| 摘要 |
Provided are a method for effectively removing triuret from aqueous urea, a method for producing high purity aqueous urea, and a method for recovering triuret from aqueous urea. To this end, the method for producing aqueous urea comprises a step of dissolving aqueous urea in water to form aqueous urea, a step of bringing the aqueous urea to a temperature in a range of 17°C or less to 5°C or more to make the aqueous urea cloudy, and a step of passing the clouded aqueous urea through an ion exchange resin. The present invention is also a method for removing and recovering triuret from aqueous urea, the method comprising a step of cooling aqueous urea that includes urea and triuret as an impurity to a temperature range of 17°C or less to 5°C or more to deposit triuret and make the aqueous urea cloudy, and a step of passing the aqueous urea through an ion exchange resin in said temperature range in a state where the aqueous urea is clouded, and allowing the ion exchange resin to capture the deposited triuret. |
