Discontinuous Rectification Model TH 120

* Discontinuous rectification

* Comparison of packed and sieve plate column

* Vacuum mode possible

* Plates in sieve plate column removable

Item Description

Distillation is used to separate liquid mixtures made up of individual liquids that are soluble in one another. Rectification refers to distillation in a counter-flow. Ethanol/water is recommended as the liquid mixture for the Sci-tech Discontinuous Rectification Model TH 120. The liquid mixture is added to the evaporator (bottom) tank. The mixed vapour produced moves upwards in the column. The mixed vapour contains a higher concentration of the component with the lower boiling point (ethanol). It leaves the top of the column and is condensed using a condenser and a phase separation tank. Part of the condensate is collected in a tank as product while the rest is fed back into the column. Here, on its way downwards, it undergoes further heating and material exchange with the rising mixed vapour. This exchange causes the vapour phase to become richer in ethanol and the liquid phase to become richer in water. The liquid phase moves to the bottom where it is collected.

Technical Specifications

[1] discontinuous rectification with packed and sieve plate column

[2] interchangeable columns

[3] sieve plate column with 8 plates

[4] packed column with Raschig rings

[5] vacuum mode possible with water jet pump

[6] electrically heated evaporator

[7] tank for top product

[8] condenser and phase separation tank for top product

[9] all tanks made of high quality glass and stainless steel

[10] adjustment of reflux ratio using valves

[11] 8 temperature measuring points per column


Columns: internal diameter: 50mm, height: 765mm

Water jet pump: final vacuum: approx. 200mbar


– top product: approx. 2000mL

– phase separation: approx. 500mL


– power output: 0…4kW

– tank: approx. 10L

Heat transfer surface

– top product condenser: approx. 0,04m²

Measuring ranges

– temperature: 13 x 0…150°C

– reflux ratio: 0…100%

– cooling water flow rate: 30…320L/h

– column differential pressure: 0…60mbar

– system pressure gauge: -1…0,6bar