C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/548.4
C07C 273/04 (2006.01)
Patent
CA 1094104
Abstract of the Disclosure This invention relates to a process for preparing urea by reacting NH3 and CO2 at an elevated temperature and pressure whereby urea is formed in a synthesis zone in the form of a urea synthesis solution when NH3 and CO2 are reacted at a pressure and temperature suitable for formation of urea. Ammonium carbamate is formed first which is then partly converted into urea and water, Thus from the urea synthesis zone an aqueous urea synthesis solution with non-converted carbamate, and usually an excess amount of NH3, is obtained. Non-converted carbamate and excess NH3 are removed from the urea synthesis solution, and usually recycled to the synthesis zone. To effect such separation the urea synthesis solution can be expanded and heated in two or more steps so that the carbamate reverts into NH3 and CO2. Alternatively the urea synthesis solution may, if necessary after partial expansion, be subjected to a stripping treatment with NH3 and/or CO2, with supply of heat and after expansion, reheated. In most known processes, the mixtures of gas- eous NH3, CO2 and water vapour separated off in the successive steps are ab- sorbed and condensed and returned to the urea synthesis zone as an aqueous solution. However, a disadvantage of returning non-converted NH3 and CO2 as a solution is that the water adversely affects the conversion of carbamate into urea, so that more carbamate must be decomposed and more steam is necessary for supplying the heat of decomposition. This disadvantage is overcome by the present invention. The process of the invention enables the decomposition of carbamate and the recycle of NH3 and CO2 to be carried out without undue energy requirement with a saving of investment costs.
290104
Biermans Andreas J.
Jonckers Kees
Fetherstonhaugh & Co.
Unie Van Kunstmestfabrieken B.v.
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