What is 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.
The best process for supercritical 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, co2 flow rate on oil yield, rectification pressure, and rectification temperature on rectification.
The results showed that the optimum extraction conditions were extraction pressure 30 MPa, extraction temperature 45°C, extraction time 2h, co2 flow 50kg/h, grain size 40 mesh, and moisture content 7%. The oil yield under this condition was 19.69%.
CO2 rectification process
The most suitable conditions for supercritical co2 rectification of gluten oil are extraction pressure 30 MPa, extraction temperature 45 ° C, extraction time 2 h, co2 flow 50 kg / h, rectification column pressure 10 MPa, rectification temperature rectification I: 40 ° C, fine Distillation II: 45 ° C, rectification III: 50 ° C, rectification IV: 55 ° C.
By measurement, the supercritical 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.
Advantages of CO2 extracted 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 the 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 high unsaturated fatty acids, especially containing up to 67.8% of linoleic acid.