Subcritical continuous walnut oil extraction method and extraction tank group

Abstract

The invention relates to a subcritical continuous walnut oil extraction method and an extraction tank group. The method comprises the following steps: (1), preprocessing; (2) extraction; and (3) oil processing. According to the method and the extraction tank group, the characteristics and nutritional ingredients of oil of target products can be kept without loss; after the extraction, the residualoil of meal can be reduced to 1% and protein in the meal is not changed; in the extraction process, the recovered solvent can be recycled; and the extraction tank is capable of effectively solving the problems that the extraction rate is low, the extraction frequency is increased and the extraction time is long as all the materials are stacked in the extraction tank in traditional using. According to the method and the extraction tank group, the nutrient loss caused by complex process of crude oil refining and high temperature is avoided. The method and the extraction tank group are short inproduction period, low in cost, green and safe, mild in reaction, free of toxic and / or side effects and suitable for large-scale continuous production. According to the method and the extraction tankgroup, the oil and degreased meals extracted from walnut oilseed meals can be directly applied to the field of functional foods and cosmetics.

Description

technical field [0001] The invention relates to a method for extracting walnut oil, in particular to a subcritical method for continuously extracting walnut oil, and also relates to an extraction tank group used in the method, which belongs to the field of food processing. Background technique [0002] my country's walnut planting area and output rank first in the world, and Yunnan ranks first in the country. As of 2015, Yunnan Province has a walnut planting area of ​​42.3 million mu and an output of 850,000 tons, ranking first in the country in both output and area. With the expansion of walnut planting scale and output year by year, there are more and more domestic walnut oil manufacturers. In order to ensure the quality and nutritional content of oil products, oil companies mostly use low-temperature pressing to extract oil, and a large amount of pressed cakes are produced. . However, the most significant defect of the pressing method is that there is still a lot of resi...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: because walnut kernels have high oil content, it is difficult to directly prepare powders smaller than 2mm; the residual oil of the butane subcritical extraction method is very low (can be 6%), especially higher residual oil in cake cakes from low-temperature pressing

[0005] When using subcritical oil extraction in the prior art, the materials are generally wrapped in several filter bags and put into the extraction tank. Design modifications are necessary inside the tank

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