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A cryogenic machine for selective recovery of xenon from breathing system waste gases.

John Dingley, R Mason

Anesthesia and Analgesia, Volume: 105, Issue: 5, Pages: 1312 - 1318

Swansea University Author: John Dingley

Abstract

BACKGROUND:Xenon has many characteristics that make it very attractive as an anesthetic and therapeutic drug. Unfortunately, the supply of xenon is fixed, and therefore reclamation and recovery from even the most efficient breathing circuits is desirable. We built and evaluated a cryogenic device to...

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Published in: Anesthesia and Analgesia
Published: 2008
URI: https://cronfa.swan.ac.uk/Record/cronfa27479
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2016-04-26T22:55:34.8782527</datestamp><bib-version>v2</bib-version><id>27479</id><entry>2016-04-26</entry><title>A cryogenic machine for selective recovery of xenon from breathing system waste gases.</title><swanseaauthors><author><sid>1283ffdd09b091ec57ec3e235a48cfcc</sid><firstname>John</firstname><surname>Dingley</surname><name>John Dingley</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2016-04-26</date><deptcode>PMSC</deptcode><abstract>BACKGROUND:Xenon has many characteristics that make it very attractive as an anesthetic and therapeutic drug. Unfortunately, the supply of xenon is fixed, and therefore reclamation and recovery from even the most efficient breathing circuits is desirable. We built and evaluated a cryogenic device to recover xenon from waste anesthetic gases.METHODS:Xenon was selectively frozen to -139.2 degrees C from test gas mixtures at ambient pressure (STP). The machine ran on standard 240 V 13 A electrical current without refrigerants that required replenishing, e.g., liquid nitrogen. A wide range of xenon/oxygen mixtures were processed over a range of freezing chamber temperatures. Efflux gas and thawed reclaimed xenon were collected separately. Xenon purity and yield (fraction recovered) were measured and calculated on each occasion.RESULTS:Gas was processed at 300 mL/min, and the operating temperature was -139.2 (0.096) degrees C [Mean (sd)]. Purity and yield were &amp;#62;90% and &amp;#62;70% for gas mixtures containing &amp;#62; or =20% xenon, increasing to &amp;#62;95% and &amp;#62;85%, respectively, with an input gas xenon fraction &amp;#62; or =40%. Efficiency improved linearly with reducing temperature.CONCLUSIONS:Xenon of high purity (&amp;#62;90%) and yield (&amp;#62;70%) for such a machine was recovered from all gas mixtures containing &amp;#62; or =20% xenon. The operating temperature of the freezing chamber is a major influence on the efficiency of recovery.</abstract><type>Journal Article</type><journal>Anesthesia and Analgesia</journal><volume>105</volume><journalNumber>5</journalNumber><paginationStart>1312</paginationStart><paginationEnd>1318</paginationEnd><publisher/><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords/><publishedDay>31</publishedDay><publishedMonth>1</publishedMonth><publishedYear>2008</publishedYear><publishedDate>2008-01-31</publishedDate><doi/><url/><notes/><college>COLLEGE NANME</college><department>Medicine</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>PMSC</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2016-04-26T22:55:34.8782527</lastEdited><Created>2016-04-26T22:51:56.4414519</Created><path><level id="1">Faculty of Medicine, Health and Life Sciences</level><level id="2">Swansea University Medical School - Medicine</level></path><authors><author><firstname>John</firstname><surname>Dingley</surname><order>1</order></author><author><firstname>R</firstname><surname>Mason</surname><order>2</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2016-04-26T22:55:34.8782527 v2 27479 2016-04-26 A cryogenic machine for selective recovery of xenon from breathing system waste gases. 