By William Sabel
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Extra resources for Basic Techniques of Preparative Organic Chemistry
Simple stirrersj forms a very effectiveflexiblecoupling and will accommodate considerable misalignment between the motor and the stirrer shaft. To guard against the possibility of the stirrer shaft becoming detached from its coupling and dropping through the bottom of the flask or beaker, a thin tightly fitting retaining collar, cut from a piece of pressure tubing, is fitted over the shaft so that it just clears the top of the guide when assembled for normal use. If the mixture to be stirred is a thick, pasty slurry, a small stirrer simply cuts a hole in the centre, leaving the main part of the suspension undisturbed.
3(c)) can easily be fitted into a beaker, or wide-mouthed flask, but for a narrow-necked flask, a device with a flexible link must be used. An ordinary "hockey-stick" or similar stirrer fitted 54 BASIC TECHNIQUES OF PREPARATIVE ORGANIC CHEMISTRY with a length of stiff, plastic tubing which has been split longitudinally is a good improvization in some cases (Fig. 3(d)). II Motor shaft Rubber coupling ■ Protective collar Guide tube FIG. 4. Simple sealed stirrer assembly. Sealed stirrers are used when the escape of vapour or the ingress of air must be prevented.
When magnetic stirrers are not suitable, the simplest type of seal for a mechanically driven stirrer is achieved by making the guide long enough for its lower end to remain below the surface of the liquid in the flask, even in presence of the vortex produced by the rotation (Fig. 4). The main limitation of this type of seal is that it is only effective REACTION GENERAL PRINCIPLES shaft Oil reservoir P Rubber seal II Guide tube FIG. 5. Sealed stirrer assembly. when the pressure within theflaskdoes not differ from atmospheric by more than the head of liquid above the base of the stirrer guide.
Basic Techniques of Preparative Organic Chemistry by William Sabel