A method for improving the yield of peanut oil prepared by hydraulic pressure

Abstract

The invention discloses a method for increasing the yield of hydraulically produced peanut oil and belongs to the technical field of food processing. The problem of higher residual oil rate during hydraulic production of peanut oil at present is effectively solved with a hydraulic pressing method adopting gradient pressure increase. Meanwhile, with the adoption of the gradient pressure increase manner, long-term high-pressure hydraulic pressing is prevented, the service life of equipment is effectively prolonged, and the production cost is reduced. Compared with a constant-pressure pressing method, the method has the advantages that the oil yield is increased by about 13%, the oil yield through hydraulic pressing is increased effectively, and application of hydraulic pressing in the industry is facilitated. Besides, soft, elegant and aromatic peanut oil produced with the method has the aroma and taste inherent peanut oil, has no odors, has light color, is clear and transparent, is low in acid value and high in VE content, has stable oxidation stability and contains rich unsaturated fatty acid, sterol, wheat germ phenol, phospholipid, choline and the like.

Description

technical field [0001] The invention relates to a method for improving the yield of peanut oil prepared by hydraulic pressure, and belongs to the technical field of food processing. Background technique [0002] Peanut is the fourth vegetable oil in the world, accounting for about 14% of the world's annual oil production. The oil content in peanuts is as high as 44%-58%, most of which are unsaturated fatty acids, especially the essential linoleic acid content is very rich. The content of protein in peanut is 24%-34%, the digestibility reaches 90%, contains 8 kinds of amino acids necessary for human body, is the third plant protein source in the world, and can supply about 11% of the world's demand. Therefore, peanut is a good source of protein supply, and extracting high-quality oil from peanut is one of the requirements for the development of oil industry. [0003] The traditional peanut oil extraction process mainly refers to two kinds of pressing method and leaching met...

AI Technical Summary

Problems solved by technology

[0008] (3) Excessively high temperature destroys some special flavor substances, resulting in a burnt smell;

[0009] (4) The temperature is too high, which makes the peanut meal seriously denatured and difficult to reuse;

[0010] (5) Roasting seeds at high temperature consumes a lot of energy;

[0011] (6) The process is complicated and the cost is high

[0012] (7) The direct contact between the screw of the oil press and the material generates a lot of heat (usually the temperature exceeds 100°C), which makes the protein powder produced have poor color and poor nutrition, and is only sold as feed.

[0014] (1) There is no fragrance of peanut oil, which reduces people's acceptance;

[0015] (2) The temperature in the process is low, and the shelf life of peanut protein powder is short;

[0016] (3) The yield of peanut oil is low, the cost is high, the market price is high, and the popularity rate is declining

However, the main defect of hydraulic oil extraction in peanut oil production is that the residual oil is high, usually reaching more than 20%, which restricts its industrial application

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