Method for extracting soybean grease from soybean emulsion

Abstract

The invention discloses a method for extracting soybean grease from a soybean emulsion, which comprises the following steps of (1) carrying out the demulsification preprocessing of the soybean emulsion by utilizing ultrasonic processing parameters, centrifuging and collecting the supernatant; (2) adding ethanol to the supernatant for demulsification processing, centrifuging and collecting the supernatant to obtain the soybean grease. The method for assisting ethanol demulsification by utilizing ultrasonic can demulsificate the emulsion formed in the extraction course of a soybean dehydratase method so as to obtain high-quality soybean grease. The method has the advantages of simple required equipment, safe operation, no solvent residual of soybean oil, high-quality and high-nutritive-value grease obtainment. The recovery rate after demulsification under the demulsification technological conditions can reach about 98 to 100% through verification and comparison tests.

Description

technical field [0001] The invention relates to a demulsification method in the extraction process of vegetable oils, in particular to a method for demulsification of emulsions formed in the process of extracting soybean oils by using an aqueous enzymatic method, and belongs to the field of extraction and processing of vegetable oils. Background technique [0002] The aqueous enzymatic method uses biological enzymes to hydrolyze soybean raw materials. The oil extraction conditions are mild, and the properties of the oil protein hardly change. Whether it is directly processed and utilized in the water phase or recovered and isolated protein for reuse, the effect is very ideal. However, the method of extracting vegetable oil with water as a solvent is applied to oil plants with low oil content such as soybeans, and the effect is poor, and the oil extraction rate is low. The protein contained in soybean is not only large in quantity, but also excellent in quality. It is a high-...

AI Technical Summary

Problems solved by technology

[0015] Due to the limitations of pretreatment technology, bio-enzyme technology and immature demulsification technology, no relevant papers have been published in China since 1994

In 2000, under the guidance of Professor He Guoqing of Zhejiang University, doctoral candidate Qian Junqing conducted a systematic study on the extraction of soybean oil with an aqueous enzyme organic solvent. Oil, enzymatic hydrolysis and then use petroleum ether to extract and separate oil, we can see that the process has not completely got rid of the traditional organic solvent chemical method, and the demulsification rate only reaches 84%, and it fundamentally solves the problem of water enzymatic extraction. The Difficulties of Soybean Oil

[0021] 1. Low oil recovery rate after demulsification

[0022] 2. Long demulsification time, not suitable for industrial production

[0023] 3. The cost of demulsification is high, which is not conducive to industrial application

[0024] 4. The demulsification process is complex

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