Air separation unit and air separation method
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l’Exploitation des Procedes Georges Claude
InventorKenji HIROSE
Life of this patent
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Abstract
The method for reducing or removing non-volatile impurities in a high-purity oxygen liquid comprises: an oxygen vaporization step for vaporizing a high-purity oxygen liquid obtained from a high-purity oxygen rectification column in an air separation unit for producing the high-purity oxygen liquid; and an oxygen recondensing step for recondensing oxygen gas vaporized in the oxygen vaporization step. This method may also comprise a high-purity oxygen liquid extraction step for extracting a condensate obtained in the oxygen recondensing step.
Claims6
A method for reducing or removing non-volatile impurities in a high-purity oxygen liquid, the method comprising:
- vaporizing a high-purity oxygen liquid obtained from a high-purity oxygen rectification column in an air separation unit for producing the high-purity oxygen liquid;
- and
- recondensing oxygen gas vaporized in the step of vaporizing the high-purity oxygen liquid.
An air separation unit comprising:
- a nitrogen rectification column having a first nitrogen rectifying portion in which high-boiling-point components are concentrated, and a second nitrogen rectifying portion in which low-boiling-point components are concentrated;
- a high-purity oxygen rectification column into which an oxygen-containing liquid drawn from the first nitrogen rectifying portion is introduced;
- a liquid feed pump for feeding an oxygen-rich liquid collected in a bottom of the second nitrogen rectification column to a column top of the first nitrogen rectifying portion;
- an oxygen vaporizer which is arranged in a lower portion of the high-purity oxygen rectification column and serves to generate a vapour stream of oxygen gas;
- and
- an oxygen recondenser into which a portion of the oxygen gas generated in the oxygen vaporizer is introduced, in order to condense this oxygen gas.
An air separation unit comprising:
- a nitrogen rectification column;
- a high-purity oxygen rectification column having a first oxygen rectifying portion in which high-boiling-point components are concentrated, and a second oxygen rectifying portion in which low-boiling-point components are concentrated;
- a liquid feed pump for feeding an oxygen-rich liquid collected in a bottom of the first oxygen rectifying portion to a column top of the second oxygen rectifying portion;
- an oxygen vaporizer which is arranged in a lower portion of the second oxygen rectifying portion and serves to generate a vapour stream of oxygen gas;
- and
- an oxygen recondenser into which a portion of the oxygen gas generated in the oxygen vaporizer is introduced, in order to condense this oxygen gas.
Dependencies are inferred from the claim text.