17TBAFORMATE-DESTRUCTION-SD-TO-STANDBY-551

NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBYNOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBYPurposeThepurposeofthisprocedureistoplacetheFormateDestructionSysteminstandbyconditionintheeventofatemporarystoppageoffeedandeffluentflows.ConditionsAtemporarylossoffeedfromupstreamequipmentoratemporarystoppageofeffluenttodownstreamequipmenthasoccurred.Inashutdowntostandbycondition,onlythecontrolvalveswillbeclosedusingthevalve'scontrollerunlessacontrolvalveissuspectedofleakingthrough.Inthosespecialcases,ablockvalvewillhavetobemanuallyclosedtoeliminatetheleakage.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBYGUIDELINE•Slowlyopenshellsideby-passon01E0310-A/B,whiledoingthiscloselymonitorfeedtemperaturetotheMTBEOne-StepReactors.Astheshellsideby-passheattransferfromtheAlcoholRecycleOverheadproducttothefreshTBAfeedtotheFormateDestructionreactorswillreduce.ThiswillresultinhigherTBArecycletemperaturefromtheAlcoholRecycleColumnoverheadandlowerfeedtemperaturetotheFormateDestructionsystem.Openby-passandallowtemperaturecontroltotheMTBEOne-StepReactorstoadjust.Donotexceed121°ConMTBEOne-Stepreactorfeedtemperature,catalystdamageand/orreductionincatalystlifecouldresult.•Onceshellsideby-passisfullyopenon01E0310-A/B,slowlycloseinletvalvetoshellsideof01E0310-B.MonitorMTBEOne-Stepreactorfeedtemperaturewhileclosing.Whenshellsideinletvalveto01E0310-Bisfullyclosedandtemperatureisstableatdesiredtemperaturecontinuewithprocedure.•Closeshellsideoutletvalveon01E0310-A,oncefullyclosed,openblowdownlineon01E0310-/Bshellside.Thiswilldepressureshellsideof01E0310-A/B.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBYClosethefollowingcontrolvalves.Closevalvesbyplacingcontrolsinmanualpositionandsettingoutputtozero.Verifythatby-passvalvesaroundlistedcontrolvalvesareclosed.•FV-38090DemineralizedwaterfeedtotheFormateDestructionsystem.•FV-38091HydrogenfeedtotheFormateDestructionsystem•FV-38021TBAfeedtotheFormateDestructionsystem.WhileclosingFV-38021monitorCrudeTBAtankpumpdischargepressuretoavoidpotentialpumpdamage.WhenFV-38021isclosed,shutdownCrudeTBAtankpump.•EnsureCrudeTBATankFeedpumps,areshutdown.•CloseFV-38030onS15steamflowtoFormateDestructionHeater01E0312.LeaveLV-38029,01D0386Condensatelevelcontrolvalvelinedupinautomatic.Thisvalveshouldautomaticallycloseaslevelincondensatedrumfalls.•MonitortemperaturesinboththeFormateDestructionReactorandthePeroxDecompositionreactors.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBYNOTE:IFLOCALWEATHERCONDITIONSWARRANT(COLDWEATHER)ANDSYSTEMISTOREMAINDOWNFORANEXTENDEDPERIODOFTIME,FREEZINGOFTBACOULDOCCURINTHEFORMATEDESTRUCTIONREACTORANDTHEPEROXDECOMPOSITIONREACTOR.JUDGMENTWILLHAVETOMADEBYOPERATIONSIFFREEZINGCONCERNEXIST.THEPIPINGTOTHESEREACTORSAREELECTRICHEATTRACED,THEREACTORSARENOTELECTRICHEATTRACED.IFFREEZINGOFREACTORSISACONCERN,CLOSEINLETANDOUTLETVALVESONBOTHREACTORS,ROLLN20NITROGENELLONTOPOFBOTHREACTORSANDDEINVENTORYREACTORSINTOSYSTEM.USEN20NITROGENTOPUSHTBAINTOTHESYSTEM.ONCEBOTHREACTORSAREEMPTY,CLOSENITROGEN.KEEPBOTHREACTORSUNDERSLIGHTNITROGENPAD.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEFORMATEDESTRUCTIONSYSTEMSHUTDOWNTOSTANDBY•MonitorPC-31201TBAFeedFractionationColumnfeedbackpressurecontrolvalve.Valveshouldcloseasfeedisstoppedandsystempressuredrops.•VerifythatFV-31218isclosed.•Adjustreboilersteamflowandrefluxflowtokeep01C0312ontotalreflux.Adjustasprocessconditionswarrant.Iftotalrefluxflowisnotpossible,stopsteamflowtoreboiler,ascolumnconditionsdictate,shutdownrefluxpump.Ensurethatbottompumpisshutdown.