Still Heads

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Head b24

still head

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Still Head b24 - all joints
Classic Design, integral tool in Chemical synthesis

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Still Head b24 - all joints
Classic Design, integral tool in Chemical synthesis

The still head is what makes a distillation work, it is the one piece of apparatus, responsible for diverting freshly boiled vapor down into the path of usually, an oncoming condenser.

 

At the top of the still head, is a jointed outlet, for the placing of a Thermometer Pocket, which is used to house a thermometer. As vapor is produced in the flask, it is best measured for its temperature, as it passes through the still head, and is then condensed down the line, by the condenser.

The joint sizes on this Still Head, are as standard as they come, B24 or 24/29 and compatible with 24/40. Being made of the latest Borosilicate 3.3, this vapour nanny’s (Bad choice of words?) can withstand serious temperatures, and most of all, contrasting temperatures.
By definition, these devices are usually placed in line, after the flask, so can get very hot. To complicate matters, they are often connected to a cooling tower of some sort (ie Condenser), making them a candidate for large differences in temperature. It is these characteristics, that make it prone to thermal cracking,. By paying careful attention to this difference in temperature, a chemist is able to ensure a long life for his still head.


As a general rule, borosilicate is best cooled and heated slowly, and care should be taken not to have the condensing temperature too cold, when it does not need to be.

It is a truly remarkable piece of equipment, opening the doors to many organic chemistry and science experiments. There is a plethora of knowledge that accompanies any distillation. I recommend reading Vogel’s 5th, on the theory of distillation, if you want to expand your understanding.

 

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Head b24

Head b24

Still Head b24 - all joints
Classic Design, integral tool in Chemical synthesis

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