14MTBE-AREA-SD-T&I-543

1、NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEMTBEAREASHUTDOWNTOT&IPurposeAshutdowntoT&IoftheMTBEAreaiswhenthecolumnfeedhasstopped,thesteamtothereboilerisstopped,alllevelsarepumpeddowntolessthan10%,andallpumpsareshutdown.Allvalvestoandfromthesystemaretobemanuallyclosed.AshutdowntoT&IisdonepriortoMTBEAreaclearingandsafingprocess.ConditionsThePeroxidationSystem,。

2、EpoxidationSystemandtheTBAPurificationAreaisshutdown.MaintenanceisrequiredontheMTBESystem.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEGUIDELINE•NotifyOperatorsthatashutdownofMTBEUnitisimpending.•ReduceTBATank(OSBL)inventory(level)toalevelpre-determinedbysupervision.•ReducefeedtoMTBEUnittoapproximately33,000to44,000Kg/hrbycuttingfeedtounitby1,100Kg/hreveryhour.•MonitorMeOH/TBAratiocontrollertomaintainproperratiowhilereducingfeedrates.•Feedbothalcoholrecycleand。

3、methanolchargethroughOne-StepReactorsfor45minutes.•BypassOne-StepReactorsafterthe45minuteintervalmentionedabove.•ENSUREcausticinjectiononfront-endFC-57043AisinAUTO/LOCAL.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•BegintoreducecausticflowasnecessaryasanalyzerandsampleresultsindicateareductionofmethylformatesintheMTBERecoveryColumnoverhead.•EnsureTV-38036Bisopen,andthatTV-38036Aisclosed,thisistoprovidecooling.•CloseFC-57030steamtopreheate。

4、r01E0569.•SwitchMTBEDryingColumnbottomstooff-spectankagewhencolumnoperationorsampleresultsindicatestreamisoff-test.•BeginreducingIBElevelinMTBEDryingColumnRefluxDrumtoapproximately20%toprepareforunitshutdown.•BegintolowerallrefluxdrumlevelsthroughoutMTBEUnittoprepareforunitshutdown.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•ShutdownMTBEFinishingReactor01R0596whenIBEdrumlevelisatminimum.•ShutdownMethanolFeedPump01P0537-A/BandIBEFeedPump0。

5、1P0543-A/BtoMTBEFinishingReactor01R0596andbegincirculatingMTBEFinishingReactortocooldown.•LowersetpointonTC-59607tocoolFinishingReactorandmonitortemperature.•NotifyControlOperatortoshutdownMTBEFinishingReactorCirculatingPump01P0533-A/Bwhenreactortemperaturesare49°Corbelow.•ShutdownTBADayTankTransferPump(OSBL).•MonitortheAlcoholRecycleColumncarefully.Itwillbeaffectedthemostwhengoingtoshutdown,theshell(steam)sideoftheAlcoholRecycleColumnoverheadCondensersmayhavetobeventedtoatmosphereduringstandbyd。

6、uetocompositionchangesinoverheadstream.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•Blockin150mmmethanolmainlineblockvalveatthebatterylimits.•Connectnitrogenhose(withanti-backflowdevice)tounitside19mmbleederatbatterylimitsblockvalveandblowmethanollineintoMeOHFeedSurgeDrum.•ClearmethanollineandanybypassesintoMTBEFinishingReactorthencloseblockvalveonmethanollinetotheMTBEFinishingReactorthencloseblockvalveonmethanollineinpiperack.•Ensuremeth。

7、anollinetoBlock1tothe2ndIC4RecycleColumnoverheadlineisclearedorhasbeencleared.•CloseMethanolFeedControlvalveLV-56917aftermethanollinehasbeenclearedintoMethanolFeedSurgeDrum01D0569.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•MonitormethanollevelinMethanolFeedSurgeDrum01D0569.•NotifyControlOperatortoSHUTDOWNMethanolFeedPump01P0523-A/BwhenmethanollevelinMethanolFeedSurgeDrum01D0569reachesminimumlevel.•NotifyControlOperatortoshutdownCausticP。

8、ump(OSBL).•Blockinfreshcausticatbatterylimits.Ensurethefollowingcausticcontrolvalveinjectionpointsare100%opentoallowfordeinventoryofcausticintosystems:•FV-57043A/BMTBEOne-StepReactoreffluentoutlet•FV-57644MeOHExtractorfeedinletline•Connectstainlesssteelflexhosewithproperanti-backflowdevicestobleedervalvetocausticinjectiontoMTBEOne-stepReactoreffluentneutralizationloopatthefirstStaticMixer.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•Conne。

9、ctnitrogenhose(withanti-backflowdevice)tounitsidebleederatbatterylimitsblockvalveandblowcausticlinesandthroughbypassesintoequipmentatallpointsaslistedabovethenblockinnitrogen.•Connectwaterhose(withanti-backflowdevice)tounitsidebleederatbatterylimitsblockvalveandblowcausticlinesandthroughbypassesintoequipmentatallpointsaslistedabovethenblockinwater.•Connectnitrogenhose(withanti-backflowdevice)tounitsidebleederatbatterylimitsblockvalveandblowcausticlinesandbypassestogradeuntildry.•Reducesteamflowt。

10、oallreboilersandbegintoreducetemperaturesontowerbottoms.•Continuetodeinventoryrefluxdrumlevelsbackintotowerstoprovidecoolingfortowers.MTBEAREASHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•WhennotifiedbyConsoleOperatorbegintoblockinsteamvalvestoreboilerstocontinuetocooltowersthroughoutMTBESection.•WhennotifiedbyConsoleOperatorbegintoshutdownpumpsonstreamsthroughoutMTBESection.•EnsuretolinetheAlcoholRecycleColumnoverheadupthroughthejump-overpurgeline。