| 摘要 |
PURPOSE: To increase recovery of argon by reducing the pressure of the feed gas to the argon sidearm column across a control valve and operating the argon sidearm column at the lowest possible pressure consistent with a minimum temperature difference across the overhead condenser and the unrestricted return of crude oxygen vapor from the overhead condenser to the low pressure column. CONSTITUTION: A side stream 301 is removed from the lower central position of a low pressure column 323 and fed to the lower section of an argon column 303 by reducing the pressure across a control valve 302. Residual liquid is returned from the column 303 through a pipe line 305 back to the column 323 at same inclination position as the side stream 301. Overhead argon is removed from the argon column through a pipe line 307 and condensed by a condenser 309. It is then removed through a pipe line 311 and divided into two. First part is returned through a pipe line 315 back to the top of the column 303 and the second part is removed, as a crude argon product, through a pipe line 313. Crude liquid oxygen is fed to a peripheral water pool condenser 309 from which crude oxygen is fed to the column 323 through a pipe line 319.
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