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Fascinating Silicone™ Chemistry Corner – Chlorosilane Distillation

How chlorosilanes are distilled

Distillation is not a reaction. It is a liquid → gas → liquid phase change.

Each of the chlorosilanes produced during the synthesis stage has a unique boiling point. These boiling points are used to distill the chlorosilanes from one another based on the number of chlorine atoms attached to the molecule.

Because the boiling points of the various chlorosilanes are so close together, very tall distillation columns are required to separate them.

Once separated, the chlorosilanes are ready to be turned into useful siloxanes through the process of hydrolysis and condensation.



Did you know ... Outside of the petroleum industry, Dow Corning Corporation maintains the largest distillation operation
in the world!



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