Producing pure carbon dioxide.

摘要

A feed gas stream containing from about 35 to about 98% by volume of carbon dioxide is united with a recycle stream and then compressed in compressor 102. The compressed gas stream is dried in a drier 110, cooled in a cooler 114, and separated in a distillation column 116 to produce a substantially pure liquid carbon dioxide product and a waste gaseous stream comprising carbon dioxide, oxygen and nitrogen. The waste stream is separated in a pressure swing adsorption apparatus 124 to provide a carbon dioxide-enriched stream which is the one united with the feed gas stream.