Kinetics of celestite conversion to acidic strontium oxalate hydrate in aqueous solution of oxalic acid

摘要: Abstract Conversion of SrSO 4 to acidic strontium oxalate hydrate (H[Sr(C 2 O ) 1.5 (H O)]) in aqueous H C solutions proceeds as a consecutive reaction. In the first step reaction, reacts with and pseudomorphic conversion SrC ·H occurs. second step, form H[Sr(C O)]. Sr(HC )(C 0.5 crystallizes during cooling reaction mixture room temperature if solution reaches saturation concentration The aims this study are derivation rate equations determination kinetic parameters such pre-exponential factor, apparent activation energy order for each step. Fractional conversions were calculated using quantitative amounts dissolved S Sr. It was determined that increased at initial time by increasing approximately same concentrations. extends very slowly after certain low ends formation protective layer around surfaces solid particles. is constant temperature. Kinetic model derived shrinking core