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1、InertGasPurificationSystems-VacuumAtmospheresCompany：惰性气体净化系统-真空环境公司Whydoweneedthem???Manyofthematerialsusedinresearchanddevelopmenttodayareextremelyairsensitive,andcanbedangerousinthepresenceofair.Purifiersaredesignedtoremoveoxygen,moistureandnitrogen/hydrogenfromaniner
2、tgastoonepartpermillion.Safetyisalsoacriticalissueinexperimentsandresearchtoday.PurifierComponentsCirculationblowerCoppercatalystMolecularSieveVacuumpumpSolenoidAssemblyPressurecontrolRegenerationcontrolManualfootswitchIsolationvalves(automaticormanual)Solventremovalsyst
3、emsTitaniumreactor(inthecaseofN2/H2removal)ExhausttrapsMoistureremovalMoistureisremovedbyamolecularsieveenclosedinthesamecontainerastheoxygenreactant.Alsoremovedbythemolecularsieveatambienttemperaturesarecarbondioxide,nitrogendioxide,hydrogensulfide,carbonmonoxideandmany
4、organiccompoundsincluding:Alcohols,aromatics,amines,halogenatedcompounds,oxygenatedcompounds,hydrocarbonsandorganicacids.RegenerationTheoryTorestorethepurificationcapabilityofthematerialtworeactionsmusttakeplace.TheH2Otrappedbythesievemustberemovedcompletely.TheO2mustber
5、emovedfromtheQ5reactantbyreductionusinghydrogenandheat.Regenerationtheory(cont.)Therestorationofthesieveisaccomplishedbyheatingthematerialtovaporizethewater.Adrygasispassedoverthesievethatcarriesthewatervaporoutofthecolumn.RestorationofthetheQ5isaccomplishedbypassingaH2r
6、ichgasthroughthehotreactant.TheH2reactswiththesaturatedreactanttoformmetallicCuandH20.Thewateristhenpumpedout.MaterialsthatcandamagethepurifierIngeneral,anychemicalthatreactswithcoppertoformamorestablecompoundthancopper(II)oxidewilldamagetheoxygenreactant.Volatilecompoun
7、dscontainingsulfurorhalogensarethemostcommonofthistype.Also,alcohols,phosphenes,arsines,arsinate,andmercuryvapormayalsodamagetheoxygenreactant.Ifanyofthesematerialsaretobeusedinlargequantities,asuitabletrapshouldbeinstalled.Organicsolventswillalsodamagethemolecularsievew
8、ithlongtermexposure.SelectingapurifierConsider!ThesizeoftheGlove-boxDeterminetheleakratesifapplicableCa
