聚乙烯工艺描述英文.docx

聚乙烯工艺描述英文.docx

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聚乙烯工艺描述英文

UNIPOL PEProcessDescription

UNIPOL PE工艺描述

TableofContents

PROCESSDESCRIPTION

1.1  ContractPlantComposition

  1.1.1  PEProcessUnit

  1.1.2  SupportingFacilities

  1.1.3  AuxiliaryFacilities

1.2  ProcessIntroduction

  1.2.1  DescriptionofPEProcessUnit

  1.2.2  DescriptionofSupportingFacilities

  1.2.3  DescriptionofAuxiliaryFacilities

工艺描述

1.1 装置组成

   1.1.1PE工艺单元

   1.1.2配套设施

   1.1.3辅助设施

1.2 工艺介绍

   1.2.1PE工艺单元描述

   1.2.2配套设施描述

   1.2.3辅助设施描述

1.1  ContractPlantComposition

TheContractPlantproduces300,000TPYofpelletedLinearLow,Medium,andHighDensityPolyethylenefromethylene,whichmayinvolvetheadditionofacomonomer（butene-1orhexene-1）forsomeProducts. TheContractPlantBatteryLimitsisrepresentedinthediagramprovidedinAttachment11ofthisAppendix. TheContractPlantconsistsofthefollowingsystems.

1.1合同装置组成

本合同装置是用乙烯为单体，可能会引入丁烯-1 或己烯-1 为共聚单体来生产高、低、中密度聚乙烯树脂的装置，产能为30万吨/年。

合同装置界区范围见本附件的附录1-1。

本合同装置由下列系统组成：

1.1.1  PEProcessUnit

ThePEProcessUnitutilizesUnivationTechnologies’UNIPOL™PEProcess,alowpressuregasphasepolymerizationprocess,andincludesthefollowingprocesssystems:

  RawMaterialSupplyandPurification

  EthylenePurification

  Reaction（includescatalysthandlingandfeeding）

  ResinDegassing

  VentRecovery

  SeedBedSystem

  ResinAdditiveHandling

  Pelleting

1.1.1PE工艺单元

  PE工艺单元采用Univation技术公司的UNIPOL聚乙烯技术，这是一种低压气相聚合工艺，包括下列工艺系统：

      --原料供给和精制

     --乙烯精制

      --反应（包括催化剂处理和进料）

      --树脂脱气

      --排放气回收

      --种子床系统

      --树脂添加剂处理

      --造粒

1.1.2  SupportingFacilities

TheSupportingFacilitiesforthePEProcessUnitincludethefollowingprocesssystems:

  ResinHandlingSystem

1.1.2配套设施

  PE工艺单元的配套设施包括下列系统：

      --树脂处理系统

1.1.3  AuxiliaryFacilities

TheAuxiliaryFacilitiesforthePEProcessUnitincludethefollowingprocesssystems:

  SteamandCondensateRecoverySystem

  FlareSystems

  WasteWaterCollectionandPretreatmentSystem

  UtilityDistributionSystem

1.1.3辅助设施

  PE工艺单元的工艺辅助设施包括下列系统：

      --蒸汽和冷凝水回收系统

      --火炬系统

     --废水收集和预处理系统

      --公用工程配送系统

1.2  ProcessIntroduction

ThedesignofthePEProcessUnitwillincorporatethelatestUNIPOLPEProcessKnow-how.1.2 工艺介绍

  山西焦化聚乙烯装置的设计将采用最新的UNIPOLPE工艺技术。

1.2.1  DescriptionofthePEProcessUnit

ThePEProcessUnitcomprisesanumberofprocesssystems,whicharedescribedindetailinthefollowingsections:

  RawMaterialSupplyandPurification（Part1）

  EthylenePurification（Part2）

  Reaction（Part4）

  ResinDegassing（Part5A）

  VentRecovery（Part5B）

  SeedBedSystem（Part5E）

  ResinAdditiveHandling（Part6）

  Pelleting（Part7）

ProcessFlowDiagrams（PFDs）thatrepresenttheseprocesssystemsareprovidedinAttachment12ofthisappendix.

