Method for extracting pecan oil by using supercritical carbon dioxide fluid

Abstract

The invention relates to a method for extracting pecan oil by using a supercritical carbon dioxide fluid, which comprises the following steps of: a, hulling pecans by using a huller, separating hulls from kernels, and selecting pecan kernels; b, putting the pecan kernels into a turbo crusher, and crushing the pecan kernels to the fineness of 18 to 25 meshes; c, putting the crushed pecan kernels into an extracting kettle, metering an extracting medium, namely carbon dioxide, through a flow meter, adding the extracting medium into the extracting kettle, controlling the supercritical extraction temperature to between 30 and 50 DEG C, controlling the supercritical extraction pressure to between 20 and 30 MPa, controlling the carbon dioxide flow to between 200 and 600 liters / hour, and controlling the extraction time to between 2 and 3 hours to prepare a mixture I of degreased pecan kernels, liquid carbon dioxide and the pecan oil; and d, adding the mixture I in the extracting kettle into an oil-liquid separator, controlling the separation pressure to between 5 and 12 MPa, controlling the separation temperature to be between 40 and 60 DEG C, and discharging the pecan oil from the bottom of the oil-liquid separator. The method for extracting the pecan oil by using the supercritical carbon dioxide fluid has the advantages that: the extracted pecan oil does not contain any organic solvent, and the bioactive ingredients of a product are better reserved.

Description

[0001] technical field [0002] The invention relates to a method for extracting hickory nut oil, in particular to a method for extracting hickory nut oil with a supercritical carbon dioxide fluid, belonging to the field of food processing. Background technique [0003] At present, the national demand for special oils with health benefits is increasing. In the "Outline of China's Food Structure Reform and Development Plan", hickory oil is listed as an edible oil that is vigorously promoted. Now the pressing method is generally used. Production process and organic solvent leaching production process, the crude oil produced by the pressing production process has more impurities, and needs to be treated by high temperature and chemical methods (such as alkali refining, water washing, dehydration, decolorization, etc.), the high temperature time is too long, the product formation method Sour oil is not conducive to human health; steam distillation of oil is easy to hydrolyze uns...

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Problems solved by technology

[0003] At present, the national demand for special oils with health benefits is increasing. In the "Outline of China's Food Structure Reform and Development Plan", hickory oil is listed as an edible oil that is vigorously promoted. Now the pressing method is generally used. Production process and organic solvent leaching production process, the crude oil produced by the pressing production process has more impurities, and needs to be treated by high temperature and chemical methods (such as alkali refining, water washing, dehydration, decolorization, etc.), the high temperature time is too long, the product formation method Sour oil is not conducive to human health; steam distillation of oil is easy to hydrolyze unsaturated fatty acids to form polymers, which can easily cause the loss and destruction of nutrients and beneficial substances such as vitamin E, carotene, phytosterols and trace elements in the oil, making protein Denaturation, the content of water-soluble protein decreases significantly, which reduces the nutritional value and functional properties of walnut oil itself; the crude oil produced by the organic solvent leaching production process has organic solvent residues, which is not good for human health

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