欢迎来到天天文库
浏览记录
ID:9971722
大小:139.00 KB
页数:9页
时间:2018-05-17
《埃克森公司的应对方案-数模案例》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、案例分析报告课程名称数据、模型与决策案例名称埃克森公司的应对方案Case2:Exxon’sResponsetotheRegulationsAsaresultofseveralmajorstudiesconductedbytheEnvironmentalProtectionAgency,thefederalgovernmenthasissuedregulationsmandatingagradualphaseoutoftetraethyllead(TEL)forgasolinesoldintheUnitedStates.Separatelegislationdev
2、elopedbythestateofCaliforniaprovidedevenstifferlimitsfortheTELcontentofgasoline.ForyearsrefinershadusedTELasanadditiontogasolineasacheapandconvenientwaytoimprovetheoctaneratingofthegasoline,thusreducingthepotentialforharmtomotorvehicleengines.IntheabsenceofTEL,arefinerymustreprocesss
3、omeofthelow-octanecomponentsofgasolinetoincreasetheiroctaneratings.Thiscanbeaccomplishedeitherbybreakingapartthehydrocarbonchains,throughprocessesknowninthetradeas“catcracking”or“hydrocracking,”orbyrearrangingthebondinginthechainsthroughprocessescalledreformingoralkylation.Allfourpro
4、cessesareverycostlyandefficientbutprovidemorevariabilityinresultsthanthesimpleadditionofTELtoimprovetheoctaneratingofablend.FacedwiththedualimpactoffederalregulationsonTELandthemorestringentCalifornialimits,officialsatExxon’sBenicia,California,refineryinitiatedacrashprogramtodetermin
5、ethemostefficientmeansofaddressingthenewrequirements.ExperimentswereundertakenusingeachofthefourknownmethodsofincreasingoctaneratingswithoutexceedingmandatedlimitsontheuseofTEL.IntheirstudygasolinefromExxon’sBeniciarefinerywasreprocessedinawaysuchthatcostswereequalizedbyusingeachexpe
6、rimentalprocedure.Thedatainthetableshowtheoctaneratingsresultingfromtheapplicationofthefourreprocessingprocedurestogasolinederivedfromeachofeightstoragetanks.OctaneRatingWhenReprocessingbyStorageTankCatCrackingHydrocrackingReformingAlkylation189.488.695.589.6288.391.394.090.2387.288.
7、286.790.0489.889.087.588.9590.188.990.790.2687.788.894.892.5784.686.087.387.1888.389.191.592.01.Dothesedatasuggestthatadifferenceexistsintheabilityofthefourreprocessingprocedurestoincreaseoctaneratings?2.Doesadifferenceexistbetweentheoctaneefficiencyofprocessesthatbreakapartthehydroc
8、arbonchains(
此文档下载收益归作者所有