Stills Hickman centrifugal molecular

Figure 13.30. Molecular distillation and related kinds of equipment, (a) Principle of the operation of the falling film still (Chemical Engineers Handbook, McGraw-Hill, New York, 1973). (b) Thin-layer evaporator with rigid wiper blades (Luwa Co., Switzerland), (c) The Liprotherm rotating thin film evaporator, for performance intermediate to those of film evaporators and molecular stills (Sibtec Co., Stockholm), (d) Centrifugal molecular still [Hickman, Ind. Eng. Chem. 39, 686 (1947)].

F mre 9.55 Schematic section, centrifugal molecular still of Hickman [19]. 

Short path and molecular distillation were developed in the 1930s and 1940s mainly in the UK and in the USA. Different types of apparatus were developed. A still with a disk, rotating at high speed, is named after Hickman, one of the pioneers [2]. In this machine the centrifugal force is used to distribute the feedstock as a thin film on a heated disk. Exposure time is less than a few seconds ... 

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See also in sourсe #XX -- [ ]

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