Patent ID: 11912649
Assignee: STAMICARBON B.V.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 1:
2. A method for the production of a solid urea product, comprising producing an aqueous urea solution, evaporating water from said aqueous urea solution in a first stage evaporation section so as to form a first water vapour and a concentrated urea solution, providing all of the concentrated urea solution to a second stage evaporation section and further evaporating water from the concentrated urea solution in the second stage evaporation section to form a second water vapour and a urea melt, and conversion of the urea melt into the solid urea product thereby generating an ammonia-containing off-gas; subjecting said ammonia-containing off-gas to contact with an acidic scrubbing liquid in a scrubbing system so as to provide a scrubbed off-gas and a utilized scrubbing liquid comprising an ammonium salt and water; the method further comprising sending the utilized scrubbing liquid to said second stage evaporation section, thereby subjecting it to evaporation of water together with the concentrated urea solution.