RECOVERY OF KRYPTON AND XENON FROM LIQUID OXYGEN

• Main Authors: ALAN D. BERGER, DONN MICHAEL HERRON, LUO XUKUN
• Format: Patent
• Language: Chinese; English
• Published: 22.06.2021
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

Xenon and/or krypton is separated from a liquid oxygen stream comprising oxygen and xenon and/or krypton in a process comprising providing at least a portion of the liquid oxygen stream as a reflux liquid to the top of a rare gas recovery column operated at a pressure of between 5 to 25 bara, vaporizing a reboiler liquid in the reboiling zone in the bottom of the rare gas recovery column to produce a mixture of a rising vapor and a xenon and/or krypton-enriched liquid stream; and contacting the rising vapor with the reflux liquid in at least one distillation zone of the column to effect stripping xenon and/or krypton from the rising vapor to the reflux liquid. The process provides a recovery of xenon of greater than 90% and a krypton recovery of 15% to 90%. 在一种方法中，氙和/或氪从包含氧和氙和/或氪的液态氧流中分离，该方法包括：将至少一部分液态氧流作为回流液体提供给在5至25巴之间的压力下操作的稀有气体回收塔的顶部；在稀有气体回收塔的底部的再沸区中蒸发再沸器液体，以产生上升的蒸气和富含氙和/或氪的液体流的混合物；以及在塔的至少一个蒸馏区中使上升的蒸汽与回流液体接触，以实现将氙和/或氪从上升的蒸汽汽提至回流液体。该方法提供了大于90％的氙回收率和15％至90％的氪回收率。