PROCESS OF MANUFACTURING SUBSTANTIALLY PURE CARBON DIOXIDE FROM SUPPLIED MATERIAL CONTAINING CARBON DIOXIDE

摘要

PURPOSE: To efficiently produce pure CO2 by distilling a feed containing 35 to 98 vol.% CO2 to produce a liquid containing pure CO2 and a CO2 -contg. waste flow, and treating the waste flow by a pressure swing means. CONSTITUTION: A feed containing 35 to 98 vol.% CO2 is distilled to produce a liquid product containing substantially pure CO2 and a first waste flow containing CO2 . Then the first waste flow is introduced into a pressure swing adsorbing means, where the first waste flow is separated into a flow having a high CO2 content and a second waste flow having small CO2 content. The flow having a high CO2 content is added to the feed containing CO2 above described and recycled. The feed containing CO2 is preferably prellminarily compressed and dried, and then cooled before distilled.