8MTBE-RX.SD-TO-STANDBY-599

NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBYNOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBYPurposeThepurposeofthisprocedureistoplacetheMTBEReactionSysteminstandbyandtheMTBERecoveryColumnandAlcoholRecycleColumnontotalrefluxintheeventofatemporarystoppageoffeedandeffluentflows.TheactofplacingthesystemintotalrefluxistoapplytheproperofamountofreboilersteamflowtocreateenoughvaporsintheoverheadsystemtomaintainasteadyandcontinuousrefluxflowratewhiletherefluxdrumlevelcontrollerisinAutomaticcontrol.ConditionsAtemporarylossoffeedfromupstreamequipmentoratemporarystoppageofeffluenttodownstreamequipmenthasoccurred.Inashutdowntostandbycondition,onlythecontrolvalveswillbeclosedusingthevalve'scontrollerunlessacontrolvalveissuspectedofleakingthrough.Inthosespecialcases,ablockvalvewillhavetobemanuallyclosedtoeliminatetheleakage.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBYGUIDELINERefertoprocedureMTBEFinishingReactorShutdowntoStandby.•Closecontrolvalveonsteamto01E0569MTBEReactorFeedHeaterandshutdownTBAFeedFractionatorpumpifnotalreadydown.Closecontrolvalve.Note:Catalystdamagefromhighfeedtemperatureisafastprocess,ontheorderofafewhours.•ClosecontrolvalvesonCaustictotheneutralizationloop.•Openblockvalves8Aand8BonOne-StepReactorsby-passtheOne-StepReactors.Ifreactorsareinnormaldownflowmodethisiscorrect.Needtoverifyflowdirectionandwhichreactorisinleadandsecondary.Ifeither1Aor1Bisopenwithboth8Aand8Bopen,thereactorsareby-passed..Ifreactorsareindownflowmode,theleadreactorwillhavevalves1and5open,ifleadisindownflowmodevalves2and6willbeopen.Forsecondaryreactor,ifindownflowmodevalvevalves3and7areopen,ifsecondaryreactorisinupflowvalvesnumber4and8areopen.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBYNote:Whenby-passingOne-StepReactorsitdoesnotmatterwhichreactorisinthelead,valvenumber8Aand8Bhastobeopen.Openingvalves8Aand8BwilllineuptopoutletsofbothreactorstotheMTBEOne-StepEffluentline.•ClosecontrolvalveonMethanolFeedtoOne-StepReactors.•MonitorOne-StepReactortemperatureandifproperlyby-passed,theOne-StepReactortemperaturesshouldremainconstant.NOTE:Iftemperaturesbegintorise,re-establishMethanolfeed.NOTE:One-StepReactorfeedtemperaturewillrise,butifthereactorsareproperlyby-passed,nodamagetothecatalystwilloccur.•ClosecontrolvalveonAlcoholRecycleColumnoverheadto01E0549AlcoholRecycleFeed/OverheadExchangerand01E0310-A/BTBAFeedPreheater.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBYNote:ThisistheprimarysourceofheatfortheFormateDestructionsystemduringnormaloperations.WhenstoppingARCoverheadflow,monitorFRCsystemclosely.TheARCoverheadsteamshouldbeclosedpriortocuttingoutMTBERecoverybottomsto01E0549AlcoholRecycleFeed/OverheadExchangerandbeforecuttingoutTBAfeedtounit.OnceTBAfeedisclosed,donotopenARCoverhead.•ClosecontrolvalveonMTBERecoveryColumnbottomsto01E0549AlcoholRecycleFeed/OverheadExchanger.Note:ThisstreamprovidescoolingtoARCoverheadin01E0549AlcoholRecycleFeed/OverheadExchangerduringnormaloperations.Ifrequired,feedvalvetoARCcanbereopenedtodrainMTBERecoverybottomstoARC.•MonitorTemperatureprofileof01R0570-A.•MonitorTemperatureprofileof01R0570-B.•ClosecontrolvalveonmethanolfeedtoOne-StepReactorsNOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEREACTIONSYSTEMSHUTDOWNTOSTANDBY•ClosecontrolvalveonfreshmethanoltomethanolSurgeDrum.•ClosecontrolvalveonMeOHStripperColumntoMethanolSurgeDrum.•ClosecontrolvalveonAlcoholRecycleColumnOverheadslipstreamtotheMeOHExtractor.•ClosecontrolvalveonfeedtotheMTBERecoveryColumn.•ClosecontrolvalvesontheMTBEoverheadtotheMethanolExtractor.•MonitorMTBERecoveryColumnrefertoMTBERecoverySystemOperation.•MonitorAlcoholRecycleColumnrefertoAlcoholRecycleSystemOperation.