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Supercritical CO2 extraction of linseed oil from flaxseed meal

Supercritical CO2 extraction of linseed oil from flaxseed meal

Chunjuan Teng, Chengye Zhu, Dawei Song, Liwen Zhang Guizhou Aerospace Wujiang Electro-mechanical Equipment Co., Ltd.Guizhou Provincial Key Laboratory of SFE Technology & Equipment; Zunyi 563003; China


Flaxseed has a high oil content, with an average of 30-50%. Although the traditional physical pressing method can squeeze most of the oil (about 33.0%), the linseed meal after pressing still contains a large amount of linseed oil, which requires further extraction. Supercritical CO2 extraction technology is a separation technology that has been developed in recent years and has advantages in the extraction of active ingredients of natural products. It is not only green and safe, without solvent residues, but also has a high extraction rate and can retain the properties of the product itself for a long time. This paper uses supercritical CO2 extraction technology to extract the linseed meal after physical pressing. Under the conditions of 30MPa and 50℃, the extraction rate can reach up to 14.8%. On the basis of physical pressing, the oil yield can increase by about 9%. , Make full use of linseed raw materials, which has great market development prospects.


Supercritical fluid extraction technology is an efficient separation technology developed in recent years. It is a new type of separation technology that uses fluid in a supercritical state as an extraction solvent to extract certain components from liquid or solid materials. Supercritical fluid refers to a fluid whose temperature and pressure are above its critical temperature and critical pressure. In this state, the fluid has the properties of both liquid and gas, and its density is 2 orders of magnitude higher than that of general gas, which is close to liquid; viscosity is lower than liquid, but diffusion rate is faster than liquid, so it has better fluidity and higher mass transfer rate. It's fast and is good for the separation process. At the same time, the supercritical CO2 extraction technology has the characteristics of green and high efficiency, no solvent residue, extraction at low temperature, and no damage to heat-sensitive substances, so it has received increasing attention.

Flaxseed is the seed of annual or perennial herbaceous plant. The oil content of the whole seed is 35%~48%. The appearance of linseed oil is yellow and transparent, and residents in Qinghai, Inner Mongolia, Gansu, Shanxi, Ningxia and Xinjiang have eating habits. The traditional processing method of linseed oil is the physical pressing method. Although the processing volume is large, the oil in the linseed cannot be completely squeezed out, resulting in great waste. Supercritical CO2 fluid is a weakly polar substance, which is highly soluble in oils in natural products, so it can be used for the further extraction of flax meal.

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