Phase Diagrams of Na2CO3–CO(NH2)2–H2O2–H2O System at 0 °C and 25 °C and the Production of Urea Peroxide and Sodium Percarbonate

There is a great deal of H2O2 loss and low production benefit in the traditional technology of urea peroxide production. To develop a new method of producing urea peroxide, the mutual solubilities in the quaternary system Na2CO3–CO(NH2)2–H2O2–H2O were measured, and the corresponding diagrams were plotted at 0 °C and 25 °C. Based on the analysis about the phase diagram, this work put forward a new technology of the combination production of urea peroxide and sodium percarbonate. Urea peroxide was first produced at 0 °C; then sodium percarbonate was produced according to the reaction of Na2CO3 with the residual solution after urea peroxide production at 25 °C. After sodium percarbonate production, the residual solution was evaporated and concentrated and then used to produce urea peroxide, and thereby the stable recycle production of CO(NH2)2·H2O2 and Na2CO3·1.5H2O2 could be realized.