CAÑAMO

DIOXIDO DE CARBONO

SEMILLAS DE CAÑAMO

CANNABIS SATIVA L.

BIBLIOGRAFIA NACIONAL QUIMICA

2019

Hemp (Cannabis sativa L.) seeds are composed of a high oil content rich in polyunsaturated fatty acids and antioxidants such as tocopherols and carotenes, resulting in an interesting nutritional aspect. Oil from hemp seeds extracted using supercritical carbon dioxide (scCO2) as the solvent preserves the qualities described above. However, the high operating pressures and the low solubility of the oil in scCO2 significantly increase operating costs. Generally, the use of pressurized n-propane as a solvent for extraction of vegetable oils is an alternative to overcome these challenges without changing their nutritional qualities. The main objective of this work was to study the extraction of the oil from dehulled hemp seeds using scCO2, pressurized n-propane and organic solvents at atmosphere conditions, to compare some physicochemical properties of the extracts. The extraction conditions using scCO2 as the solvent were 40 and 60 °C and 30 and 40 MPa. These operating conditions of extraction are similar to those available in the literature. For pressurized n-propane used as a solvent, temperatures of 40, 50 and 60 °C and pressures of 6, 8 and 10 MPa were used. The values of the extraction pressures with n-propane were defined from the knowledge of the phase behavior measured for the system n-propane (1) / hemp seed oil (2). The values of the mass percentage yields were similar for both pressurized solvents. However, the solubility of the oil in n-propane was higher than in scCO2. The kinetics of the extractions were satisfactorily using the Sovová modeling.

The Journal of Supercritical Fluids v. 143, 2019. -- p. 268-274

Elsevier

2019

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DOI: 10.1016/j.supflu.2018.09.004

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