites, we were able to estimate the quantity of mild acidic silanol groups in ZSM-5 nanosheets to roughly 1/3 of the total amount of Br?nsted acid sites.
Laboratory static test results show that: the first increase in residual chlorine concentration in the water when Trichloroisocyanuric Acid (TCCA) was dissolved and then decrease substantially when completely dissolved chlorine concentration reached a maximum. First added TCCA initial mass concentration of the greater attenuation of residual chlorine in water sooner. Organic matter in sewage of hypochlorous acid consumption caused by chlorine reduction. Under different water conditions, adding the same concentration of chlorine may have different initial mass concentration, showing different bactericidal effect. 
Trichloroisocyanuric Acid (TCCA) almost no corrosive effect on stainless steel, brass intense corrosion than carbon steel corrosion. The study was able to TCCA in the circulating cooling water system application to provide technical support.