Study On The Preparation And Stability Of Chlorine Dioxide

Chlorine dioxide (ClO₂) is an acknowedged and safe kind of disinfectant in the world and it has a wide range of developing prospect. Firstly the preparation of chlorine dioxide was invstigated and the opimum technology (basic reactant: NaClO₃, acid: H₂SO₄, reducing agent: saccharose and properly reactive temperature) of prepraration about chlorine dioxide was gained. Secondly, experimental studies on thermal stability of chlorine dioxide in near neutral aqueous solution were performed and effects of temperature and stabilizers discussed and two organicses such as PVP and PCTS were picked out because they can prominetly stabilize chlorine dioxide in aqueous solution. Fartherly experimental studies on the best collocation (stabilizing agent: PVP, collocating temperature: 50℃, concentration of PVP: 3g/l; stabilizingagent: PCTS, colloacting temperation: 30℃, concentration of PCTS: 3g/l) of two stabilizing solutions were performed under our experimental condition, synchronously, under the condition of the choiced proving level α = 0.25, preparating temperature and the concentration of stabilizing agent were unconspicuous affecting factor for stability of chlorine dioxide. Finally, organic stabilizing mechanism of chlorine dioxide was discussed. It is confirmed with UV spectrum that active constituent of the organically stabilized solution would still exist in the form molecular of ClO₂ and not the form ion of ClO₂^-, so chlorine dioxide is released from stabilizing solution under the no active agent. A kind of reciprocity exists between chlorine dioxide and PVP.