Stamicarbon B.v.

Rahul Patil

Branislav Manic

Petrus Anna Maria Robertus Simons

Lambertus Wilhelmus Gevers

Johannes Henricus Mennen

Fredericus Henricus Maria Buitink

Markus Theodorus Marie Michaël Wagemans

Solomon Assefa Wassie

The disclosure pertains to a plant and process for the coupled production of urea and melamine. In an embodiment, a lean carbamate solution is supplied from the melamine production section to a recovery section of the urea production section. In an embodiment, enriched carbamate solution from the urea production section is supplied to an off-gas condenser of the melamine production section.

Coupled urea melamine plant

The disclosure pertains to a urea production process wherein carbamate in a medium pressure (MP) urea solution is decomposed in a tube bundle of a high pressure (HP) carbamate condenser and resulting gas is condensed in indirect heat exchange with urea solution to be heated and wherein a high pressure (HP) stripper is preferably operated with relatively low stripping efficiency.

Low biuret urea production

Embodiments pertain to a urea plant and to the operation of a urea plant in a reduced load mode. In embodiments, two evaporators in parallel are used, connected to a finishing section respectively to a melamine plant.

Multiproduct low biuret urea production

The disclosure pertains to a high pressure carbamate condensation apparatus for a urea plant, a urea plant, and a urea production method. The apparatus comprises a first U-shaped tube bundle arranged around a second U-shaped tube bundle.

High pressure carbamate condensation apparatus

The disclosure pertains to urea production with, in series, an MP carbamate condenser for condensing at least urea synthesis section off-gas, gas/liquid separation giving a gas stream and a liquid stream, and a second carbamate condenser receiving off-gas from melamine production and said liquid stream.

Urea and melamine production

The disclosure pertains to a coupled plant process for the production of urea and melamine, with a urea synthesis section with HP COstripping, and with a part of the COfeed supplied to a recovery section.

Coupled urea melamine production with HP COstripping

Disclosed is a method for the removal of ammonia from the off-gas of a finishing section of a urea production plant. Also disclosed is a corresponding urea plant, and a method of accordingly modifying a pre-existing urea plant. In a scrubbing section, the off-gas is brought into contact with an acidic scrubbing liquid so as to provide a scrubbed off-gas and a utilized scrubbing liquid comprising ammonium salt. The method specifies an evaporation section, which is part of the urea plant that produces urea melt, that is divided into first and second stages. The first stage is part of the urea melt production plant. The second stage decoupled, as regards recirculation of liquids other than the urea product stream, from the urea melt production plant. This is accomplished by sending utilized scrubbing liquid that contains ammonium salts to the second stage evaporation section, and by sending condensed vapours from said second stage evaporation section to said scrubbing section.

Ammonia removal from urea finishing

A method for the removal of ammonia from the off-gas of a finishing section of a urea production plant, a corresponding urea plant, and a method of accordingly modifying a pre-existing urea plant. In a scrubbing section, off-gas is brought into contact with acidic scrubbing liquid to provide a scrubbed off-gas and a utilized scrubbing liquid comprising ammonium salt. The method specifies an evaporation section, which is part of the urea plant that produces urea melt, that is divided into first and second stages. The first stage is part of the urea melt production plant. The second stage is decoupled, as regards recirculation of liquids other than the urea product stream, from the urea melt production plant. This is accomplished by sending utilized scrubbing liquid containing ammonium salts to the second stage evaporation section, and condensed vapours from said second stage evaporation section to said scrubbing section.

A urea production process comprising concentrating a first urea solution in a first vacuum evaporator in an evaporation section to give a urea melt and a first vapor, and condensing the first vapor in a first condensation section, wherein the first condensation section is a chilled condensation section, and a urea production system comprising the chilled condensation section.

Urea plant with chilled condensation section

A urea production process which includes and a synthesis section, a recovery section and evaporation section and a finishing section wherein the evaporation section includes a first evaporator and downstream thereof a second evaporator for urea solution. The second evaporator operates a lower pressure than the first evaporator to provide a urea melt and second vapor, solidifying the urea melt in a finishing section to provide a solid urea produce and off gas, scrubbing the off gas followed by condensing to produce a first condensate and second condensate; supplying the first condensate to a wastewater treatment section and supply the second condensate to the scrubber wherein the second condensate is used as a scrub liquid in the scrubber.

Urea production with multiple evaporators

The invention pertains to a urea production process using a high pressure stripper and a low pressure decomposer connected to a low pressure carbamate condenser which is in heat exchanging contact through a wall with a sub-atmospheric decomposer wherein urea solution obtained from the low pressure decomposer is processed.

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Maastricht, Netherlands

Rahul Patil