Buchi Rotavapo R-100 Manual do Utilizador descarregar pdf (Página 34)

6|Operation BÜCHILabortechnikAG

34/60 OperationManualRotavapor®R100

6.2.2 Adjustingdistillationconditions

Toobtainoptimumdistillationconditions,theenergyabsorbedbythesolventfromthe

heatingbathmustberemovedagaininthecondenser.Toachievethat,thefollowing

settingsarerecommended:

Δ 20 °C

20 °C

40 °C

60 °C

Δ 20 °C

1 Coolanttemperature:20°C

2 Vaportemperature:40°C

3 Heatingbathtemperature:60°C

Thetemperaturedifferencebetweenheatingbathandevaporatingflaskandbetween

evaporatingflaskandcondensershouldbe20°Cineachcase.

Thepressureintheevaporatingflaskshouldbesetsothattheboilingpointofthesol

ventisaround40°C(seeChapter10.1"Solventtable",page47).

Theflowrateofthecoolantdependsonthetypeofcoolantusedandthecapacityof

thecoolerbutshouldbeatleast40–50L/h.

Thosesettingsofferthefollowingadvantages:

 Theevaporatingflaskcanbereplacedwithouttheriskofskinburns.

 Theevaporationrateofthewaterintheheatingbathislow.

 Theenergyoftheheatingbathisefficientlyutilized.

Toachieveoptimumdistillation,alldevicesinthesystemshouldbematchedtoone

another.Therefore,werecommendthattheRotavapor®R100isusedtogetherwith

theBUCHIVacuumPumpV100andtheBUCHIRecirculatingChillerF105(see

Chapter3.2.4"Typicalapplication",page14).Thatwillenableachievementofastable

vacuumandstablecooling,andthusamoreefficientdistillationprocess.

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Buchi Rotavapo R-100 Manual do Utilizador Página 34