1283ffdd09b091ec57ec3e235a48cfcc John Dingley John Dingley true false 2016-04-26 PMSC BACKGROUND:Xenon has many characteristics that make it very attractive as an anesthetic and therapeutic drug. Unfortunately, the supply of xenon is fixed, and therefore reclamation and recovery from even the most efficient breathing circuits is desirable. We built and evaluated a cryogenic device to recover xenon from waste anesthetic gases.METHODS:Xenon was selectively frozen to -139.2 degrees C from test gas mixtures at ambient pressure (STP). The machine ran on standard 240 V 13 A electrical current without refrigerants that required replenishing, e.g., liquid nitrogen. A wide range of xenon/oxygen mixtures were processed over a range of freezing chamber temperatures. Efflux gas and thawed reclaimed xenon were collected separately. Xenon purity and yield (fraction recovered) were measured and calculated on each occasion.RESULTS:Gas was processed at 300 mL/min, and the operating temperature was -139.2 (0.096) degrees C [Mean (sd)]. Purity and yield were &#62;90% and &#62;70% for gas mixtures containing &#62; or =20% xenon, increasing to &#62;95% and &#62;85%, respectively, with an input gas xenon fraction &#62; or =40%. Efficiency improved linearly with reducing temperature.CONCLUSIONS:Xenon of high purity (&#62;90%) and yield (&#62;70%) for such a machine was recovered from all gas mixtures containing &#62; or =20% xenon. The operating temperature of the freezing chamber is a major influence on the efficiency of recovery. Journal Article Anesthesia and Analgesia 105 5 1312 1318 31 1 2008 2008-01-31 COLLEGE NANME Medicine COLLEGE CODE PMSC Swansea University 2016-04-26T22:55:34.8782527 2016-04-26T22:51:56.4414519 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine John Dingley 1 R Mason 2
title A cryogenic machine for selective recovery of xenon from breathing system waste gases.
spellingShingle A cryogenic machine for selective recovery of xenon from breathing system waste gases.
John Dingley
title_short A cryogenic machine for selective recovery of xenon from breathing system waste gases.
title_full A cryogenic machine for selective recovery of xenon from breathing system waste gases.
title_fullStr A cryogenic machine for selective recovery of xenon from breathing system waste gases.
title_full_unstemmed A cryogenic machine for selective recovery of xenon from breathing system waste gases.
title_sort A cryogenic machine for selective recovery of xenon from breathing system waste gases.
author_id_str_mv 1283ffdd09b091ec57ec3e235a48cfcc
author_id_fullname_str_mv 1283ffdd09b091ec57ec3e235a48cfcc_***_John Dingley
author John Dingley
author2 John Dingley
R Mason
format Journal article
container_title Anesthesia and Analgesia
container_volume 105
container_issue 5
container_start_page 1312
publishDate 2008
institution Swansea University
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine
document_store_str 0
active_str 0
description BACKGROUND:Xenon has many characteristics that make it very attractive as an anesthetic and therapeutic drug. Unfortunately, the supply of xenon is fixed, and therefore reclamation and recovery from even the most efficient breathing circuits is desirable. We built and evaluated a cryogenic device to recover xenon from waste anesthetic gases.METHODS:Xenon was selectively frozen to -139.2 degrees C from test gas mixtures at ambient pressure (STP). The machine ran on standard 240 V 13 A electrical current without refrigerants that required replenishing, e.g., liquid nitrogen. A wide range of xenon/oxygen mixtures were processed over a range of freezing chamber temperatures. Efflux gas and thawed reclaimed xenon were collected separately. Xenon purity and yield (fraction recovered) were measured and calculated on each occasion.RESULTS:Gas was processed at 300 mL/min, and the operating temperature was -139.2 (0.096) degrees C [Mean (sd)]. Purity and yield were &#62;90% and &#62;70% for gas mixtures containing &#62; or =20% xenon, increasing to &#62;95% and &#62;85%, respectively, with an input gas xenon fraction &#62; or =40%. Efficiency improved linearly with reducing temperature.CONCLUSIONS:Xenon of high purity (&#62;90%) and yield (&#62;70%) for such a machine was recovered from all gas mixtures containing &#62; or =20% xenon. The operating temperature of the freezing chamber is a major influence on the efficiency of recovery.
published_date 2008-01-31T03:33:19Z
_version_ 1763751387769864192
score 11.036531

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