简介:摘要:造纸工业排放的黑液含有大量木质素,约占废液总量的1~2%,在自然条件下难以降解,若黑液直接排放将造成严重的环境污染,因此,利用造纸黑液制备木质素磺酸钠得到了广泛的关注和研究。目前,造纸黑液制备木质素磺酸钠通常采用酸析法制得木质素再加入亚硫酸钠、甲醛转化成改性木质素磺酸钠,制备过程复杂,亚硫酸钠用量大,生产废液中硫酸钠、水不溶物含量也较高,使得废液量大,生产成本无法得到有效控制。因此本文旨在提供一种从造纸黑液硫化处理改性木质素磺酸钠的方法,通过制备方法的改进制得性能优异的改性木质素磺酸钠,减少了废液中硫酸钠、水不溶物的含量,降低了生产成本。
简介:Dampingahybridsteppingmotorwithestimatedpositionandvelocity,Gridcurrentregulationofathree-phasevoltagesourceinverterwithanLCLinputfilter,TorsionalinteractionstudiesonpowersystemcompensatedbySSSCandfixedcapacitor,Amultivariablenewcontrolsolutionforincreasedlonglinesvoltagerestorationstabilityduringblackstartup,
简介:[篇名]Magneto-OpticalStudiesoftheCriticalStatesinc-axisOrientedMgB{sub}2ThinFilmandBulkMgB{sub}2/MgNano-Composites,[篇名]TheSoreteffectonconvectioninahorizontalporousdomainundercrosstemperatureandconcentrationgradients,[篇名]Improvingtheanti-seizureabilityofSiCsealinwaterwithRIEtexturing,[篇名]Coppernanoparticleswithinamorphousandcrystallinedielectricmatrices,[篇名]In-linelaserDopplervelocimeterusingfibre-opticBragggratinginterferometricfilters,[篇名]PreparationofaUV-attenuatingagentusingamechanochemicalreaction,[篇名]DesignofanAdaptiveObserverforSensorlessVectorControlofInductionMachinesunderRegeneratingConditions,[篇名]ConflictovernaturalresourcesamongpastoralistsinnorthernKenya:alookatrecentinitiativesinconflictresolution,[篇名]Releasingnitrogenfromammoniatedligninbywhiterotfunguscometabolizesenvironmentalpollutants,[篇名]Onanalogyanddissimilarityofdependenceofstabilityonseveralparametersinflowsimulations,[篇名]Ontheexponentialstabilityofaclassofnonlinearsystemsincludingdelayedperturbations,[篇名]6-indiameterInPsinglecrystalsgrownbythehot-wall,[篇名]Swing-upControlofaTranslationalInvertedPendulumHavingRestrictedTravel,[篇名]RobustPIDRate-BasedControlforPropagationDelayVariation,[篇名]Apracticalapproachforthedesignofmultivariablecontrolsystems,[篇名]Fibersensordetectslithium。