A PROCESS FOR PRODUCING AMMONIA SYNTHESIS GAS WITH HIGH TEMPERATURE SHIFT AND LOW STEAM-TO-CARBON RATIO

摘要

A process for producing ammonia synthesis gas from a hydrocarbon containing feedstock in a front end comprising the steps of steam reforming of said feedstock obtaining a synthesis gas comprising hydrogen carbon monoxide and carbon dioxide; a treatment of said synthesis gas including shift of carbon monoxide and subsequent removal of carbon dioxide wherein the shift of the synthesis gas includes high temperature shift with an iron based catalyst and at a temperature greater than 300 �C and the global steam to carbon ratio of the front end is 2.6 or less; a corresponding plant and a method for revamping a front end of an ammonia plant are a lso disclosed.