An advanced aqueous method of extracting rapeseed oil with high quality

摘要

Because of concern about environment, health, and cost, research into the production of rapeseed oil by aqueous extraction has been promoted. The advanced aqueous extraction method using a 1.5:10 water-to-rapeseed kernel slurry ratio without the addition of any chemical which was finally developed in this study recovered 94.73% rapeseed oil with high quality. Acid value and peroxide value of rape seed oil produced were quite low at 0.2 mg KOH/kg and5 mmol/kg, respectively, which were superior to that produced by solvent extraction and high temperature expressing and that required by the Chinese national standard for first class edible oils. Water content in the de-oiled rapeseed residue powder was quite low at about 25%, which can be easily dried. No wastewater was discharged during the extraction of oils. This breakthrough shows the great potential of using aqueous extraction of rapeseed oil instead of solvent extraction or high temperature pressing. These results should provide valuable guidance for the future development of production technology of rapeseed oil by aqueous extraction on an industrial scale.