Process for the recovery of valuable components from the waste streams obtained in the preparation of urea.

摘要

A process for recovering valuable components from waste streams containing urea, including a dilute aqueous urea solution and a urea containing waste gas stream, which result from the preparation of particulate urea products. The dilute aqueous urea solution is used to wash the urea containing waste gas stream whereby urea contained in the gas stream is dissolved in the aqueous urea solution. The aqueous urea solution thus obtained is then subjected to a hydrolysis treatment whereby the urea contained therein is hydrolyzed, and the ammonia and carbon dioxide thus formed are separated from the residual liquid stream.