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US 12,134,590 B2Granted
Coupled urea melamine production with HP CO2 stripping
AssigneeStamicarbon B.V.
InventorsRahul Patil, Johannes Henricus Mennen, Lambertus Wilhelmus Gevers
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Abstract
The disclosure pertains to a coupled plant process for the production of urea and melamine, with a urea synthesis section with HP CO2 stripping, and with a part of the CO2 feed supplied to a recovery section.
Claims20
A coupled process for the production of urea and melamine, the process comprising:
- producing urea in a high pressure urea synthesis section comprising a high pressure (HP) CO2 stripper yielding a stripped urea solution, wherein the HP CO2 stripper uses a first part of a gaseous CO2 feed stream as stripping agent;
- producing melamine in a melamine production section thereby also releasing melamine off-gas;
- supplying said melamine off-gas, optionally as condensate, directly or indirectly to the high pressure urea synthesis section;
- supplying the stripped urea solution directly or indirectly via a liquid flow connection to a low pressure (LP) dissociator, yielding purified urea solution and a low pressure gas stream;
- subjecting the low pressure gas stream to condensation in a low pressure (LP) carbamate condensation zone with a second part of the gaseous CO2 feed stream to form a carbamate solution.
2 more elements
A coupled plant for the production of urea and melamine, the plant comprising:
- a high pressure urea synthesis section for producing urea, comprising a high pressure (HP) CO2 stripper having an outlet for a stripped urea solution, and an inlet for a first part of a gaseous CO2 feed stream used as stripping agent;
- a melamine production section having an outlet for melamine and an outlet for melamine off-gas;
- a fluid flow connection for supplying said melamine off-gas, optionally as condensate, directly or indirectly to the high pressure urea synthesis section;
- a liquid flow connection for supplying the stripped urea solution directly or indirectly to a low pressure (LP) dissociator having an outlet for a purified urea solution and an outlet for a low pressure gas stream;
- a low pressure (LP) carbamate condensation zone configured for subjecting the low pressure gas stream to condensation with a second part of the gaseous CO2 feed stream to form a carbamate solution, the plant comprising a gas flow connection from a CO2 supply unit to the LP carbamate condensation zone and a gas flow line for said low pressure gas stream from said low pressure (LP) dissociator to said low pressure (LP) carbamate condensation zone.
2 more elements
Dependencies are inferred from the claim text.