简介:Thisarticlereferstotheresultsofsmall-scaleandcommercialtestsonhigh-temperaturecrackingofC4fractioninFCCunittoincreasethepropyleneyield.ThebenchtestsrevealedthattheconversionrateofC4fractionduringhigh-temperaturecrackingreached37.38%andpropyleneyieldwasequalto15.60%withtheconversionrateofC4olefinsequatingaround50%.Theresultsofcommercialapplicationshowedthatadoptionofthetechnologyforhigh-temperaturecrackingofC4fractioninFCCunithadledtoanincreaseofpropyleneyieldby2.16%withnoremarkablechangesintheyieldsandpropertiesofotherproducts.
简介:ThepolycrystallinephaseWO3/g-C3N4wassynthesizedunderstirringusingtungstenicacid(H2WO4)andgraphiticcarbonnitride(g-C3N4)asrawmaterials.ThecatalystwascharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersivespectroscopy(EDS),theFouriertransforminfraredspectroscopy(FT-IR),andtheBrunauer-Emmett-Telleranalysis(BET).ThepolycrystallinephaseWO3/g-C3N4wasdeterminedbyXRDtechnique.TheoxidativedesulfurizationprocesswasinvestigatedusingWO3/g-C3N4asthecatalyst,30%hydrogenperoxide(H202)astheoxidant,and1-butyl-3-methylimidazoliumtetrafluoroborate([bmim]BF4)ionicliquids(ILs)astheextractant.Theoperatingconditions,includingH2WO4amount,ILdose,H2O2volume,temperature,catalystdosage,andtypesofsulfurcompounds,weresystematicallyresearched.Thedesulfurizationratecouldreach98.46%forremovingdibenzothiophene(DBT)fromthemodeloilunderoptimalreactionconditions.Inaddition,thecatalyticactivitywasslightlydecreasedafterfiverecyclesofcatalysts.Thereactionkineticsanalysisshowsthattheoxidativedesulfurizationsystemwasinaccordwiththefirst-orderreactionkineticsequation.Themechanismofoxidativedesulfurizationwasproposed.
简介:顺丁橡胶:厂商动态:燕化:四条线正常负荷生产,由于本月仍有出口胶的生产任务,因而没有太大销售压力,于周末再度提价,但由于合同价未执行完,部分下游用户仍在按前边价格接货,因而出货速度较快,库存少之又少。高化;三线保持稳速生产,由于原料供应大多通过外购,而主供方上海金山已提高了丁二烯的售价,因而成交价格较为坚挺,销势尚可,库存保持在较低水平。齐鲁:由于4月份提高了计划产量,因而双线保持高负荷生产,日产量在125-140吨左右,虽然丁二烯生产商再次报高报价,但根据市场形势,本周公司暂无再度提价的意向,销势一般,库存略有上升。岳化:由于原料供应的充足,在本处于满负荷状态,而地域的可垄断性,使报价再度提升,销售尚可,产销达到了平衡。大庆;双线满负荷生产,虽然提高了报价,但相对于其它同业,价位依然偏低,几笔大的订单将库存转瞬间消化待尽,因而短期内不会有销售压力。锦州:生产已完全步入正常化,在销势不甚顺畅的同时,原料的主供方又将价格再次拉升,由于原料完全靠外购供应,利润空间愈来愈少,因而不得已提高报价,但成交量相当有限,由于产量较低,尚无库存。独山子:因原料供应受到限制,只能维持单线生产,由于销势趋缓,没有提高报价,库存不高,近期无调价意向。
简介:本周,余姚中国塑料城塑料原料市场出现剧烈震荡。周初,基本上是延接上周的迅猛涨势,把市场价格进一步推高,特别是ABS树脂等性塑料,市场气氛上升到近年来的最高峰。周二,市场上刮起一阵冷风,传出降价的消息,造成市场一阵恐慌,在个别小销售商中即出现在压价抛售现象。实际上这是空穴来风,因为由于前期的塑料原料价格上涨的速度太快,涨幅过大,作适当回调这在市场运营中是正常现象。而且目前市场基本面的形势仍然太好,尽管下游市场的支持力度相对较弱,但得到上游市场强有力的支撑,外盘坚挺,国际油价还在继续攀高,国内石化生产厂家并没有出台下调出厂价格的举措。因此,经过短暂的骚动后,下半周的市场已趋平稳。
简介:ThispaperreportstheinfluencesofheattransfersurfacepropertiesontheformationofCaSO4foulingdepositionduringflowboilingheattransfer.Thesurfacesofseveraltestheatershavebeentreatedbysurfacemodificationtechniques.suchasdynamicmixingionbeamimplantationanddynamicmixingmagnetronsputteringtoreducesurfaceenergy.Foulingrunswiththeseheaterswerecarriedoutatdifferentheatfluxes,flowvelocitiesandsaltconcentrations.TheresultsshowthatheattransfersurfaceswithlowsurfaceenergyexperiencedsignificantlyareducedformationofCaSO4deposit.