| 摘要 |
<p>The inefficiency of the nitrogen stripping section of a high purity oxygen-producing air distillation plant is reduced. This allows increased recovery of byproduct argon and in some cases increased recovery of refrigeration work also. The improvement is obtained by evaporating kettle liquid with condensing argon rectifier vapor in two sequential stages, to yield vapor streams respectively having more and less O2 content than the kettle liquid, and separately feeding them to the N2 removal column. The improvement is applicable to both dual and triple pressure processes. Referring to Figure (I), kettle liquid is supplied via valve (11) to the top of contactor (18), and overhead reflux condenser (13) of argon rectifier (14) reboils the bottom of contactor (18). Vapor streams of differing O2 composition are withdrawn from above and below contactor (18).</p> |
