Reversed multiple leaching method for extracting rice bran crude oil

Abstract

The invention discloses a reversed multiple leaching method for extracting rice bran crude oil. The reversed multiple leaching method comprises the following process steps of (1) a pretreatment stage of the rice bran, comprising the steps of cleaning-pelletizing-drying; (2) a leaching stage comprising a leaching step; and (3) a separation stage of an oil phase and a solvent, comprising an evaporation step. The reversed multiple leaching method is characterized in that a broken rice separation step is arranged in the cleaning step of the pretreatment stage of the rice bran; a dust separation step is carried out on raw material grains after the drying step; and in the leaching stage, a reversed and continuous multiple leaching method is adopted. The reversed and continuous multiple leaching method lies in that a multi-shelf rice bran granular material frame is disposed in a leaching tank; and the rotation direction of the multi-shelf rice bran granular material frame is opposite to a solvent flow direction. In other words, the solvent firstly leaches the rice bran granular material in the last shelf, leaches the rice bran granular material in a plurality of shelves continuously in a reversed sequence and finally leaches the rice bran granular material in the first shelf. The method has the advantages of reducing solvent consumption rate, accelerating leaching speed, increasing oil yield and increasing the quality level of the rice bran crude oil.

Description

Technical field: [0001] The invention relates to an extraction process of rice bran oil, in particular to an extraction process of rice bran crude oil, in particular to a reverse multiple leaching method for extracting rice bran crude oil. Background technique: [0002] At present, the extraction methods of rice bran oil mainly include solvent leaching method, room temperature rapid equilibrium leaching method, supercritical CO 2 Extraction and enzymatic hydrolysis. Supercritical CO 2 The extraction method uses CO in a supercritical state 2 It not only has high permeability and low viscosity equivalent to gas, but also has density and excellent dissolving ability similar to liquid, and at the same time, there is no special property of solvent residue. By controlling the extraction pressure and temperature, the yield of rice bran oil can be improved. , This method has achieved gratifying results in research and development, but its energy consumption is high and equipment investme...

AI Technical Summary

Problems solved by technology

In addition, both the puffing extraction method and the granulation extraction method adopt a one-time extraction method. Due to the long extraction time, the solvent consumption is high, and the solvent content in the extracted mixed crude oil is high, which increases the difficulty and cost of subsequent solvent recovery.