| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of efficiently removing triuret from urea water, a method of producing urea water with high purity, and a method of collecting triuret from solution.SOLUTION: A production method of urea water comprises the steps of: obtaining urea water by dissolving urea water in water; making the urea water in a temperature range of -5°C or more and 17°C or less, thereby obtaining cloudy urea water; and passing the cloudy urea water through anion exchange resin. A method of removing triuret from urea water comprises the steps of: cooling urea water containing urea and triuret as impurity to a temperature range of -5°C or more and 17°C or less and depositing the triuret; and passing the urea water through ion exchange resin in the temperature range, and capturing the deposited triuret on the ion exchange resin. |
