Buchi Rotavapo R-100 Manual do Utilizador descarregar pdf (Página 11)

BÜCHILabortechnikAG Productdescription|3

OperationManualRotavapor®R100 11/60

3 Productdescription

3.1 Descriptionoffunction

TheRotavapor®R100isarotaryevaporatorwiththeaidofwhichsinglestagedistil

lationcanbecarriedoutquicklywithoutundulystressingtheproduct.Thebasisofthe

processistheevaporationandcondensingofsolventsusingarotatingevaporating

flaskundervacuum.Distillationundervacuumincreasescapacityandismoregentle

ontheproduct.

Theproductisheatedintheevaporatingflaskbytheheatingbath.Therotarydrive

unitevenlyrotatestheevaporatingflask.Thisconstantlymixestheproduct,thereby

increasingtheevaporationrate.Rotationalsopreventslocalizedoverheatingandde

layedevaporation.

Thevaporpassesfromtheevaporatingflaskthroughthevaporductintothecooling

section(condenser).There,thethermalenergyofthevaporistransferredtothe

coolantfluidsothatthevaporrecondenses.Theresultingsolventiscollectedinthe

receivingflaskandcanthenbereusedorproperlydisposedof.

Distillationundervacuum

Thedistillationcapacitydependsonthetemperatureoftheheatingbath,thepressure

intheevaporatingflask,thespeedofrotationandthesizeoftheevaporatingflask.

Lowerpressure,i.e.morevacuum,reducestheboilingpointofthesolventsothatit

requireslessheating.Thatmeansthatitcanbedistilledmoregentlyandatafaster

evaporationratethanprocessescarriedoutundernormalambientconditions.

Topreventundesirablesolventemissionanddelayedevaporation,thevacuumhasto

beadjustedtosuittheapplicationandkeptstable.Thiscanbeachievedbymeansof

avacuumpump(werecommendtheBUCHIVacuumPumpV100)controlledbya

vacuumregulator(werecommendtheBUCHIInterfaceI100).Wealsorecommend

thatthetemperaturedifferencebetweenthecoolantfluidandtheheatingbathis40°C

(seeChapter6.2.2"Adjustingdistillationconditions",page34).

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Buchi Rotavapo R-100 Manual do Utilizador Página 11