In order to develope the technology of urea phosphate, the reaction kinetics of dissolving urea in phosphoric acid was studied under the condition of eliminating liquid diffusion have been studied. The effects of reaction temperature, urea particle size and phosphoric acid concentration on the dissolution were investigated. Reaction kinetic equation of approaching first order reaction was obtained throughout analyzing and handling of experiment data for caculating some parameters.The results is a good foundation for further research and industrial application.
