Patent ID: 11958792
Assignee: STAMICARBON B.V.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A urea production process carried out in a urea production plant, the plant comprising a high pressure (HP) synthesis section and a first and a second medium pressure (MP) recovery section,
wherein the HP synthesis section comprises a HP reaction zone, a HP thermal stripper, a HP carbamate condenser, and a separator, wherein the HP thermal stripper has an outlet for a stripped urea solution connected to the first MP recovery section and an outlet fora gas connected to the HP carbamate condenser,
the process comprising:
separating a reaction mixture from the HP reaction zone at high pressure in said separator into a first stream and a second stream, wherein the first stream and the second stream both contain a liquid phase containing urea;
supplying the first stream at least in part to the HP thermal stripper, and obtaining stripped urea solution from the HP thermal stripper; and
supplying the second stream at least in part to the second medium pressure recovery section,

wherein the first stream has a lower gravimetric density than the second stream and the first stream is an ammonia-rich first stream having a higher concentration of ammonia than the second stream.