siemens Applied Automation CS_Process_Analytics_in_PP_Plants[1].pdf

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1、©SiemensAG2007ProcessAnalyticsinPolypropylene(PP)PlantsPolypropylenePolypropylene(PP)isagenericnameforafamilyofsemicrystallinepolymers.PP,aswellaspolyethyl-ene(PE),belongstothegroupofpolyolefins,thatarederivedfromagroupofbasechemicalsknownasolefins.Polyolefinsaremadebyjoiningtogethersmallmolecul

2、es(monomers)toformlong-chainmolecules(polymers)withthou-sandsofindividuallinksusingavarietyofcatalysts.ThebasemonomerforPPispropy-December2007·lene,whichisagasatroomtemper-ature,butwhenlinkedtogetheraspolymers,itformstough,flexibleplasticmaterialswithalargevarietyofapplications.Thelinkingofmole-

3、culesisreferredtoaspolymeriza-tion.TherearevariouscommercialtechnologiesusedtomanufactureCaseStudypolypropylene.Eachtechnologyproducesuniquecombinationsofpolymercharacteristics.Polyolefins(PolyethyleneandPolypropylene)aretheworld‘smostlyproducedandfastestgrowingpolymerfamilybecause·modernpolyole

4、finscostlesstoproduceandprocessthanotherplasticsorconventionalmaterials·polyolefinsareavailableinmanyvarieties.Theyrangefromrigidmaterials,whichareusedforcarparts,tosoftmaterialssuchasflexiblefibres.Someareasclearasglass;othersarecompletelyopaque.Some,suchasmicro-wavefoodcontainers,havehighheatr

5、esistancewhileothersmelteasily.FortheproductionofpolypropyleneSiemens,aleaderinprocessanalyticalavarietyofprocessesisinuseinstrumentation,hasprovenoverdependingonwhatfinalproductsaredecadesitscapabilitytoplan,engi-intendedtobeproduced.However,neer,manufacture,implementandregardlessoftheprocessty

6、pe,allserviceanalyzersystemsforpolypro-plantsrequireprocessanalyticalpyleneplantsworldwide.equipmenttocollectreliableandThisCaseStudyprovidesanover-accurateinformationforprocesscon-viewoftheprocessestypicallyusedtrol,productquality,plantsafetyandanddescribeshowSiemenswithitsenvironmentalcomplian

7、ce.analyzerandapplicationknow-howmeetsbesttheprocessrequirements.©SiemensAG2007PolypropyleneproductionprocessesPolypropyleneProductionProcessesGas-PhasePolymerizationismadeinapolymerizationreactionbyVariousproductionprocesse