Method for extracting soybean oil by twice vacuum flash treatment and enzymolysis

Abstract

The invention discloses a method for extracting soybean oil by twice vacuum flash treatment and enzymolysis. First vacuum flash treatment is carried out on a soybean material after course crushing; the purpose of bursting cell walls is achieved under transient vacuum action and through the aid of the flash steam pressure generated by water in soybean embryonic cells, and fat is accumulated on thesurface layer after the wall bursting treatment. The porosity of the surface layer cells is increased, the leaching rate of grease and protein is improved, and the drying effect is achieved. Then soybean protein and soybean oil are effectively obtained by separation after the enzymolysis treatment, and the protein utilization rate of oil crops is improved. Secondary vacuum flash treatment is carried out on the obtained soybean oil; aldehyde and ketone substances, and free fatty acid generating peculiar smell in the soybean oil are rapidly removed; and meanwhile, the residual water is removed instantaneously. The obtained soybean oil has excellent quality, the loss of natural nutrient components in the soybean is low, the nutritional value is high, and the color reversion does not occur easily.

Description

technical field [0001] The invention relates to the field of edible oil processing, in particular to a method for enzymatically extracting soybean oil by adopting two vacuum flashing treatments. Background technique [0002] Soybean oil and soybean protein are two important products in the soybean processing process. During the extraction of soybean oil and protein, the soybean cell wall hinders the extraction rate of oil and protein and reduces the extraction rate of oil and protein. At present, there are many methods for reducing the hindering effect of the cell wall. In the common leaching oil production process, the pretreatment adopts the mechanical method to prepare soybean embryos, which destroys the soybean cell structure to a certain extent, but the effect of this method on improving the oil extraction rate is not obvious; the high-temperature extrusion method is adopted. Under the dual action of thermal effect and mechanical force, the cell wall is destroyed, whic...

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Problems solved by technology

In the common leaching oil production process, the pretreatment adopts the mechanical method to prepare soybean embryos, which destroys the soybean cell structure to a certain extent, but the effect of this method on improving the oil extraction rate is not obvious; the high-temperature extrusion method is adopted. Under the dual action of thermal effect and mechanical force, the cell wall is destroyed, which is beneficial to the subsequent leaching and desolventization of wet meal, but this method is only suitable for the production of soybean meal for feed, and cannot be used for the production process of low denaturation soybean meal