11EPOXAREA-SD2T&I---CML-531

1、NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEPOXIDATIONSYSTEMSHUTDOWNTOT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEpoxidationSystemShutdownToT&IPurposeAshutdowntoT&IoftheEpoxidationSystemisafterthesystemhasbeenflushedwithTBAforanappropriateamountoftime,whenthecolumnfeedhasstopped,thesteamtothereboilerisstopped,alllevelsarepumpeddowntolessthan10%,andallpumpsareshutdown.Allvalvestoandfromthesystemaretobemanuallyclosed.A。

2、shutdowntoT&IisdonepriortoEpoxidationSystemclearingandsafingprocess.Conditions•PriortoEpoxidationAreaShutdownensuresufficientTBAinventoriesareavailableforEpoxidationAreaStartupfromT&I.•ThePeroxidationSystemisshutdown.•MaintenanceisrequiredontheEpoxidationSystem.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEGUIDELINE•VerifythelevelsintheCatalystSolutionTanks01T0201and01T0203areapproximately10%.•PumpcontentsofoneCatalystSolutiontankintotheotherCatalystSolutiontan。

3、kandgoononetankoperationbeforeshuttingdownEpoxidationReactorSystemtoreducecatalystinventory.•ReducethelevelintheTBHPStorageTank01T0204toapproximately10%orless.•PlaceEpoxidationSysteminMode3–HotShutdown.•VerifyHigh-pressureTBAflushflowto01E0210usingFE-23201AA/AB.•VerifyHS-23214isclosedTBHPfrom01T0204.•VerifyHS-23202isclosedLowpressureTBA.•VerifyHS-23215isclosedfreshcatalyst.•PlaceEpoxidationSysteminMode10-MixDrumDe-Inventory.EpoxidationSystemShutdownToT&INOTE:ThisisforTrainingonly,andisnotintende。

4、dtobeusedasastepbystepprocedure.PO/MTBENOTE:THISISTOPUMPREMAININGTBHP/CATALYSTINTOTHEREACTORSYSTEMFROMTHECATALYSTMIXINGDRUMFORSHUTDOWN.•StartTBHP/TBAFeedPump01P0218-A/BonCatalystMixingDrumtodeinventorycontents.•AdjustFC-23216AtothefirstTBHPinjectionpointtomaintain22,680-27,216kg/hr.•MonitorCatalystMixingDrumlevelusingLC-23205whileperformingMode10-MixDrumDe-Inventory.NOTE:WHILEPERFORMINGMODE10–MIXDRUMDE-INVENTORYMODESWITCHPUMPSTOENSUREADEQUATEFLUSHOFTHEEQUIPMENTANDPIPING.•ConfirmthelevelintheCata。

5、lystMixingDrumis50%usingLC-23205toverifyadequateflush.•ConfirmshutdownoftheTBHP/TBAFeedPump01P0218-A/BandverifyHS-23216isclosed.EpoxidationSystemShutdownToT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•Closethesteamvalveon01E0210usingHC-23230.•MonitortempsonIsothermalsreactorsandAdiabaticreactorsTC-23281A-23281JandTC-24787A-24787D.•FlushEpoxidationReactionSystemwithHPTBAFlushtodisplacereactantsfromsystemuntilTBHPanalyzersAI-24719AAandAI-25187Barebelow0.25%.N。

6、OTE:ATPNPPTBAFLUSHTIMEISAPPROXIMATELY2HOURSORLONGER.•MaintainpropylenefeedtoEpoxidation1ndStageReactionSystemduringHPTBAFlush.•MonitorpropyleneflowandrecycleflowattheEpoxidationRecycleJetPumps01J0217-A/BusingFC-23213A,FC-23213B,FC-23286A,FC-23286B.•MonitortheHighPressureTBAFlushattheEpoxidationRecycleJetPumps01J0217-A/BusingFI-23201JDandFI-23201JE.•MaintainpropylenefeedtoEpoxidation2ndStageReactionSystemduringHPTBAFlush.EpoxidationSystemShutdownToT&INOTE:ThisisforTrainingonly,andisnotintendedtob。

7、eusedasastepbystepprocedure.PO/MTBE•Closethesteamvalveon01E0235preheaterusingHC-25130.•MonitorpressureonEpoxidationFirstStageReactionSystemusingPC-23283andifpressurefallsbelowminimumblockintheminimumflowbypassaroundPC-23283.•MonitorpressureonEpoxidationSecondStageReactionSystemusingPC-26201andifpressurefallsbelowminimumblockintheminimumflowbypassaroundPC-26201.•Monitor1stStageand2ndStageSeparationSystemswhileshuttingdown.•FlushsystemsuntiltheTBHPislessthan2%bysamplingreactoreffluentoutletatrouti。

8、nesamplingpoints.•LowerthesetpointonEpoxidationPropyleneStorageDrum01D0240totarget15%usingLC-23663.•ClosecontrolvalveFC-23663freshPropylenefromOSBL.•ShutdowntheHPFirstStagePropyleneFeedPump01P0216-A/B/Cwhendrumlevelreaches15%.EpoxidationSystemShutdownToT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•ShutdownPropyleneRecycleEpoxidationFeedPump01P0225-A/B.•VerifythePeroxidationReactorsareshutdownandhavebeenflushedtolessthan2%TBHP.•Aspropylenefeedisreducedandsto。

9、ppedintheEpoxidationprocessbeginshuttingdownthePropyleneRecoveryColumnandthePropyleneRecycleColumn.•PlacespareOSBLHPTBAFlushPumpintheoffposition.NOTE:BEFOREREDUCINGPRESSUREONTHEHPTBAFLUSHSYSTEM,ENSURETHATTBAFLUSHISNOTBEINGUSEDINPEROXIDATIONAREA.DONOTREDUCEPRESSUREONHPANDLPTBAFLUSHSYSTEMSBELOWPRESSUREOFSYSTEMSTHATHAVENOTBEENISOLATEDBYMANUALGATEVALVEFROMTHETBAFLUSHSYSTEM.•WhenitisverifiedthatuseofTBAflushisnolongerneededandallusershavebeenisolatedbymeansofmanuallyblockingvalves,lowerthepressureont。

10、heHPTBAflushheaderbyslowingdowntheOSBLHPTBAFlushpumpturbine.EpoxidationSystemShutdownToT&INOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBE•ShutdownOSBLHPTBAFlushPump.•ShutdownthePrimaryFractionatorVaporCompressor01K0201.•ClosecontrolvalvePV-23283onthefeedtothe1stStagePreflashColumn.•Verifymake-upPOtothe1stStagePreflashisclosedusingFC-25673.•Shutdowntherefluxpumps01P0237-A/Bonthe1stStagePreflashColumnwhentowerconditionsallow.•Aspressurefallson1stStagePreflashColumn。