METHOD OF PURIFICATION OF CARBON DIOXIDE

摘要

A method for decontaminating fluid carbon dioxide for use in a product production process such as carbonated beverage production is disclosed. Contaminants, including those normally highly resistant to removal such as S, N, P and Si compounds (especially COS), are removed from the CO2 by contact with a metal oxide decontamination agent. The metal oxide is one or more oxides of transition metal elements including lanthanides, the fron oxides being preferred. Decontamination ofthe CO2 is interrupted at intervals for regeneration of the metal oxide agent by passage of CO2 containing an oxygen-containing contaminant over the metal oxide in a countercurrent flow direction at higher temperature for a short time. The metal oxide decontaminant may also be mixed with a high-silica content zeolite, preferably a Zeolite Y or zeolite ZSM-5. The contaminated CO2 and the CO2 containing an oxygen-containing contaminant are preferably from the same source.