Abstract: Elastic scraper for high-capacity continuous molecular evaporation and reactors with a wiped-off film, the scraper being in the form of a plurality of wiping segments mounted upon a wiping device having a plurality of circumferentially spaced parallel supporting rods which rotate with respect to the surface of the apparatus from which the film is to be wiped. The wiping segments are held from above by an elastic spring which connected them to their respective supporting rods. The supporting rods may be floatingly mounted, as by connecting segments which are mutually joined whereby to provide the supporting rods and the wiping segments supported thereby with limited concumferential movement with respect to the surface to be wiped.

Abstract: Heat and/or mass transmission between two or more phases is accomplished by a helical guide for both phases inside a column flowing either in counter-current or in co-current. The phase with a higher specific mass flows within the column along a continuous track formed by an outer helix; the phase with a lower specific mass flows along an internal helix within the column. These flows are brought about by suitable elements which are built-in in a cylindrical column.