Thermal transformations of CO(H2PO4)(2)center dot 2H(2)O

Thermal transformations of Co(H2PO4)(2).2H2O in air, vacuum, water-vapor at mosphere were studied by the methods of DTA, XRD, paper chromatographic ana lyses and gravimetry. It was established that the removal of the water of c rystallization is accompanied by the processes of anionic condensation and disproportionation when dihydrate is heated in air. It was also shown that X-ray-amorphous anhydrous cobalt dihydrogenphosphate is forced only in vacu um under isothermal conditions. The kinetic characteristics of this reactio n were obtained and the possibility of proceeding of dehydration-rehydratio n processes in cyclic regime was studied. (C) 1999 Elsevier Science B.V. Al l rights reserved.