METHOD OF CONTINUOUS MELAMINE OBTAINING Russian patent published in 2015 - IPC C07D251/60 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to a method of continuous melamine obtaining, where liquid carbamide, used as an initial material, is converted in a fluidised bed reactor in the presence of a catalyst with the supply of heat and addition of ammonia into the technological gas, consisting mainly of melamine, ammonia, carbon dioxide, isocyanic acid as an intermediate product and by-products, which after the separation of by-products and melamine from it is supplied into the scrubber, in which it is washed with liquid carbamide and relieved from isocyanic acid and a part of the technological gas, discharged from the scrubber is used in the fluidised bed reactor as the turbulising gas, a part is used in the crystalliser as the cooling gas and a part is discharged from the technological gas circulation circuit, where downstream before the scrubber from the technological gas flow discharged is a partial flow, which is passed past the scrubber, and downstream before the reactor with the fluidised catalyst bed is introduced into the processed in the scrubber technological gas flow, intended for turbulisation.

EFFECT: optimisation of the method with respect to the possibility of setting such temperature at the input point of the compressor or pressuriser of the fluidised bed reactor, which would make it possible to avoid both the carbamide sedimentation and excessive temperature impact of the feeding element.

4 cl, 1 dwg, 1 tbl