生物分离工程第二章过滤

1、滤饼滤饼传统的过滤cakeConventional filtrationfilterfilterfilterfiltratesolids recovery upon backflushFigure2.1 Schematic respresentation od s filter pressConceptual representation of plate and frame filterunderFlowsheet for continuous rotary vacuum filtrationwash spraysAir connectioncakeContinuos rotary filt

2、er WashwaterpumpWashFiltratepumpMoisturetrap30AiroutDryvacuumpumpBarometricsealVacuumreceiversFigure 2.2 Flowsheet for continuous rotary vacuum filtration18pH3.8pH2.8TheeffectonfiltratevolumeofpHpH值对过滤体积的影响00200400600612pH4.6pH4.2FiltrateVolume(cm)3Time(min)Time(min)181%filteraidinfeed2%3%5%00100400

3、600612FiltrateVolume(cm)3Theeffectonfiltratevolumeoffilteraid助滤剂对过滤体积的影响3、AdsorptiononFilterAids助滤剂上的吸附Table2.1.TypicalpropertiesofFilterAids1 1、Incompressible Cakes Incompressible Cakes 不可压缩滤饼不可压缩滤饼Valuesofsarehigh,weshouldconsiderpretreatingthefeedwithfilteraids.当s的数值很高时，须加入助滤剂对原液进行预处理。Slope=slogP

4、logFigCakeresistanceversuspressuredropDryWashImmersionKnifeCakeFeedRotaryvacuumfilter真空旋转过滤机pH5.0pH9.300.020.040.100.200.400.601.001.02.03.00.900.800.600.400.20WASH LIQUID / RETAINED LIQUID nRETAINED SOLUTES / ORIGINAL SOLUTES rEfficiencyofwashing洗涤效率D、EquipmentforConventionalFiltration传统的过滤设备人有了知识，就会具备各种分析能力，明辨是非的能力。所以我们要勤恳读书，广泛阅读，古人说“书中自有黄金屋。”通过阅读科技书籍，我们能丰富知识，培养逻辑思维能力；通过阅读文学作品，我们能提高文学鉴赏水