C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
C07C273/14—Separation; Purification; Stabilisation; Use of additives
C07C273/16—Separation; Purification
C—CHEMISTRY; METALLURGY
C05—FERTILISERS; MANUFACTURE THEREOF
C05C—NITROGENOUS FERTILISERS
C05C9/00—Fertilisers containing urea or urea compounds
Process for the recovery of urea from the waste gases from the melamine synthesis from urea carried out in the gas phase, from which melamine has been removed