a rotary evaporator is described utilizing a magnetically driven fluorocarbon cylinder , operating within a solvent container , to create a thin solvent film for rapid evaporation without the usual requirement for rotating the entire solvent container assembly . infra - red heating is employed for efficient evaporation rates . solvent heating is controlled during evaporation by a single temperature probe , turning the infra - red heater on and off on demand of the probe . over heating of the product is prevented by maintaining a solvent residue at or near the conclusion of an evaporation .