A method for compound demulsification of soybean oil extracted by aqueous enzymatic method

Abstract

The invention provides a method for extracting soybean oil compound breakdown emulsion by virtue of an aqueous enzymatic method, and belongs to extracting and processing technologies of vegetable oil and fat. The method comprises the following steps: (1) crushing soybeans, then performing extrusion puffing to obtain a puffed material, mixing the puffed material with water to obtain a mixed solution, adding alkali protease into the mixed solution to perform enzymolysis, and then performing centrifugal separation to obtain free oil, emulsion, hydrolysate and residues; (2) mixing the emulsion with a AlCl3 solution at equal volumes, then adding a microbial surfactant, mixing uniformly, and then adjusting the pH value to be neutral; and (3) performing ultrasonic treatment on the treated emulsion, and then performing centrifugal separation to obtain soybean oil. By adopting the method, the inorganic salt AlCl3, the microbial surfactant and an ultrasonic technology are organically combined together to form an integral compound demulsification system which is low in cost and pollution-free, and is short in demulsification time and high in demulsification rate, and the obtained soybean oil is high in purity and good in quality and has a wide application prospect in processing of the vegetable oil and fat.

Description

technical field [0001] The invention belongs to the extraction and processing technology of vegetable oil, and mainly relates to a method for extracting soybean oil by aqueous enzymatic method and compounding demulsification. Background technique [0002] Demulsification is a very critical step in the method of aqueous enzymatic extraction of soybean oil. The more thorough the demulsification, the higher the recovery rate of oil. The quality of demulsification directly affects the economic value of the whole process. Demulsification methods are divided into chemical demulsification, physical demulsification and biological demulsification. The chemical demulsification method is to add a chemical demulsifier; centrifugation, changing the temperature, applying an electrostatic field, and using a coalescing agent are all physical methods; the biological demulsification method refers to the use of microbial cells themselves or metabolites of their metabolic processes to achieve ...

AI Technical Summary

Problems solved by technology

Although the viscosity and elasticity of the interfacial film suppress the oscillations, prevent the thinning and rupture of the interfacial film, and prevent the oil droplets from coalescing, the continuous increase in temperature and ultrasonic intensity will strengthen the Brownian motion, resulting in the rupture of the interfacial film, and finally the oil droplets coalesce into a large oil The beads float up to release the oil

[0006] In recent years, foreign scholars have mostly used organic solvents to directly extract the oil in the emulsion in order to investigate the effect of oil release from the oil plant cells after enzymatic hydrolysis, but no further research on technical breakthroughs has been reported, and the existing Demulsification technology has problems such as low demulsification rate and environmental pollution

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