Chemical Engineering - Extraction

€ 845 excl. VAT
1 day

This course covers raffinate and extract layers, equilibrium extraction processes, flood rates and extraction columns.

Insight into and calculation of separation techniques

A solvent can be used to extract a component from a liquid mixture when the ternary phase diagram has a L-L-phase split. The spent solvent is often recovered (usually by distillation) and reused in the extraction process. Solvent selection is mainly based on selectivity and capacity.

The advantages of extraction are the possibility of low temperatures to protect unstable molecules. This makes the processes to be energy efficient and gives the opportunity to separate components with azeotropes or low relative volatilities. The weaknesses of extraction are that some equipment can be very complicated and/or expensive and the complexity of the mass-separating agent: recovery, recycle, storage. This makes it more difficult to model and scale-up than distillation.

Extraction usually involves the transfer of a desired product from one undesired mixture into another undesired mixture. This means that it requires downstream solvent and product recovery steps. The solvents may be flammable, toxic and expensive.

Get started with separation techniques


  • Explain principles of liquid-liquid extraction and its application
  • List some reasons to choose liquid–liquid extraction over other separation techniques like distillation
  • Distinguish between the raffinate and extract layers
  • Solve general transport equation and driving forces
  • Calculate the amounts and compositions in both phases of a single-stage equilibrium extraction process using the lever-arm rule
  • Choose equipment for liquid-liquid extraction
  • Calculate flooding velocities for packed towers
  • Explain mass transfer in mixers and columns
  • Determine the size of multicompartment extraction columns

During the course we will look at conceptual design of extractors involving the selection of solvent and calculating the number of theoretical stages by making use of different tools: McCabe-Thiele (graphical), Kremser (analytical), S-factor method (stage-by-stage), Hunter-Nash (graphical). Based on the result of this conceptual design the equipment is selected and the final design is performed.

After the course you are able to:

  • Make a design for an extraction process for temperature sensitive and reactive components, close boiling / melting points, removal of trace components (high cost of boiling), high boiling point products in water (phosphoric acid from water), azeotropes.
  • Make an ideal solvent selection with the next properties: high selectivity for the solute, high capacity to dissolver solute, minimum solubility in the carrier, different volatility than solute, stable, inert, low viscosity, non toxic / non flammable, available, moderate interfacial tension, large density difference with carrier, appropriate wetting properties.

Intended for

The course is meant for engineers, technologists, designers with a chemical, process, technological or mechanical background on bachelor or master level.

Within the program you can take six other courses. View them all on the page Chemical Engineering.

Course leader

drs. ir. Johan Krop

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Chemische Technologie - Extractie

Startdatum: 10 July 2024
Locatie: Delft
Prijs: € 845 excl. VAT

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