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Article | REF: J2775 V1

Liquefied gases as alternative solvents for green extraction of natural products

Authors: Vincent RAPINEL, Natacha ROMBAUT, Njara RAKOTOMANOMANA, Alain VALLAGEAS, Farid CHEMAT

Publication date: August 10, 2018, Review date: March 10, 2021

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3. Industrial-scale implementation

The special properties of the liquefied gases used, and in particular their low boiling point, facilitate the solvent evaporation/condensation stages, prompting manufacturers to develop extraction units incorporating the solvent recycling circuit. In this way, extractions can be carried out in either batch or semi-continuous mode.

Two types of industrial extraction units using liquefied gases can be distinguished, depending on their thermodynamic operation: units operating according to a thermodynamic "heat pump" cycle, with a compression phase followed by an expansion phase, and units operating in isobaric mode (constant pressure).

3.1 Compressor systems

Compression/expansion" systems are those in which the solvent (liquefied gas)...

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