Process for urea production involving a carbon dioxide stripping step

A process of producing urea comprising the steps of:

• reacting ammonia and carbon dioxide in a first reaction space;
• effecting a gas stripping with carbon dioxide of a first reaction mixture leaving said first reaction space, so as to obtain a purified urea solution and unreacted ammonia and carbon dioxide vapors;
• feeding said purified urea solution to a first urea recovery section;
• condensing at a predetermined pressure said unreacted ammonia and carbon dioxide vapors in a carbamate condenser;
• reacting ammonia and carbon dioxide in a second reaction space;
• wherein the method further comprises the steps of:
• a) submitting a second reaction mixture leaving said second reaction space to a first carbamate decomposition treatment at a pressure substantially equal to the pressure of the carbamate condenser, so as to separate a first stream of unreacted ammonia and carbon dioxide vapors from a liquid stream including urea;
• b) recycling the first stream of unreacted ammonia and carbon dioxide vapors to said carbamate condenser;
• c) submitting the liquid stream including urea to a second carbamate decomposition treatment so as to separate a second stream of unreacted ammonia and carbon dioxide vapors from a purified urea solution;
• d) condensing said second stream of unreacted ammonia and carbon dioxide vapors and recycling the condensate thus obtained to said carbamate condenser.