AlloftheequipmentdescribedinthefollowingprocessdescriptionisincludedinthepreliminaryequipmentlistprovidedinAppendix5.

1.2.1PE工艺单元描述

  PE工艺单元由一系列工艺系统组成，下面对这些系统进行详细描述：

     原料的供应和精制（第1部分）

     乙烯的精制（第2部分）

     反应（第4部分）

     树脂脱气（第5A部分）

     排放气回收（第5B部分）

     种子床系统（第5E部分）

     树脂添加剂处理（第6部分）

     造粒（第7部分）

  工艺流程图（PFD）附于本附件的附录1-2。

  下面工艺描述中涉及的所有设备见附件5中的初步工艺设备清单。

RawMaterialSupplyandPurification（Part1）

NitrogenandhydrogenaredeliveredtotheContractPlantBatteryLimitsbypipeline.

Comonomers,butene1andhexene1,andInducedCondensingAgent（ICA）,isopentane,aresuppliedtotheContractPlantbypipeline. IthasbeenassumedthatsufficientstoragecapacityisavailablefromtheOutsideBatteryLimits（OSBL）forbutene1,hexene1,andICA.

CocatalystalkylisreceivedinshippingcontainersforusedirectlyinthePEProcessUnit.

ComonomerPurification

Acommonpurificationsystemisprovidedforthetwocomonomers-butene1andhexene1. LiquidcomonomerfromtheBatteryLimitsisfeddirectlyintotheComonomerDegassingColumn（C1008）. Thecolumn,whichismountedontheComonomerSurgeTank（C1007）,isequippedwithwatercooledComonomerCondenser（E1009）andsteamheatedComonomerReboiler（E1010）. Asmallstreamofoverheadgas,containingstrippedlightgascontaminantsventstotheflare. ThebottomproductfromtheComonomerSurgeTankpassesthroughComonomerCooler（E1011）. Thecooler’sprimarypurposeistoprovideadequateNPSHfortheComonomerChargePump（G1002orG1003,aninstalledspare）. TheComonomerChargePumpbooststhecomonomerpressuretoapproximately2,861kPag（415psig）forflowintotheReactor. FromtheComonomerChargePump,comonomerflowsthroughtheComonomerDryer（C1004orC1005）toremovewaterandotherpolarimpuritiesfromthecomonomerstreambyphysicaladsorption. Themolecularsievebedsrequireperiodicregenerationwithhotnitrogen. ThespareComonomerDryerisusedwhiletheotherisbeingregenerated,thusallowinguninterruptedcomonomerflow.

NitrogenPurification

NitrogenfromtheBatteryLimitspassesthroughtheNitrogenPreheater（E1108）beforeenteringtheNitrogenDeoxoVessel（C1109orC1111）. TheNitrogenDeoxoVesselcontainsafixedbedoffreecoppercatalystwhichremovesoxygenfromthenitrogenstreambyoxidationofcoppertocopperoxides. Thecatalystbedrequiresperiodicregenerationwithastreamofhydrogendilutedinhotnitrogen. NitrogenleavingtheNitrogenDeoxoVesselisfedtotheNitrogenDryer（C1112）. TheNitrogenDryercontainsmolecularsieveswhichremovewaterandotherpolarimpuritiesfromthenitrogenstreambyphysicaladsorption. Themolecularsievebedrequiresperiodicregenerationwithhotnitrogen. ThespareNitrogenDryerisusedwhiletheotherisbeingregenerated,thusallowinguninterruptednitrogenflow.

HighpressurepurifiednitrogenisutilizedintheReactionSystem,whilelowpressurepurifiednitrogenissuppliedtovariousplacesthroughoutthePEProcessUnit. PurifiednitrogentobecompressedforuseintheReactionSystemistakenfromtheoutletoftheNitrogenDryer. ThepressureisboostedbyNitrogenCompressorPackage（K1102）toapressureofabout3,309kPag（480psig）. ThehighpressurepurifiednitrogenthenpassesthroughPurifiedNitrogenFilter（Y1114）andflowsontotheReactionSystem.

