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简介：介绍了一种2，2－二氯六氟丙烷一元氢解生成2－氯－2－氢六氟丙烷的方法，其过程为：在有效量的负载于三价氧化铬上的钯催化剂及HZ型酸（Z为Cl或F）存在下，于150℃以下的高温下，将2，2－二氯六氟丙烷与氢气反应，生成2－氯－2－氢六氟丙烷，以转化掉的2，2－二氯六氟丙烷计，反应的选择性可达70％以上，还介绍了2－氯－2－氢六氟丙烷与HF形成的共沸物及生成该共沸物的工艺。

简介：以2,2,6,6-四甲基-4-羟基哌啶、烯丙基氯和氢氧化钠为原料催化合成4-烯丙氧基-2,2,6,6-四甲基哌啶,分别研究了反应时间、原料配比、溶剂用量和催化剂用量等条件对合成4-烯丙氧基-2,2,6,6-四甲基哌啶反应的影响,确定的最佳操作条件为：反应温度为45～54℃,反应时间5h,反应物摩尔比为：n（烯丙基氯）∶n（2,2,6,6-四甲基-4-羟基哌啶）∶n（氢氧化钠）为0.45∶0.1∶0.4,溶剂用量为10g,催化剂的用量为0.2g（2,2,6,6-四甲基-4-羟基哌啶为0.1mol）,收率可达到95.43%以上,纯度为99.5%。

简介：β-sialon/alumina/silicamixturesweresinteredinflowingnitrogenat1500℃and1600℃respectively.ThesinteringpropertiesandmorphologyofsampleswereinvestigatedbySEM,EDSandXRD.Resultsshowthatsinteredpropertiesofthesamplesareinfluencedbysoakingtemperaturesandcompositions.Bulkdensitiesofsamplesareincreasedwiththeincreaseofthesoakingtemperature,whereastheapparentporositiesaredecreased.Masslossofthesinteredsamplesat1500℃islowerthanthatat1600℃,butallthemasslossremainsapproximatelyconstantwiththeincreaseofsialoncontent.Fromthepointofthermodynamicanalysis,ComplexchemicalreactionstakeplaceinsamplesduringsinteringprocessandthevolatileofSiO(g)isresponsibleforthemasslossofsamples.Comparedtocrosssectionmicrostructureofβ-sialon/Al2O3/SiO2mixturessinteredincokepowderbedconsistingofthedensecenterwithwell-developedcolumnofsialonphase,thetransitionalpartwithneedlelikegrainnitrogen-containingphaseandtheloosepartwithshortgranularAl2O3phase,thoseofmixturessinteredinflowingnitrogenisofwell-developedsialonindensecenterandslightlyloosepartwithsialondebris.

简介：MicrostructureandgrainboundarycharacterofhotpressedbinaryAl2O3(mullite,ZrO2)-SiCompositesandquaternaryAl2O3-mullite-ZrO2-SiCcompositewerestudiedbyelectronmicroscopyandmicroanalysis,ResultssuggestthatthereexistgrainboundarysolidsolutionsduetoelementaldiffusionnearSiCandmatrixoxidesgrainboundaries.

简介：Thedevelopmentofefficientbondingagentsisoneaspectoftheadvancementofrefractories.Basedonanewlydevelopedbindersystem,anewgenerationoftar-resinbondedmagnesiacarbonproductswithhighperformancehasbeendeveloped.Furthermore,thebindersystemcharacterizedbyhighcarbonyieldaftercarbonizationresultsinforminganextremelystrongcarbonbonding.Itcanimproverefractoriespropertiestogetnewproductwithmoreadvantagesthanoldrefractories:moreeconomic,lowercostandlowtoxicity.Tar-resinisnotonlyusedinshapedrefractories,butalsoinmorerefractoriestypes,suchasmonolithicrefractories.ImmersionexperimentsofMgO-Cmonolithicrefractoriessamplesinliquidsteelat1600℃havebeencarriedoutforsteelmakingindustry.TheseexperimentsshowedtheformationofadenseandcontinuousMgOrichlayer,ontheinterfacebetweenrefractoryandsteel,andthepossibleformationofinclusionsaslargeclustersprotrudingfromtherefractorysurface.Forthemechanicalproperties,thepowderwasheatedupto1400℃inairtoremovecarbon,andwassubsequentlyformedintobrickshape.StandardASTMwasusedtodeterminetheMOR,porosityanddensity.Itisfoundthatantioxidantmaterialsplayanimportantroleinimprovingthemechanicalproperties.

