Process and adsorbent for the recovery of krypton and xenon from a gas or liquid stream

A technology of adsorbent and adsorbent bed, applied in chemical instruments and methods, separation methods, liquefaction, etc., can solve the problem of low selectivity

Inactive Publication Date: 2007-07-18
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiAg-exchanged zeolites are said to selectively adsorb oxygen over argon, however, to a small degree; and Ag ions will strongly adsorb nitrogen

Method used

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  • Process and adsorbent for the recovery of krypton and xenon from a gas or liquid stream
  • Process and adsorbent for the recovery of krypton and xenon from a gas or liquid stream
  • Process and adsorbent for the recovery of krypton and xenon from a gas or liquid stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Oxygen and xenon adsorption isotherms were measured at 30°C on silica gel, 13X and 20% AgLiLSX. The results are listed in Table 1, which gives the Henry's law constants (starting isotherm slopes) for krypton, xenon and oxygen. The table also gives the selectivity to xenon relative to oxygen expressed as a ratio of its Henry's law constants. The silica is Grace Davison grade 40 (750m 2 / g), 13X is an APG grade from UOP and 20% AgLiLSX is produced by ion exchange of silver(I) into commercially available LiLSX.

[0083] Table 1

[0084] adsorbent

[0085] The results in Table 1 show that the introduction of silver(I) ions into the zeolite structure will greatly increase the capacity of krypton (19 times greater than 13X) and xenon (62 times greater than 13X). The table also shows that the Ag-exchanged zeolite has a particularly high xenon / oxygen selectivity. Finally, the selectivity and capacity of the silver-exchanged zeolite will be much higher than that of...

Embodiment 2

[0087] The low temperature adsorption rate of xenon from liquid argon (LAR) was measured on silica gel (Grace Davison B-411) and 40% AgLiLSX. Liquid argon containing 20 ppm of xenon was fed into an adsorber 2 inches in diameter and 20 inches in length until the xenon was completely penetrated. Liquid argon (LOX) is used as the cryogen for safety reasons in the use of liquid oxygen (LOX), and it is expected that the performance of LAR and LOX should be substantially the same. The flow rate into the adsorber is approximately 2001bmoles / ft 2 / hr(53.4kgmoles / m 2 / sec). The results of the penetration test are listed in Table 2.

[0088] Table 2

[0089] adsorbent

[0090] The results in Table 2 show that 20% AgLiLSX is a much improved adsorbent for selective adsorption of xenon from cryogenic liquids than silica gel (prior art adsorbent).

Embodiment 3

[0092] The xenon capacity of 20% AgLiLSX was determined by measuring breakthrough curves at -78°C (195K) and -160°C (113K) with 20 ppm xenon in argon at a feed pressure of 50 psig (345 kPa). The column used was 5 cm long and 3 / 8 inch (32 mm) in diameter. The test results compared with the results obtained in Example 2 are listed in Table 3.

[0093] table 3

[0094] adsorbent

[0095] The results in Table 3 are unexpected since the adsorption capacity of Xe passes a maximum value with temperature. The results also show that the recovery of the noble gas in the vapor phase is preferably performed.

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Abstract

Xenon and / or krypton are recovered from oxygen containing gas, typically derived from liquid oxygen bottoms in a cryogenic air separation plant, by selective adsorption on a Li and Ag exchange zeolite containing 5 to 40% Ag exchange capacity on an equivalents basis, with periodic thermal regeneration of the adsorbent.

Description

[0001] This application is a divisional application of the case No. 021506981 filed on November 19, 2002. Field of Invention [0002] The present invention relates to a method and adsorbent for recovering krypton and / or xenon from a gas or liquid stream, and an apparatus for an adsorption process. Background of the Invention [0003] In the years to come, it can be expected that the use of the noble gases krypton and xenon will continue to increase. Krypton is mainly used in the spherical lighting industry such as long-life lighting bulbs and automotive lamps. Xenon can be used in aerospace technology, electronics and pharmaceuticals. In the aerospace industry, xenon is used in ionic propellant technology for satellites. Xenon provides ten times the thrust of current chemical "propellants", is chemically inert and can be stored at low temperatures. This will result in lower "fuel" weight and, as a result, satellites capable of accommodating more useful equipment. It has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B23/00B01D53/02B01J20/18B01J20/10B01D53/04
CPCB01D2259/4533B01D2253/306B01D2257/11B01J20/186B01D2256/18B01D2253/304C01B2210/0045B01D2259/4575C01B2210/0035B01D2253/106C01B23/0068B01D2259/416C01B2210/0037B01D2259/40083B01D2253/108B01D53/04A61M2202/0258A61M2202/0291A61M16/0093F25J3/04757F25J2205/60
Inventor T·C·戈尔登T·S·法里斯R·L·奇昂R·D·惠特利F·W·泰勒
Owner AIR PROD & CHEM INC
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