III International Conference

PP-III-56DESTRUCTIVE OXIDATION OF HALOGENATED ORGANIC SUBSTANCES ONEARTH ALKALI OXIDES AND HYDROXIDESVnutskikh Zh.A., Permyakova O.V., Chekryshkin Yu.S., Fyodorov A.A.The Institute of Technical Chemistry of the Ural Branch of RAS, Perm, RussiaE-mail: cheminst@mpm.ruInteractions of fluorinated liquid M-1 and polyvinylchloride (PVC) with CaO, MgO andCa(OH) 2 were studied. The composition of reactions products and kinetic parameters weredetermined. The influence of various factors on bonding degree of halogen evolved fromorganic compound to ecologically nonhazardous compounds was established. It was shown,that interaction between mentioned halogenated organic compounds and alkali earth oxides(hydroxides) runs according to “solid – gas” reaction type with participation of gaseousoxidation productsUtilization of residues of solid and liquid halogenated organic compounds production iscomplicated problem which is not completely solved nowadays. It was shown, thatfluorinated liquid M-1 is destructed with high efficiency in molten catalyst (LiCl-NaCl-KCl)eut.+15 wt.% V 2 O 5 [1]. However, during the reaction emissions of F 2 , HF and CO 2 to the gasphase occur. At the same time, these emissions can be avoided in reaction betweenpolytetrafluoroethylene and earth alkali oxides (hydroxides) in the presence of oxygen [2].With the help of DT-TG analysis behavior of M-1 at nonisothermal conditions wasstudied. Weight losses occurred at 90-240 o C are connected with evaporating of this liquid.Reaction between M-1 vapor and calcium oxide in the presence of atmospheric oxygen inflow reactor at 450-550 o C produces nontoxic compounds – calcium fluoride and carbonateaccording to the equation(CF 2 ) n + 2nCaO +n/2O 2 → nCaF 2 + nCaCO 3 ,bonding degree of the fluorine in this reaction depending on process conditions is 98-99 %,bonding degree of the carbon – 92-95 %.Thermal-oxidative destruction of PVC and its reactions with MgO and Ca(OH) 2 runs throughseveral stages in temperature rage 190-450 o C and includes stage of dehydrochlorination andconsequent interaction of evolved HCl with alkali earth metal oxide (or hydroxide).Kinetics of interaction of PVC with MgO and Ca(OH) 2 was studied in temperature range290-320 o C and mass ratio (M) MgO (Ca(OH) 2 ) : polymer of 2 and 3. Dependence of polymer Cl 2bonding degree with time is S-shaped, this indicates the acceleration of metal chlorides forming atthe initial period caused by autoacceleration of PVC dehydrochlorination process [3].576