Short Path Distillation

Short path distillation or molecular distillation is a liquid-liquid separation process for high boiling, High viscosity, and heat sensitive, readily oxidisable materials.

In the process of short path distillation, molecules escape from warmer liquid on vessel surface towards a cooler surface inside a condenser. The escaped vapours condense and the hence even called molecular distillation.

short-dia2
Advantages Technical Add-ons (for best function)
Continuous distillation process for heat sensitive, fouling and viscous products. Advanced Automation with PLC/ SCADA (optional)
Low operating pressures and jacket design for efficient heating. Heating circulator/chillers can be included
Short residence Vacuum pump can be included
Higher heat transfer coefficients and high evaporation rates
Easy operation with low maintenance
Flexible design with low hold up and minimum losses

Working Principle:

Operational process involves thermal separation of mixture by formation of a thin film on the shell surface.

How ?

A rotating distribution plate with special designed wipers help in forming a film on shell for the feed from the feed vessel. The rotor is responsible for stabilising the liquid film on the heating surface. The thin film formed helps in efficient heat transfer for viscous heat sensitive fluids.

In the centre of the body is a closely positioned internal condenser, providing a short path for the vapours molecules traveling from heated surface to condenser surface. Lighter fractions or components with lower boiling point vaporise and move towards the condenser. They come in contact with the cooler surface and condense into liquid which flows downward and is collected in distillate receiving flask. The heavier component does not evaporate and flows down the body and gets collected in residue receiving flask.

Note: The rotors and wipers are specially designed for formation of a thin film.

Applications of Short Path Distillation:

  • For separation process in food and pharmaceutical industries
  • Molecular distillation of fatty acids, esters, etc
  • Concentration of biomaterial and essential oils
  • Solvent recovery and residue removal
  • Deodorisation, decolorisation and purification of materials of high value
Models for Short path Distillation
Model Inside
Diameter (mm)
Evaporation Area
(m2)
Condensation Area
(m2)
Processing Flow (kg/h) RPM / min Chiller Heating Circulator
JE-SPD2 50 0.05 0.1 0.1 to 2 UP TO 400 FL-800
(Power – 900 W)
UC-1820
(Power – 2 kW)
JE-SPD3 80 0.1 0.15 0.3 to 4 UP TO 400 FL-800
(Power – 900 W)
UC-1820
(Power – 2 kW)
JE-SPD4 100 0.15 0.2 0.5 to 5 UP TO 400 FL-800
(Power – 900 W)
UC-1820
(Power – 2 kW)
JE-SPD6 150 0.25 0.4 1 to 8 UP TO 400 FL-0250
(Power – 2.5 kW)
UC-3020
(Power- 3 kW)
JE-SPD8 200 0.35 0.5 1.5 to 10 UP TO 400 FL-0250
(Power – 2.5 kW)
UC-3020
(Power- 3 kW)
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