聚乙烯工艺描述英文.docx

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聚乙烯工艺描述英文.docx

聚乙烯工艺描述英文

 

UNIPOLPEProcessDescription

UNIPOLPE工艺描述

 

TableofContents

PROCESSDESCRIPTION

 

1.1ContractPlantposition

1.1.1PEProcessUnit

1.1.2SupportingFacilities

1.1.3AuxiliaryFacilities

1.2ProcessIntroduction

1.2.1DescriptionofPEProcessUnit

1.2.2DescriptionofSupportingFacilities

1.2.3DescriptionofAuxiliaryFacilities

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

 

1.1ContractPlantposition

TheContractPlantproduces300,000TPYofpelletedLinearLow,Medium,andHighDensityPolyethylenefromethylene,whichmayinvolvetheadditionofaonomer(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X围见本附件的附录1-1。

本合同装置由下列系统组成:

1.1.1PEProcessUnit

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

1.1.2SupportingFacilities

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

1.1.3AuxiliaryFacilities

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

1.2ProcessIntroduction

ThedesignofthePEProcessUnitwillincorporatethelatestUNIPOLPEProcessKnow-how.1.2工艺介绍

XX焦化聚乙烯装置的设计将采用最新的UNIPOLPE工艺技术。

1.2.1DescriptionofthePEProcessUnit

ThePEProcessUnitprisesanumberofprocesssystems,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.

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

CocatalystalkylisreceivedinshippingcontainersforusedirectlyinthePEProcessUnit.

onomerPurification

Amonpurificationsystemisprovidedforthetwoonomers-butene1andhexene1.LiquidonomerfromtheBatteryLimitsisfeddirectlyintotheonomerDegassingColumn(C1008).Thecolumn,whichismountedontheonomerSurgeTank(C1007),isequippedwithwatercooledonomerCondenser(E1009)andsteamheatedonomerReboiler(E1010).Asmallstreamofoverheadgas,containingstrippedlightgascontaminantsventstotheflare.ThebottomproductfromtheonomerSurgeTankpassesthroughonomerCooler(E1011).Thecooler’sprimarypurposeistoprovideadequateNPSHfortheonomerChargePump(G1002orG1003,aninstalledspare).TheonomerChargePumpbooststheonomerpressuretoapproximately2,861kPag(415psig)forflowintotheReactor.FromtheonomerChargePump,onomerflowsthroughtheonomerDryer(C1004orC1005)toremovewaterandotherpolarimpuritiesfromtheonomerstreambyphysicaladsorption.Themolecularsievebedsrequireperiodicregenerationwithhotnitrogen.ThespareonomerDryerisusedwhiletheotherisbeingregenerated,thusallowinguninterruptedonomerflow.

NitrogenPurification

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

HighpressurepurifiednitrogenisutilizedintheReactionSystem,whilelowpressurepurifiednitrogenissuppliedtovariousplacesthroughoutthePEProcessUnit.PurifiednitrogentobepressedforuseintheReactionSystemistakenfromtheoutletoftheNitrogenDryer.ThepressureisboostedbyNitrogenpressorPackage(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)andbinedwithmineraloiltoproducealessreactivesolution.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-1009)使共聚单体冷凝,塔底有一个蒸汽加热的共聚单体再沸器(E-1010)使共聚单体汽化。

塔顶脱除的少量的轻组分塔顶气被排放到火炬。

共聚单体缓冲罐的底部产品由共聚单体冷却器(E-1011)冷却。

冷却器的主要目的是为共聚单体进料泵(G-1002或G-1003,其中一个是在线备用泵)提供足够的有效气蚀余量。

共聚单体进料泵使共聚单体增压至大约2861kPag(415psig)后进入反应器。

来自共聚单体进料泵的共聚单体进入共聚单体干燥器(C-1004或C-1005),通过物理吸收作用除去共聚单体物流中的水分和其它极性杂质。

分子筛床层需要用热氮气定期再生。

当一个共聚单体干燥器进行再生时,就启用备用的共聚单体干燥器,这样可使共聚单体不间断地流入反应系统。

氮气的精制

从界区来的氮气在进入氮气脱氧罐(C-1109或C-1111)之前在氮气预热器(E-1108)中进行预热。

氮气脱氧罐含有一个游离铜催化剂的固定床,通过将游离铜氧化成氧化铜而除去氮气中的氧气。

催化剂床需要用含有少量氢气的热氮气进行定期再生。

离开氮气脱氧罐的氮气进入氮气干燥器(C-1112)。

氮气干燥器内设有分子筛,通过物理吸收作用除去氮气中的水分和其它极性杂质。

分子筛需要用热氮气定期再生。

一台氮气干燥器再生时,另外一台备用干燥器启动运行,以保证氮气持续地流入反应系统。

高压精制的氮气用于反应系统,而低压

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