| 摘要 |
PURPOSE: Provided is an improved method for producing krypton and/or xenon by low temperature fractionation of air, which is performed by an economically favorable mode. CONSTITUTION: The method comprises the steps of: introducing a compressed and cleaned charge air(1) into a rectification system for nitrogen-oxygen separation, that comprises at least a high-pressure column(2) and a low-pressure column(3); removing a krypton- and xenon-containing fractions from the high-pressure column(2); introducing the fractions into the evaporation zone of a first condenser- evaporator(17) to evaporate the fractions partially; extracting a purge liquid(26,226) from the evaporation zone; feeding the purge liquid into a krypton-xenon concentration column(24); and recovering a krypton-xenon concentrate(30) from the column(24). The method comprises the step of introducing a liquid discharged from the bottom of the column(24) into a second condenser-evaporator(27) separate from the first condenser-evaporator(17).
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