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NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEPOXIDATIONSYSTEMSHUTDOWNTOSTANDBYGUIDELINENOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEpoxidationSystemShutdowntoStandbyPURPOSEThepurposeofthisprocedureistoplacetheEpoxidationSystemintotalrefluxintheeventofatemporarystoppageoffeedandeffluentflows.TheactofplacingthesystemintotalrefluxistoapplytheproperofamountofreboilersteamflowtocreateenoughvaporsintheoverheadsystemtomaintainasteadyandcontinuousrefluxflowratewhiletherefluxdrumlevelcontrollerisinAutomaticcontrol.CONDITIONSAtemporarylossoffeedfromupstreamequipmentoratemporarystoppageofeffluenttodownstreamequipmenthasoccurred.Inashutdowntostandbycondition,onlythecontrolvalveswillbeclosedusingthevalve'scontrollerunlessacontrolvalveissuspectedofleakingthrough.Inthosespecialcases,ablockvalvewillhavetobemanuallyclosedtoeliminatetheleakage.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEpoxidationSystemShutdowntoStandbyGUIDELINE•VerifyHighpressureTBAflushflowto01E0210usingFE-23201AA/B.•RaisesetpointonTC-23230to129°C.•MonitortempsonIsothermalsreactorsandAdiabaticreactorsTC-23281AthroughJandTC-24787AthroughJandkeeptempsabovethepermissives.•VerifyHS-23214isclosedTBHPfrom01T0204.•VerifyHS-23202isclosedLowpressureTBA.•VerifyHS-23215isclosedfreshcatalyst.•VerifyHS-23216isclosedthedischargeofthe01P0218-A/B.•VerifytheHighpressureflushtothelastfiveinjectionpointsareclosedFC-23201B,FC-23201C,FC-23201D,FC-23201E,andFC-23201F.•VerifytheTBHPbreakthroughisfallingusingAI-24719AAandAI-25187B.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEpoxidationSystemShutdowntoStandby•MonitorpropyleneflowandrecycleflowattheEpoxidationRecycleJetPumps01J0217-A/BusingFC-23213A,FC-23213B,FC-23286A,andFC-23286B.•MonitortheHighPressureTBAFlushattheEpoxidationRecycleJetPumps01J0217-A/BusingFI-23201JDandFI-23201JE.•VerifyPropyleneRecycleEpoxidationFeedPump01P0225-A/Bisrunning.•MonitorsteamflowontheSecondStageFeedPreheater01E0235preheaterbyusingFC-25130.•MonitorpressureonEpoxidationFirstStageReactionSystemusingPC-23283ifpressurefallstolowminimumflowbypassaroundPC-23283mayneedtobeblockedin.•MonitorpressureonEpoxidationSecondStageReactionSystemusingPC-26201ifpressurefallstolowminimumflowbypassaroundPC-26201mayneedtobeblockedin.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEpoxidationSystemShutdowntoStandby•Monitor1stStagePreflashColumnrefertoEpoxidationFirstStageSeparationSystemOperationandOperatingVariables.•Monitor1stStagePrimaryFractionatorrefertoEpoxidationFirstStageSeparationSystemOperationandOperatingVariables.•Monitor2ndStagePreflashColumnrefertoEpoxidationSecondStageSeparationSystemOperationandOperatingVariables.•Monitor2ndStagePrimaryFractionatorrefertoEpoxidationSecondStageSeparationSystemOperationandOperatingVariables.RefertoPropyleneRecoverySystemShutdowntoStandby.