Ultrasonic-assisted tea oil extraction method using subcritical CO2

Abstract

The invention discloses an ultrasonic-assisted tea oil extraction method using subcritical CO2, comprising the steps as follows: (1) taking dry tea seed, hulling, crushing, and placing in an extraction kettle; (2) injecting the subcritical CO2 into the extraction kettle to mix with the tea seed; (3) extracting the raw material for 0.5-5 hours; (4) decompressing and evaporating so as to completelygasify the subcritical CO2 liquid, wherein the temperature in evaporation process is controlled at 30-70 DEG C, and finally discharging the extracted tea oil from the bottom of a separation kettle. The method has the advantages that (1), the advantages of the subcritical CO2 extraction technology and the ultrasonic extraction technology are sufficiently utilized to shorten the extraction time andimprove the extraction yield; (2), the work pressure is low, and the natural activity of heat-sensitive material cannot be influenced since the extraction temperature is less than 30 DEG C, and the nutritional value and quality of the tea oil are improved; (3), the device cost is low, the refining process is less, the tea oil loss is less and the product oil yield is high; (4) a natural green food is obtained since the CO2 solve is residue-free.

Description

technical field [0001] The invention relates to a method for extracting camellia oil, in particular to an ultrasonic-assisted subcritical CO 2 Method for extracting tea oil. Background technique [0002] Camellia oleifera is a plant of the genus Camellia in the family Theaceae. Together with olives, oil palms, and coconuts, it is known as the world's four major woody edible oil source tree species. Its growth is far away from the pollution of chemical fertilizers and pesticides, so the oil extracted from its seeds is green edible vegetable oil. Camellia oil is obtained from the seeds of Camellia oleifera, also known as camellia oil and tea seed oil. Camellia oil does not contain aflatoxin, a strong carcinogen, erucic acid and gossypol, which are harmful to the human body, and its fatty acid composition is similar to that of olive oil, the best vegetable oil recognized in the world, so it is known as "Oriental olive oil". Good reputation, unsaturated fatty acid is as high ...

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Problems solved by technology

Patent Publication No. CN101194713A using supercritical CO 2 The extracted camellia oil has high purity, and some refining processes of oil are omitted, but because supercritical can only be carried out under ultra-high pressure state, the extremely high pressure limits the enlargement of effective volume, high requirements for equipment, high cost, and expansion Production scale is difficult