FIELD: organic chemistry, in particular urea producing from carbon dioxide from carbon and ammonia incorporated with production of syngas followed by conversion thereof to ammonia.
SUBSTANCE: claimed method includes step of syngas production containing carbon dioxide for ammonia synthesis; step of syngas conversion to ammonia; reaction of ammonia with carbon dioxide in syngas to produce ammonium carbamate; further conversion thereof to produce urea. Method also includes washing of starting syngas with ammonia aqueous solution, removing of ammonia excess from washed syngas by washing with water and recovering of ammonia aqueous solution. Washed with water syngas is purified by removing of rest water and ammonia and converted to ammonia. In syngas washing step with ammonia aqueous solution washed syngas stream is cooled and ammonia is isolated in liquid form. Further syngas is purified from rest water and ammonia and obtained stream is recycled into washing step.
EFFECT: improved incorporated process for production of carbon dioxide and ammonia reagent from syngas and production of urea via ammonium carbamate intermediate.
1 ex, 2 dwg, 6 tbl
