Starting up distillation apparatus

Arrangement of a distillation laboratory, starting up distillation apparatus... 

Chapter 9 — Arrangement of a Distillation Laboratory Starting Up Distillation Apparatus... 

The extent to which measuring and control devices are employed in batch and continuous distillation depends on the nature of the work and, to a considerable degree, on financial considerations [12]. In practice a distinction can be made between semi- (or partly) automatic and fuUy automatic apparatus. In the latter all operations except starting up are performed automatically in partly automatic apparatus only some of the functions are governed by regulating devices. 

Setting Up Place 10 mL of cyclohexane containing a nonvolatile dye in the round-bottom flask. Add a stirbar to the flask to ensure smooth boiling, and assemble the simple distillation apparatus shown in Figure 2.37a. Be sure to position the thermometer in the stillhead so the top of the mercury thermometer bulb is level with the bottom of the sidearm of the distillation head. Flave your instructor check your apparatus before you start heating the stillpot. 

This laboratory, which is intended for distillations involving more extensive chemical work, is equipped with two large central benches. Instead of the ventilated room, it only has two fume cupboards MA containing frames. One of these cupboards extends from the floor up to the ceiling (Fig. 408) the second starts from table level, but also contains stands for small apparatus. The air speed at the openings of the cupboards is maintained at 1 —2 ft/sec. 

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