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The invention relates to a method for producing a carbamide from ammonium and carbon dioxide by forming in a synthesis area a carbamide melt flow which is processed in two distillation stages, wherein carbamide solutions and gas flows are separated and form carbon-ammonium salt solutions after conde...

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Bibliographische Detailangaben
Hauptverfasser:	RINAT ANDERZHANOV, ALEKSANDR PROKOPYEV, IGOR ESIN, ALEKSEI SOLDATOV, YURY SERGEEV, IVAN GUSEV, NIKOLAI KUZNETSOV
Format:	Patent
Sprache:	est
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	The invention relates to a method for producing a carbamide from ammonium and carbon dioxide by forming in a synthesis area a carbamide melt flow which is processed in two distillation stages, wherein carbamide solutions and gas flows are separated and form carbon-ammonium salt solutions after condensation and absorption thereof. At the first distillation stage, the melt is supplied from a column to the first distillation area, wherein said melt is disintegrated in a film heat exchanger in the carbon dioxide flow. A gas phase obtained at the first distillation stage is used for heat exchange at the second distillation stage. The inventive device comprises a first stage distillation column whose top section is connected to a recuperative heat exchanger in the second area of the second distillation stage, whereas the column lower section is connected to the film heat exchanger provided with the carbon dioxide input. The distillation column and the film heat exchanger of the first distillation stage are connected to the recuperative heat exchanger in the first area of the second distillation stage. The first and second distillation stages are provided with devices for condensing and absorbing distillation gases. The second distillation stage is provided with a recuperative heat exchanger which is arranged thereon, is used for evaporating and concentrating the second stage distillation gases and is connected to the heat exchanger-recuperator of the first area of the second distillation area.