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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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2. Liquefied gases as extraction solvents

The use of liquefied gases in a process that can be easily transposed to industrial scale involves a number of selection criteria linked to technical considerations. In particular, the following two thermodynamic criteria are essential for industrial use:

  • a boiling temperature at atmospheric pressure of between -30°C and ambient temperature (+20°C), to enable the gas to be condensed at temperatures reasonably achievable on an industrial scale;

  • a steam pressure of less than 10 bar at ambient temperature, to limit the investment cost of pressure equipment.

These criteria make it possible to select a limited number of solvents (table

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