Cryogenic rectification method and apparartus for producing elevated pressure product

摘要

A cryogenic rectification system for producing elevated pressure product (32) wherein the lower pressure column (55) of a two column system is operated at elevated pressure and nitrogen-containing fluid (21) taken from the upper portion of the lower pressure column is used to generate plant refrigeration (53) and to regenerate feed purifier adsorbent beds (51) thus avoiding the need for any feed expansion.