Method for preparing rapeseed oil

Abstract

The invention discloses a method for preparing rapeseed oil. The method includes steps of (1), shelling rapeseed, removing impurities, compressing the rapeseed until fragmentary slices are obtained and then drying the fragmentary slices; (2), placing the rapeseed in ethyl alcohol-water mixed solvents with the ethyl alcohol content of 95-96% after the rapeseed is treated at the step (1), and extracting the rapeseed under the condition of the material-liquid ratio of 1:4-6; (3), centrifugally removing solid impurities from extract liquid obtained at the step (2) so as to obtain mixed oil; (4), storing the mixed oil under low-temperature conditions for a period of time, dividing the mixed oil into two types of liquid phase including solvent-rich phase and oil-rich phase, and centrifugally separating the solvent-rich phase and the oil-rich phase to obtain oil phase which is the rapeseed oil. The method for preparing the rapeseed oil has the advantages that the rapeseed oil can be extractedby the aid of ethyl alcohol under heating and pressurizing conditions, the mixed oil is cooled in low-temperature modes, the oil phase can be effectively separated from solvent phase, accordingly, the rapeseed oil is high in extraction rate, and the method includes simple processes and is convenient to operate; separated ethyl alcohol can continue to be used as extracting solution, and accordingly the utilization efficiency of solvents further can be improved.

Description

technical field [0001] The invention relates to the technical field of edible oil processing, in particular to a preparation method of rapeseed oil. Background technique [0002] Rapeseed oil, also known as rapeseed oil, coriander oil, and canola oil, is one of the main edible oils in my country. Rapeseed is one of the main oil crops in China. The annual output of rapeseed in the country exceeds 14 million tons. The absorption rate of seed oil can reach 99%. It has the effect of softening blood vessels and delaying aging. It contains phospholipids and low cholesterol, which can not only promote the development of blood vessels, nerves, and brain, but will not cause long-term consumption of cholesterol. [0003] At present, the traditional production methods of rapeseed oil include pressing and solvent extraction. The pressing method squeezes the rapeseed oil out of the rapeseed with the help of mechanical external force. Its advantages are simple process, less supporting equ...

AI Technical Summary

Problems solved by technology

The pressing method squeezes the rapeseed oil out of the rapeseed with the help of mechanical external force. Its advantages are simple process, less supporting equipment, good oil quality, light color and pure flavor; its disadvantage is the residual oil content of cake after pressing. High, low oil output efficiency, high power consumption

The leaching method applies the principle of liquid-liquid extraction, selects an organic solvent that can dissolve rapeseed oil, and sprays and soaks the oil to extract the oil. Its advantages are low residual oil in the meal and high oil extraction efficiency. The quality of meal is good, the labor productivity of leaching production is high, and it is easy to realize large-scale production and production automation; its disadvantage is that most of the solvents used in leaching production are flammable and explosive, have certain toxicity, and the production safety is poor, and the leaching of wool The oil contains more non-oil substances, darker in color and poor in quality