Process for preparing hazelnut oil

Abstract

The invention relates to a preparation method of hazelnut oil. Firstly, shelling hazelnut nutlets are cold-pressed by an oil press in low temperature to get pressed hazelnut oil and pressed cake. The pressed cake is then crushed to 40-60 meshes to get pressed cake powder. A method of carbon dioxide supercritical extraction is used to extract the pressed cake powder to get extracted hazelnut oil. The pressed cake powder is extracted under the pressure of 24-26MPa and the temperature of 50-60 DEG C in the carbon dioxide flow rate of 110-130 L / h for 2-3 hours. The pressed hazelnut oil and the extracted hazelnut oil are mixed together to get the hazelnut oil. During the preparation of the hazelnut oil, the invention firstly presses partial hazelnut oil in the hazelnut nutlets by using the low temperature cold-pressing method, then extracts the rest hazelnut oil in the pressed cake gained by pressing the hazelnut nutlets by using the carbon dioxide supercritical extraction method, has a high extraction rate, is easy to separate the oil and the cake, does not have solvent residue in the product, and is safe to be manufactured.

Description

technical field [0001] The invention relates to a method for preparing hazelnut oil, in particular to a carbon dioxide supercritical extraction step in the method for preparing hazelnut oil. Background technique [0002] Hazelnut is a kind of wild nut. The hazelnut kernel is fragrant and mellow, rich in oil (mostly oleic acid), protein, carbohydrates, vitamins, minerals, fiber, beta-gusterol and antioxidant carbolic acid and other special ingredients. A functional health food with high nutritional value. The hazelnut oil extracted from hazelnut kernels contains 71% to 91% oleic acid, 8% to 21% linoleic acid, and minerals such as vitamins A, B, E and calcium. Hazelnut oil can reduce the incidence of coronary heart disease, regulate blood pressure, lower cholesterol, reduce low-concentration lipoproteins, increase high-concentration lipoproteins, and reduce triacylglycerol in human blood; hazelnut oil is yellow amber and has a special aroma and taste Pleasant, is a high-grad...

AI Technical Summary

Problems solved by technology

The extraction rate of hazelnut oil produced by pressing method is low, and the oil content in the cake is relatively high; solvent leached hazelnut oil and residues of hazelnut oil produced by solvent method have solvent residues. As food and skin care cosmetics, solvent leached hazelnut oil residues are harmful to human body Healthy, a large amount of flammable and explosive organic solvents are used in solvent leaching production, and there are serious hidden dangers in production safety