KARBAMIDO GAMYBOS METODAS IR IRENGINYS

摘要

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 thecarbon 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 ar