| 摘要 |
The invention relates to a method for preparing crystalline carbamide of high purity, to be used as an additive in food industry and as a reagent in laboratory analysis. According to the invention, the method consists in heating the carbamide aqueous solution up to a temperature of 20...30°C for a concentration of 30%, to 50...60°C for a concentration of 50%, to 70...80°C for a concentration of 70% and to 90...130°C for a concentration of 90% or higher, the solution being purified by electrodialysis at a voltage in the range of 400...600 V. |
