How vacuum enables short path distillation

11-May-2021

Edwards are a world leader in the design, technology and manufacture of vacuum pumps for process applications in the chemical, speciality chemicals and pharmaceutical industries, tailoring solutions to our customers’ needs. Read the complete application note on how vacuum enables short path distillation below

Short path distillation (molecular distillation) is a thermal separation process for thermally sensitive products.

Its short residence time and low evaporation temperature will cause minimal thermal stress to the distilled product and consequently allow for a very gentle distillation.

By using vacuum in short path distillation, a substantial decrease of the boiling temperature is achieved by reducing the operating pressure.

As a result, it is a continuous separation process with very short residence time (tens of seconds) compared to hours on other conventional separation methods.

Vacuum is used to separate a liquid mixture via partial vaporisation of the components and the separate recovery of vapours and residues, where other distillation methods lead to breakdown of heat sensitive molecules.

Edwards’ application know-how, Chemical Process Industry (CPI) experience, most up-to-date process modelling techniques, and bespoke system design expertise can be used to optimise the pumping system configuration to maximise pumping performance in the most reliable, cost-effective and environmentally friendly way.

Using vacuum in short path distillation make for a gentle separation process that is widely applied on deodorisation, decolourisation, and purification of high value, heat sensitive substances, that can be easily oxidised.

Read the complete application note here to get a more detailed insight on this process and understand which vacuum pump types are most suitable to help drive it.

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