METHOD OF PURE ARGON PRODUCTION BY AIR RECTIFICATION Russian patent published in 2004 - IPC

FIELD: processes or apparatus for separating the constituents of gaseous mixtures, particularly air separation equipment.

SUBSTANCE: method involves producing argon fraction in double-rectification column, rectifying argon fraction into the second column with oxygen removal from argon fraction; overcooling liquid argon fraction removed from the second column into overcooling device by means of gaseous nitrogen flow fed from the third column; supplying overcooled liquid argon fraction into the third column; separating argon fraction into the third column for obtaining pure argon.

EFFECT: eliminating necessity of additional pressure increase in upper column of rectification unit, increased expander cooling capacity.

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