METHOD FOR REVAMPING A SELF-STRIPPING UREA PLANT AND PROCESS FOR SYNTHESIS OF UREA

摘要

A method for revamping a self-stripping urea plant is disclosed, where an intermediate recovery section (30) is installed between the existing high-pressure section and medium-pressure section; a stream of urea solution (15A), which is delivered by the high pressure section and originally directed to the medium pressure section, is at least partly redirected to said intermediate section (30), and a flow of concentrated solution (15B) from said intermediate section is directed to said medium pressure section, the intermediate section operating at a pressure between those of the high- and medium-pressure sections. A related process and plant are also disclosed.