HydrogenPurification

HydrogensupplyfromtheBatteryLimitsispreheatedintheMethanatorHeater（E1204）beforeenteringtheMethanator（C1205）. TheMethanatorcontainsafixedbedofcatalystwhichconvertscarbonmonoxideandcarbondioxideinthepresenceofhydrogentoformmethaneandwater. HydrogenleavingtheMethanatoriscooledintheMethanatorAftercooler（E1206）toapproximately40degCandisfedtotheHydrogenDryer（C1207）. TheHydrogenDryercontainsmolecularsieveswhichremovewaterfromthehydrogenstreambyphysicaladsorption. Themolecularsievebedrequiresperiodicregenerationwithhotnitrogen. TheHydrogenDryerisbypassedwhilebeingregenerated,thusallowinguninterruptedhydrogenflow.

HydrogenfromtheHydrogenDryerisfedtotheReactionSystemortothedeoxovesselswithinthePurificationSystem.

ICAPurification

TheUNIPOLPEProcessusesisopentaneasanInducedCondensingAgent（ICA）withintheReactionSystemtoenhanceheatremoval. IsopentanefromtheBatteryLimitsisfeddirectlytotheICADegassingColumn（C1421）. Thecolumn,whichismountedontheICASurgeTank（C1406）,isequippedwithwatercooledICACondenser（E1422）andsteamheatedICAReboiler（E1415）. Asmallstreamofoverheadgas,containingstrippedlightgascontaminantsisventedtoflare. ThebottomproductfromtheICASurgeTankpassesthroughtheICACooler（E1423）. TheprimarypurposeofthecooleristoprovideadequateNPSHfortheICAChargePump（G1412orG1413,aninstalledspare）. TheICAChargePumpboostsICApressuretoapproximately3,137kPag（455psig）forflowintotheReactor. FromtheICAChargePump,theICAflowsthroughtheICADryer（C1419orC1420）toremovewaterandotherpolarimpuritiesfromtheICAstreambyphysicaladsorption. Themolecularsievebedsrequireperiodicregenerationwithhotnitrogen. ThespareICADryerisusedwhiletheotherisbeingregenerated,thusallowingICAflowtocontinuethroughtheICAPurificationSystem.

Alkyl

AdditiveT2,analkyl,isusedinZiegler-Nattacatalyzedpolymerizationandisconsideredtobeahazardousmaterialinsomelocationsbecauseofitsreactivenature. PurifiednitrogenisusedtopressurethealkylfromtheshippingcontainertotheT2FeedPot（C1505）andthentotheT2ChargePump（G1503orG1504,aninstalledspare）. Thesepumpspressurethealkyltoapproximately3,137kPag（455psig）forfeedtotheReactionSystem.

AllventsfromtheAdditiveT2SystemareroutedtotheSealPot（C1502）andcombinedwithmineraloiltoproducealessreactivesolution. Periodically,theSealPotcontentsaredrainedtoadisposaltankfordisposalbyanoffsitedisposalcontractor.

MineraloilispumpedfromsupplydrumsbyMineralOilDrumPump（G1514）totheSealPotfordilutionofalkyl. Alternately,theMineralOilDrumPumpmaybeusedtotransfermineraloilfromthesupplydrumstotheMineralOilBlowTank（C1512）. MineraloilfromtheMineralOilBlowTankisusedforflushingtheAdditiveT2Systemformaintenance.

原料的供应及精制（第1部分）

  氮气和氢气由管道输送至装置界区内。

  共聚单体（丁烯-1、己烯-1）及诱导冷凝剂（ICA）（异戊烷）由界区内的配套设施提供。

假定装置界区外有足够的丁烯、己烯及诱导冷凝剂（ICA）储存。

  助催化剂烷基铝用钢瓶直接运至PE工艺单元。

共聚单体的精制

  两种共聚单体——丁烯-1 和己烯-1 共用一个精制系统。

来自界区的液相共聚单体直接送入共聚单体脱气塔（C-1008）。

脱气塔位于共聚单体缓冲罐（C-1007）之上，塔顶有一个水冷的共聚单体冷凝器（E-100