Crude rice bran oil is the oil extracted from the outer layer of rice grains. There are different methods to obtain crude rice bran oil, such as rice bran oil solvent extraction, physical pressing, subcritical liquefied dimethyl ether extraction, and supercritical CO2 extraction. Each method has its own advantages and disadvantages, such as oil yield, quality, cost, and environmental impact. Here are some brief descriptions of each method:
1. Solvent extraction: This is the most common and widely used method for extracting crude rice bran oil. It involves using a chemical solvent, usually hexane, to dissolve the oil from the rice bran. The solvent is then evaporated to obtain the crude oil. This method has a high oil yield and low cost, but it also has some drawbacks, such as the toxicity of hexane, the loss of some bioactive compounds, and the generation of solvent residues and waste.
2. Physical pressing: This is a mechanical method that uses a screw press or an expeller to squeeze the oil out of the rice bran. This method does not require any solvent or heat, and it preserves most of the bioactive compounds in the crude oil. However, this method has a low oil yield and high energy consumption, and it may cause some oxidation and degradation of the oil.
3. Subcritical liquefied dimethyl ether extraction: This is a green technology that uses dimethyl ether (DME) as a solvent to extract crude rice bran oil under subcritical conditions (low temperature and pressure). DME is a biodegradable, non-toxic, and renewable solvent that can be easily separated from the oil by simple depressurization. This method has a high oil yield and quality, and it retains most of the bioactive compounds in the crude oil. It also has low energy consumption and environmental impact.
4. Supercritical CO2 extraction: This is another green technology that uses carbon dioxide (CO2) as a solvent to extract crude rice bran oil under supercritical conditions (high temperature and pressure). CO2 is an inert, non-flammable, and recyclable solvent that can be easily separated from the oil by simple depressurization. This method has a moderate oil yield and quality, and it preserves some of the bioactive compounds in the crude oil. It also has low environmental impact, but it requires high capital investment and operating cost.
I hope this information helps you understand how to get crude rice bran oil. If you want to learn more about the nutraceutical composition and health benefits of rice bran oil, you can check out our website: https://ricebranoilpress.com/