Method of retrofitting a pre-existing plant for urea production including an ammonia stripping section.

摘要

A method of retrofitting a pre-existing plant for urea production including a first urea synthesis reactor (R) in fluid communication with an ammonia stripping section (SS), achieves substantial energy savings and production capacity increase by providing the steps of connecting a second urea synthesis reactor (ROT) of the "once through" type to and upstream of the ammonia stripping section (SS), and of distributing the overall production capacity of the plant to apportion from 50 to 95% thereof to the first (R) and from 5 to 50% to the second (ROT) urea synthesis reactor.