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简介：2016年6月28日，特种化学品制造商科莱恩宣布，在韩国最大的丙烷脱氢（PDH）工厂成功开车期间，其催化剂展现出了卓越的性能。

简介：南化集团研究院是国内最早研究开发和生产甲醇合成催化剂的单位之一。其产品经历了一个从联醇到单醇，从高压到低压的过程。该院的合成甲醇催化剂研究始于20世纪60年代，自60年代末成功研制出为我国独有的联醇工艺配套用的C207型联醇催化剂以来，以后又相继研制出了C301、NC501、NC501-1、C306、C307等型号的合成甲醇催化剂，广泛应用于国内高、中、低压系列合成甲醇装置。

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简介：MobarakehsteelCompanyproduces3milliontonsofsteelannuallywitheight180tonsEBTfurnaces.Differenttypesofmagnesia-carbonrefractorieshavebeenemployedatslaglineduringlast5years.InthepresentstudythewearandcorrosionofMgO-Crefractoriesofthesefurnaceshavebeenstudiedviapost-mortemanalysisofusedbricksandtheobservationofoperationaleffects.Laboratorycorrosiontestswerealsoarrangedtoinvestigatetheeffectofslagchemistryandthemechanismofchemicalcorrosion.Characterizationofdifferentmagnesia-carbonbricksclarifiedthatthecrystalsize,typeandchemistryofmagnesiaaswellasgraphitestructurehavethemaininfluenceoncorrosionresistance.TheCaO:SiO2ratioinslagalsoplaysavitalroleinthewearofslaglinerefractories.Theironoxidecontentofslagalsohasamajorroleingraphiteoxidation.Ofmetallurgicalparameters,theelectricpowerinputandthecontacttimehavegreatinfluenceonrefractorieslife.TheresultswillbediscussedwithemphasisonparticularoperationalfactorsinMobarakehsteelplant.

简介：LowcementAl2O3-SiO2castableswaspreparedusingsupergradebauxite(w(Al2O3)>85%)asaggregate,brownfusedcorundum,siliconcarbide,Secar71CAcement,α-Al2O3micropowderandmicrosilicaasfinepowders.TheinfluenceofSiC(0,5wt%,10wt%,and15wt%)onresistancetoPbO-richslagwasinvestigatedbystaticcrucibleslagtest(1300℃for5h,inair).TheslagcorrosionmechanismofthecastableswasanalyzedbymeansofSEM,EDSandXRD.TheresultsshowthattheresistanceofAl2O3-SiO2castablestoPbO-richslagisimprovedobviouslybytheadditionofSiC.ThecorrosionmechanismofthePbO-richslagcanbediscribedasthatPbOintheslagreactswithSiO2andCaOinAl2O3-SiO2castables,forminglow-meltingcompounds(suchasPbO·SiO2and2PbO·SiO2).

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简介：MgO-Al2O3-Cr2O3rammingmixesmadeofdifferentrawmaterialshavedifferentmineralstructureanddifferentphysicalpropertiesthoughwiththeidenticalparticlesizedistribution,thesameamountofbinderandchemicalcomposition.Theresidualcarboncontentofthefusedmagnesia-chromematerialmadeinreducingatmosphereisveryhigh,ifthismaterialsisusedintheMgO-Al2O3-Cr2O3rammingmix,itwouldcausespallingofthefurnaceliningduringdrying-out.

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简介：<正>一、市场行情简述本月行情:2月,纯MDI市场偏弱整理,节后市场窄幅震荡,贸易商跟随万华纷纷上调报价,下游开工恢复缓慢,处于休市状态,市场有价无市,并无听闻成交,临近中旬,元宵节后,下游大量需求的情况并未涌现,商谈气氛难有活跃,临近月末,下游库企高位,采购兴趣低迷,在最后一日,万华公布挂牌价格,上调500元/吨,挺市的心态明显,商谈的气氛有所回暖。上游原料:纯苯:2月纯苯市场在春节之后,受到节前调价影响,虽价格无基本变化,但下游及贸易商都对于后市并无看好,下游采购积极性偏低,相对于传统往年的节后市场,