Study On Decomposition Character And New Stabilizer Of Sodium Hypochlorite

The research of the decomposed characteristic of sodium hypochlorite shows that it's the macroscopically result by a series of reaction caused by NaClO=NaCl+[O] which mainly causes the decompose of the sodium hypochlorite solution.The macroscopically decompose reaction is pseudo first order reaction.During the multi-component decompose reaction,the advantage reaction will be changed basing on the different conditions of the reactions,which shows the variety of the macroscopically reaction rate of the constant K and apparent activation energy Ea under different concentration.The research for the effect of the stability factors caused by sodium hypochlorite solution shows that PH value has bigger affect for the stability of available chlorine of sodium hypochlorite,and the most suitable pH value is 7～7.5.The existing for Ca²⁺,Mg²⁺has no bigger effect for the stability of the sodium hypochlorite solution,Fe³⁺and Fe²⁺can accelerate the decompose procedure.The research of the new style sodium hypochlorite stabilizer shows that the valid content of chlorine can still keep the initial's 91.73%after adding 0.6%Sodium chloride into the sodium hypochlorite solution,then keeping 4 hours under 55℃in a opened container,if putting in a sealed container by 19 hours,the.valid content of chlorine in can reach initial's 83.95%.If adding boron nitride(5mg·L^-1)into sodium hypochlorite solution,the valid period for the solution of sodium hypochlorite can increase to 154 days from the original 3days under 25℃,and half life can increase to 1011 days from the original 18 days.If adding a certain mixture composed by sodium chloride and boron nitride(2g·L^-1:5mg·L^-1),it can increase the validity period of sodium hypochlorite solution to 198 days,half life to 1302 days.Using the mixture composed by sodium chloride and boron nitride as stabilize which can improve the stability of the sodium hypochlorite solution and extend the storage time of the solution.Also,the mixture effect of the two types is better than only adding one of them.Due to the alkali characteristic of the solution of sodium hypochlorite,the normal substance can solute little,but the mixture solution of sodium chloride and sodium hypochlorite can form well-proportioned solution.The method is easy,simple,low cost which has a certain promotion value.The influence mechanism for the stability of mixture composed by sodium chloride and boron nitride:on one hand,the existing of sodium chloride caused the decompose of sodium hypochlorite to the reverse direction and on the other hand,boron nitride stabilizes the sodium hypochlorite solution.