PROCESS FOR THE PREPARATION OF UREA

摘要

The invention relates to a process for the preparation of urea from ammonia and carbon dioxide in a urea process wherein the synthesis section contains a scrubber wherein the off-gas stream from the synthesis section is purified of ammonia and carbon dioxide and wherein the scrubber is a medium-pressure scrubber that is operated at a pressure of 1-5 MPa The invention also comprises a process for modifying existing urea processes and a urea plant comprising a high-pressure synthesis section wherein a medium-pressure scrubber is included.