Argon separation method and apparatus therefor

An argon separation method in which air is liquefied and distilled in a double distillation column, oxygen and nitrogen is collected, argon-containing oxygen is withdrawn from the lower pressure column of the double distillation column, directed into a crude argon column, distilled to obtain crude argon, and the obtained crude argon is sent to a deoxidation column, and distilled to obtain deoxidized argon;

• comprised,
• a dry-type condenser is employed as the condenser for the deoxidation column, and liquefied air withdrawn from a plate which is higher than the bottom of the higher pressure column is supplied as a cold source for the condenser.

An argon separation method in which air is liquefied and distilled in a double distillation column, oxygen and nitrogen are collected, argon-containing oxygen is withdrawn from the lower pressure column, sent to one or two distillation columns, distilled to obtain deoxidized argon, and the deoxidized argon is sent to a pure argon column and distilled to obtain pure argon;

• comprised,
• a dry-type condenser is employed as the condenser for the pure argon column, and liquefied air withdrawn from a plate which is higher than the bottom of the higher pressure column is supplied as a cold source for the dry-type condenser.

An argon separation apparatus comprised with a double distillation column for liquefying and distilling air and collecting oxygen and nitrogen, and a crude argon column for withdrawing argon-containing oxygen from the lower pressure column of the double distillation column, distilling the withdrawn argon-containing oxygen and collecting crude argon;

• wherein,
• the crude argon condenser for the crude argon column is a dry-type condenser, the liquefied air is withdrawn from a plate which is higher than the bottom of the higher pressure column of the double distillation column, and a duct line is provided for sending the liquefied air to flow passage of the dry-type condenser for cold medium.

An argon separation apparatus comprised with a double distillation column for liquefying and distilling air and collecting oxygen and nitrogen, a crude argon column for withdrawing argon-containing oxygen from the lower pressure column of the double distillation column, and distilling the withdrawn argon-containing oxygen to obtain crude argon, and a deoxidation column into which the crude argon obtained from the crude argon column is introduced, and distilled to remove oxygen to obtain deoxidized argon;

• wherein,
• the condenser for the deoxidation column is a dry-type condenser, the liquefied air is withdrawn from a plate which is higher than the bottom of the higher pressure column of the double distillation column, and a duct line is provided for sending the liquefied air to flow passage of the dry-type condenser for cold medium.

An argon separation apparatus comprised a double distillation column for liquefying and distilling air and collecting oxygen and nitrogen, an crude argon column for withdrawing argon-containing oxygen from the lower pressure column of the double distillation column and distilling the withdrawn argon-containing oxygen to obtain crude argon, a deoxidation column into which the crude argon obtained at the crude argon column is introduced and distilled to remove the oxygen to obtain deoxidized argon, and a pure argon column into which the deoxidized argon obtained at deoxidation column is introduced and distilled to obtain highly pure argon;

• wherein,
• the condenser for the pure argon column is a dry-type condenser, the liquefied air is withdrawn from a plate which is higher than the bottom of the higher pressure column of the double distillation column, and a duct line is provided for sending the liquefied air to flow passage of the dry-type condenser for cold medium.

An argon separation apparatus comprising a double distillation column for liquefying and distilling air and collecting oxygen and nitrogen, and an argon column for withdrawing argon-containing oxygen from the lower pressure column of the double distillation column, distilling the withdrawn argon-containing oxygen and collecting deoxidized argon;

• wherein,
• the argon condenser for the argon column is a dry-type condenser, which his provided above the argon column, the liquefied air is withdrawn from a plate which is higher than the bottom of the higher pressure column of the double distillation column, and a duct line is provided for sending the liquefied air to a flow passage of the dry-type condenser for cold medium.