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: A liquid seal for a multistage molecular evaporator which is in the form of an elongated vessel having convex evaporating surfaces for carrying out a continuous redistillation. The evaporator includes at least two vacuum stages superposed one over the other in the vessel. The upper stage has two inwardly extending troughs one superposed over the other. An overflow tube extends from the upper trough into a collecting trough of the adjacent lower vacuum stage to form a first liquid seal. A collecting member in the upper stage extends into the lower trough of the upper stage to collect distillate therein and to form a second liquid seal therein. The upper and lower vacuum stages have evaporator bodies which are connected to each other by sealing means.

Abstract: A method for the continuous decomposition of stable carbon dispersions in waste engine oils, the decomposition being immediately followed by an oil re-refining step as, preferably, a short-path distillation. In accordance with the invention, waste oil is heated, under a pressure ranging from 1 to 100 Pa, in the form of a thin film (0.1 to 2 mm thickness) to a temperature of 200.degree.-300.degree. C., whereby liberated vapors together with entrained microdrops condense at a temperature of 20.degree.-100.degree. C. Thereupon the condensate is immediately subjected to a short-path distillation to be re-refined. The entire process is advantageously effected in a single apparatus.

Abstract: An arrangement for multistage vacuum and molecular distilling with a wiped off film using a single evaporator body common for different vacuum stages, with rotating vacuum seals between adjacent vacuum stages provided with a common drive.