vacuum distillation

noun Chemistry.
a process of distillation employing a vacuum that by lowering the pressure on a liquid allows volatilization at a lower temperature than normal.

Origin:
1895–1900

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World English Dictionary
vacuum distillation
 
n
distillation in which the liquid distilled is enclosed at a low pressure in order to reduce its boiling point

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
One of them is vacuum distillation, which dewaters the oil.
The facility also includes a vacuum distillation system for on-site recycling of petroleum-based parts washer solvents.
Re-refining distillation bottoms means the heavy fraction produced by vacuum distillation of filtered and dehydrated used oil.
The underflow is routed to a vacuum distillation column.
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