- How does it work?
- What can it be used for?
- What can it not be used for?
- Related Facilities
- Further Information
|Key words||separation, extraction, solvent, solubility, selectivity, liquid-solid|
|Completed by||Wageningen UR - FBR|
How does it work?
|Primary objective||Removal of desired or undesired compounds from a raw material.|
|Working principle|| Compounds dissolve from a solid or liquid into a solvent. The technology is based on differences in solubility. Both compound and matrix can be the target fraction. During recycling of the solvent the compound is removed from the solvent by changing the process condition resulting in lower solubility.|
|Additional effects|| If the solvent is not gaseous at ambient conditions (e.g. water) the solid might need to be dried.
|Important process parameters||temperature, pressure|
|Important product parameters||solubility, viscosity, porosity, permeability|
What can it be used for?
|Products||(Unshaped) bulk products|
|Operations||Refining, decolourisation, deodorisation,|
|Solutions for short comings||Desire for pure flavours, colorants or other minor components of raw materials.|
What can it NOT be used for?
|Products|| Packaged products.|
Components that are not soluble in food approved solvents.
|Other limitations||Compounds with higher solubility are also extracted. They have to be removed afterwards.|
|Risks or hazards|| Risks:
|Maturity||Solvent extraction is available from lab to industrial scale. Liquid-solid extraction only batch wise. Liquid-liquid extraction also continuous.|
|Modularity /Implementation|| This technology requires a lot of space (especially the peripherals), therefore it is not easily inserted in an existing production line.
Application of a batch process into a continuous production line requires the (undesired) use of buffer tanks.
|Consumer aspects|| No information available.|
Use of solvents might be a point of concern.
|Legal aspects||For some solvents residue limits are defined.|
|Environmental aspects|| Some currently used solvents have a negative environmental impact.|
Energy use for CO2 recycling.
Facilities that might be interesting for you
|Institutes||Wageningen UR - FBR, VITO|
|Companies||DeSmet Ballestra, Feyecon, Nateco2, Natex, Separex|
|References|| 1. Council Directive 88/344/EEC of 13 June 1988 on the approximation of the laws of the Member States on extraction solvents used in the production of foodstuffs and food ingredients.
solubility, viscosity, porosity, permeability
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