Method for producing low-temperature bean pulp with solvent extraction

Abstract

The invention relates to a method for producing low-temperature soybean meal by the leaching method, belonging to the food industry low-temperature soybean meal production field. The method takes a soybean slice as a raw material and uses pentane as leaching solvent to perform degreasing, and then wet meal is obtained; and the wet meal enters into a desolventizer-toaster for vacuum low-temperature exsolution, and then the low-temperature soybean meal is obtained. The leaching temperature is between 15 and 35 DEG C, the leaching time is between 20 and 35 minutes and the leaching frequency is 3; the residual oil rate of the soybean meal is reduced to below 1 percent; the vacuum degree of exsolution of the wet meal is between 73 and 86 kPa; the exsolution temperature is between 40 and 60 DEG C and the exsolution time is between 0.5 to 1 hour; the residual oil rate of the low-temperature soybean meal produced can reach blow 1 percent and residual solvent is below 200 milligrams per kilogram; and the NSI value of proteins of the soybean meal exceeds 80 percent. The low-temperature soybean meal produced by the method has high protein content, complete shape, white color and no foreign odor.

Description

technical field [0001] The invention discloses a method for producing low-temperature soybean meal by leaching, which belongs to the field of low-temperature soybean meal production in the food industry. Background technique [0002] In a vegetable oil factory, the soybean meal after degreasing by leaching is a wet meal containing about 40% to 50% solvent. Due to the high boiling point of the solvent used, high temperature treatment is generally used for the desolventization of leached wet meal, which causes most of the water-soluble protein in soybean meal to be denatured by heat, which reduces the application value. Therefore, the production of high-quality low-temperature soybean meal is an important guarantee to increase the use value of soybean meal and expand the scope of utilization. [0003] "Low-temperature precipitation" refers to the use of a short-term low-temperature precipitation process in the process of solvent removal from wet meal, and finally obtain soybe...

AI Technical Summary

Problems solved by technology

However, these three methods have disadvantages

The disadvantage of the flash desolventization process is that the residual solvent and moisture in the meal are relatively high; the disadvantage of the double-tube horizontal desolventization is that the wet meal stays in the two-stage desolventizer for a long time, the degree of denaturation of the water-soluble protein in the meal is high, and the protein yield is high. Relatively low; the disadvantage of No. 4 solvent leaching technology is high working pressure, large investment in equipment, and the solvent must be pretreated before leaching, otherwise the impurities in it will adversely affect the quality of protein in the meal

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