Apparatus for continuous column distillation

Por laboratory and semi-technical operation the packed column is the type chiefly employed in special cases use is made of plate columns constructed of glass, which, owing to the resistance of the material, are abo suitable for the distillation of corrosive substances. 

Apparatus for continuous distillation with tubular heater (Burstin and Winkler) 

1 - Constant level vessel, 2 — Needle valve, 3 = Observation bulb, 4 = Vacuum connection, o = Condensers, 6 = Metal block, 7 = Thermometer wells, 8 = Insulated jacket, 9 = Dephlegmator, 10 — Receivers, 11 = Vacuum connections. 12 — Burners 

Further details of a Destinorm apparatus for continuous distillation at reduced pressures (Fig. 162) will be discussed in chap. 5.2.2.5. A continuous plate column is exemplified in Fig. 167 bj a Labodest apparatus which can operate from atmospheric pressure down to about 20torr. It is provided with vapour-coUision bubble-cap plates of glass (chap. 7.3.3) having an efficiency between 80 and 100%. Their inode of operation is identical with that of industrial plates so that the test results can be transferred directly. Besides, they are well suited to demonstrations since the gradual exchange process can be observed. This type of column is built with lengths between 600 and 1300 mm and column diameters between 30 and 120 mm and has between 5 and 28 plates depending on the distance between the plates (35 to 150 mm). 

A remarkable feature of the apparatus of Kg. 167 is the boiler with circiJatory heating (4) which imitates the industrial construction. The switch cupboard (20) contains all the meastuing and control devices. 

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