Temp and Purity Vs Number of Plates if Column Stills

This is where the various designs that have cooling tubes running through their columns at all different heights (eg Labmaster) come adrift — they don't allow the required sequence of temperatures to develop fully, and thus won't work at their full potential. They also don't allow all the refluxed liquid to do its job over the packing — the less liquid/vapour contact the poorer the "polishing" of the vapour will be.

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