Patent ID: 6375893
Filing Date: 2002-04-23
Classification: B01D

Abstract:
Apparatus for evaporating given components from initial multiple-substance mixtures and multiple-substance systems at subatmospheric pressure comprising:a furnace body; a vacuum chamber; ring crucibles arranged at a plurality of levels; said ring crucibles are made of a material which acts as a susceptor towards alternating electromagnetic fields and each ring crucible has at least one vapor exhaust passage; a lowermost ring crucible being at the bottom of said ring crucibles; an uppermost ring crucible being at the top of said ring crucibles; with the uppermost ring crucible being closed except for at least one vapor exhaust passage; at least one heat body positioned under said lowermost ring crucible and above said uppermost ring crucible is made of a material which likewise acts as a susceptor towards alternating electromagnetic fields; at least one induction coil surrounds said furnace body, said ring crucibles and said heat bodies; and said lowermost ring crucible and said uppermost ring crucible are in thermal exchange with said heat bodies.