CN102041164B

CN102041164B - Ultrasonic-assisted tea oil extraction method using subcritical CO2

Info

Publication number: CN102041164B
Application number: CN 201110001100
Authority: CN
Inventors: 邓泽元; 章晋武; 李广焱; 李静
Original assignee: NANCHANG TONGXIN ZICHAO BIOENGINEERING CO Ltd; Nanchang University
Current assignee: NANCHANG TONGXIN ZICHAO BIOENGINEERING CO Ltd; Nanchang University
Priority date: 2011-01-05
Filing date: 2011-01-05
Publication date: 2013-01-23
Anticipated expiration: 2031-01-05
Also published as: CN102041164A

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 completely gasify 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 and improve 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

A kind of ultrasonic auxiliary subcritical CO 2The method of extraction tea oil

Technical field

The present invention relates to a kind of method that extracts tea oil, relate in particular to a kind of ultrasonic auxiliary subcritical CO ₂The method of extraction tea oil.

Background technology

Oil tea is the Theaceae Camellia Plants, with olive, oil palm, coconut and be called the world four large woody edible oil source seeds, its growth is away from the pollution of chemical fertilizer and agricultural chemicals etc., therefore the grease that extracts from its seed is the non-polluted edible vegetables oil, and tea oil obtains from the tea oil tree seed just, have another name called Camellia oil, tea-seed oil.Tea oil does not contain the strong carcinogen aflatoxin, and the harmful materials such as erucic acid and gossypol, and its lipid acid forms similar to the best Vegetable oil lipoprotein sweet oil of generally acknowledging in the world, therefore the good reputation of " east sweet oil " is arranged, unsaturated fatty acids is up to more than 90%, but also be rich in other several functions sexual elements, such as natural VE, tea-polyphenol, camellianin, squalene, numerous active ingredients such as plant sterol, for the function of keeping cardiovascular systems, reducing cholesterol, anti-oxidant and enhancing immunologic function, prevention and treatment hypertension have obvious effect.At present, the tea oil processing industry of China, mainly to produce thick oil as main, along with the further understanding to tea oil healthy nutritive value, economic worth, China's edible oil consumption is just transformed to health by practical, tea oil production and deep processing will have larger development, and tea oil will have wide market outlook.

At present, producing of China's tea oil is general with milling process and lixiviation process, then to coarse tea oil come unstuck, the operations such as depickling, deodorization, decolouring, promote the quality of tea oil.In view of high with the oil extraction by pressing residual oil content, and the tea oil that lixiviation process is produced lacks fragrant, and color is dark, and the volatile solvent lixiviate has certain hazardness.In recent years, supercritical extraction has obtained attention in some vegetable oil materials.Use supercritical CO among the patent publication No. CN101194713A ₂The tea oil purity of extraction is high, and has omitted some refining procedures of grease, but because overcritical must just can carrying out under the ultra-high voltage state, high pressure limitation the amplification of useful volume, to equipment require highly, cost is large, difficulty expands the scale of production.Therefore be necessary prior art is further improved.

Summary of the invention

The object of the present invention is to provide a kind of ultrasonic auxiliary subcritical CO ₂The method of extraction tea oil, the method extraction tea oil is simple and easy, efficient, less investment, cost are low, be fit to scale operation.

The present invention is achieved like this, and method steps is:

(1) dry tea seed goes tea shell, pulverizing, the extraction kettle of packing into;

(2) with subcritical CO ₂Inject extraction kettle and mix with the tea seed raw material, keep subcritical CO ₂With the volume ratio of raw material be 2:1～5:1, open simultaneously the ultrasonic generator auxiliary extraction;

(3) under the condition of 10～30 ℃ of extraction temperature, extracting pressure 3～7MPa, ultrasonic power 50～1000W, ultrasonic frequency 20～50KHz, raw material is extracted, extraction time is 0.5～5 hour;

(4) after extraction finishes, the subcritical CO of tea oil will be carried ₂Liquid is transported in the separating still, then carries out reduction vaporization, makes subcritical CO ₂Liquid fully gasifies, and the control temperature is 30 ℃～70 ℃ in the evaporative process, emits the tea oil that extracts from the separating still bottom at last.

Described ultrasonic generator comprises ultra-sonic generator and ultrasonic transducer, ultra-sonic generator is positioned at the outside of extraction kettle, ultrasonic transducer directly passes in the extraction kettle by its horn,amplitude transformer, the cavitation effect that utilizes ultrasonic wave when liquid medium is propagated, to produce, add mechanical wave effect and heat effect that ultrasonic wave produces, active substance more easily is extracted.

Technique effect of the present invention is: (1) takes full advantage of subcritical CO ₂The advantage of abstraction technique and ultrasound assisted extraction technique can shorten extraction time, improves percentage extraction; (2) operating pressure is low, and extraction temperature can not affect the natural radioactivity of heat-sensitive substance below 30 ℃, has improved nutritive value and the quality of tea oil; (3) equipment investment is low, and refining procedure is few, and the tea oil loss is few, and the processed oil yield is high; (4) without CO ₂Dissolvent residual is a kind of natural green food.

Embodiment

Embodiment 1:

Tea seed after 8Kg pulverized is packed in the extraction kettle, is that the amount of 2:1 passes into subcritical CO by the volume ratio of solvent and tea seed raw material ₂Extract, under the condition of 20 ℃ of extraction temperature, extracting pressure 5MPa, ultrasonic power 500W, ultrasonic frequency 20KHz, extract 2 hours, extract complete after, will carry the subcritical CO of tea oil ₂Liquid passes in the separating still, regulates pressure to 0.1MPa, and 40 ℃ of control temperature make subcritical CO ₂Liquid fully gasifies, the CO after the gasification ₂After condensation, flow to the solvent tank recycle and reuse, emit tea oil 3.25Kg from the separating still bottom at last, the tea oil percentage extraction reaches 40.6%.

Embodiment 2:

Tea seed after 8Kg pulverized is packed in the extraction kettle, is that the amount of 3:1 passes into subcritical CO by the volume ratio of solvent and tea seed raw material ₂Extract, under the condition of 30 ℃ of extraction temperature, extracting pressure 7MPa, ultrasonic power 700W, ultrasonic frequency 50KHz, extract 4 hours, extract complete after, will carry the subcritical CO of tea oil ₂Liquid passes in the separating still, regulates pressure to 0.2MPa, and the control temperature 50 C makes subcritical CO ₂Liquid fully gasifies, the CO after the gasification ₂After condensation, flow to the solvent tank recycle and reuse, emit tea oil 3.32Kg from the separating still bottom at last, the tea oil percentage extraction reaches 41.5%.

Claims

1. ultrasonic auxiliary subcritical CO ₂The method of extraction tea oil is characterized in that method steps is:

(4) after extraction finishes, the subcritical CO of tea oil will be carried ₂Liquid is transported in the separating still, then carries out reduction vaporization, makes subcritical CO ₂Liquid fully gasifies, and the control temperature is 30 ℃～70 ℃ in the evaporative process, emits the tea oil that extracts from the separating still bottom at last,

(5) described ultrasonic generator comprises ultra-sonic generator and ultrasonic transducer, ultra-sonic generator is positioned at the outside of extraction kettle, ultrasonic transducer directly passes in the extraction kettle by its horn,amplitude transformer, the cavitation effect that utilizes ultrasonic wave when liquid medium is propagated, to produce, add mechanical wave effect and heat effect that ultrasonic wave produces, active substance more easily is extracted.