The integration of urea and ammonia process is a tendency for the development of urea production. In this paper

the development work on integrated urea-ammonia process by stripping with converted gas at medium-pressure is described and this process has been proved in an industrial plant. The result of techno-economic feasibility study has shown it to be viable. A detailed review is also given on the choice of the stripping tower - the critical equipment of the process. Problems encountered are discussed

and the direction of improvement is presented.