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Products | Process Control and Process Engineering | Thermal Process Engineering | CE 620

CE 620

Liquid-Liquid Extraction

Technical Description

The CE 620 allows liquid mixtures to be separated using liquid-liquid extraction.
The liquid mixture to be separated is delivered from the feed tank into the bottom of the extraction column using a gear pump. There, it moves in countercurrent towards the solvent, which is delivered into the top of the packed column by a diaphragm pump. The mixture to be separated is made up of a transition component and carrier liquid. The carrier liquid and the solvent are insoluble in one another and therefore a phase boundary is established in the column. This can be adjusted using two regulating valves. The movement of the transition component from the carrier liquid into the solvent occurs inside the packed column. Two three-way valves can be used to operate the system as a closed or an open process.

To obtain the transition component and allow reuse of the solvent, the extract can be processed using a distillation unit. This consists of a round-bottomed flask with a packed column and a distillation bridge with Liebig condenser. A hemispherical heating mantle is used to heat the bottom product in the round-bottomed flask. The bottom temperature is measured by a sensor, displayed digitally and controlled using a PID controller. The temperature at the top of the distillation column is also measured. Distillation removes the solvent from the transition component which is collected at the bottom of the unit and can be drawn off as a product. The distilled solvent is collected in a tank and can be reused in the extraction process.

For a ternary material system, boiling petrol is recommended as the carrier liquid with benzoic acid as the transition component and distilled water as the solvent. A pH and conductivity meter is included to monitor the efficiency of the separating process.

Learning Objectives / Experiments

- Separation of a two-component liquid mixture by

extraction using a solvent
- Regeneration of the solvent by distillation
- Representation of the process in the Gibbs triangle
- Determination of theoretical number of stages
- Influence of feed and solvent flow rate on the

separating process

Features

* Separation of liquid mixture by liquid-liquid extraction

in countercurrent operation₁
* Regeneration of solvent using integrated distillation

system₁
* Operation in either open or closed process

mode is possible₁
* Design and materials allow investigation of different

ternary systems₁
* Adjustment and observation of phase boundary

possible

Alternative products

CE 630 -- Solid-Liquid Extraction

Specification

[1] Liquid-liquid extraction in countercurrent operation with regeneration of solvent
[2] Operation as closed or open process using

2 three-way valves
[3] Glass extraction column
[4] Distillation column and distillation bridge with Liebig condenser for solvent regeneration
[5] Electrical bottom heating via PID controller
[6] Water jet pump for reduction of evaporation temperature during regeneration
[7] Stainless steel tanks for feed, solvent, raffinate, extract and regenerated solvent
[8] Gear pump to deliver the feed
[9] Diaphragm metering pump for solvent
[10] 2 regulating valves for adjusting the phase boundary
[11] Both columns packed with Raschig rings

Technical Data

Columns:
- extraction: diameter: DN40, height: 1500mm
- distillation: diameter: 30mm, height: 450mm
Bottom heater power output: 945W
Tanks:
- feed and raffinate: approx. 30L each
- solvent and extract: approx. 15L each
- regenerated solvent: 15L
- distillation bottom tank: approx. 5L
Feed pump:
- max. flow rate: 1000ml/min
- max. head: 80m
Solvent pump:
- max. flow rate: 300ml/min
- max. head: 60m
Water jet pump: final vacuum: approx. 16mbar
Measuring ranges:
- distillation top temperature: 0...150°C
- distillation bottom temperature: 0...120°C
- feed flow rate: 100...850ml/min
- solvent flow rate: 40...360ml/min

Dimensions and Weight

l x w x h : 1350 x 700 x 2100 mm
Weight : approx. 200 kg

Connections

230V, 50Hz, 1 phase or 120V, 60Hz, 1 phase
Cooling water: 200...600L/h

Scope of Delivery

1 extraction system, complete
1 pH and conductivity meter
1 set of instructional material

Order Details

083.62000 CE 620 Liquid-Liquid Extraction