Method of introducing melamine off-gases into a urea plant
AssigneeAgrolinz Melamin GmbH
InventorGerhard Coufal
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Abstract
The invention relates to a method for producing urea. According to said method, the off-gases which originate from a melamine plant and essentially consist of NH3 and CO2 are introduced into the high-pressure zone of the urea plant by means of ejectors.
Claims9
Method for producing urea, in which the gases originating from a melamine plant and substantially comprising NH3 and CO2 are introduced directly into a high-pressure zone of a urea plant by means of one ejector or more, the ejector(s) being driven by one or more of the following as driving media:
- a) liquid NH3,
- b) gaseous NH3 or CO2,
- c) substantially NH3- and CO2-containing aqueous solutions,
- whereby one or more of said driving media is a process stream of the urea or the melamine plant.
Method according to claim 4, in which the gases originating from the melamine plant have a pressure of from about 70 to 200 bar and a temperature of from about 180 to 210° C.
Dependencies are inferred from the claim text.