简介:含氧煤层气易燃易爆,对其直接深冷精馏分离时,精馏塔内气相组分必定进入爆炸范围内,存在爆炸危险。利用N2可降低精馏塔内O2浓度确保精馏过程安全。通过对三种N2进入精馏塔的方式进行比较,得到结论从精馏塔底部通入N2能使整个精馏塔安全。
简介:蒸馏分离-苯芴酮比色法测定煤中锗的含量,对测量过程中的影响因素进行分析。
简介:1.NewenergyvehicleprovidesgoodopportunitiesforthedevelopmentofNiMHpowerbatteryUnderthebackgroundofdevelopinglowcarboneconomyglobally,allcountrieshighlightthedevelopmentofnewenergyandenergy-savingautosindustry.Keyautoproducingcountrieshaveformulatedseriesofpoliciestoencouragethedevelopmentoftheindustry.Productioncapacityofnewenergyandenergy-savingvehicleswillachievethescaleof1,000,000perannumby2015,accordingtoAmerican
简介:d.Rareearthexport1).REexportvolume.Exportvolumeofrareearthsincreasedyear-on-yearfrom1986to2005inChina.But,tostabilizerareearthmarketandfacilitatetheoptimizationofrareearthindustrystructure,Chinesegovernmenthadtakenseriespoliciessince2006,includingreducingexportquota,cancelingexporttariffrebate,adjustingtariffpolicies,increasingexporttax