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6 parameters of CO2 extraction of millet bran oil

Supercritical co2 extraction distillation of millet bran oil

Millet is a by-product of the processing of millet after being shelled into refined millet. It is rich in various nutrients. The gluten oil produced by it is a healthy oil.

The proportion of fatty acids contained is more consistent with the common cooking oil. Nutritional requirements, in addition to food, can also be widely used in medicine, health care products, cosmetics, and other industries.

Advantages of CO2 millet bran oil

The use of supercritical co2 fluid to extract millet bran oil from millet bran has many advantages, such as high solubility in extraction, faster mass transfer rate, better flow and balance, and good adjustability.

And easy to control, and maintain the biological activity of nutrients in gluten oil. And avoiding environmental pollution, the process is non-toxic and non-polluting and achieves clean production.

The millet bran oil extracted by supercritical extraction contains highly unsaturated fatty acids, especially containing up to 67.8% of linoleic acid.

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6 parameters of CO2 extraction of millet bran oil

The extraction conditions of gluten oil were used as indicators to study the process conditions of supercritical co2 extraction of gluten. The supercritical co2 fluid extraction-rectification study summarizes the effects of extraction pressure, extraction temperature, extraction time, and co2 flow rate on oil yield, rectification pressure, and rectification temperature on rectification.

The results showed that the optimum CO2 extraction conditions were:

  • Extraction pressure: 30 MPa;
  • Extraction temperature: 45°C;
  • Extraction time: 2h;
  • CO2 flow: 50kg/h;
  • Grain size: 40 mesh;
  • Moisture content: 7%.

The oil yield under this condition was 19.69%.

9 parameters of CO2 fractionation of millet bran oil

The most suitable conditions for supercritical co2 fractionation of gluten oil are:

  • Extraction pressure: 30 MPa;
  • Extraction temperature: 45 ° C;
  • Extraction time: 2 h;
  • CO2 flow: 50 kg / h;
  • Fractionation column pressure: 10 MPa;
  • Fractionation temperature rectification I: 40 ° C;
  • Fractionation temperature rectification II: 45 ° C;
  • Fractionation temperature rectification III: 50 ° C;
  • Fractionation temperature rectification IV: 55 ° C.

By measurement, the supercritical co2 extraction method extracts gluten oil containing high unsaturated fatty acids, especially containing up to 67.8% of linoleic acid. The physical and chemical indicators of extracting gluten oil by comparison to the supercritical CO2 extraction method are better than the commercially available gluten oil. Therefore, fluid extraction-rectification by supercritical co2 is a better method for extracting gluten.