CN1332008C - Process for extracting tangerine essential oil - Google Patents

Abstract

The invention discloses a process for extracting citrus peel essential oil, which comprises the following steps in turn: 1) selecting fresh citrus fruit peels, and removing the white peel layer when the inner layer of the peel is thicker than 0.5 mm; 2) removing the peel of the above peel Or squeeze the pericarp after removing the white skin layer, and spray high-pressure water while squeezing; a mixture composed of oil-water mixture and fruit particles can be obtained; 3) separate the above mixture, remove fruit particles, and obtain oil-water mixture; 4) Separating the above-mentioned oil-water mixture, removing water to obtain oil; 5) performing a dewaxing step on the above-mentioned oil. The citrus peel essential oil extraction process of the present invention has simple process and low cost, can be applied to both thick-skinned and thin-skinned citrus, and can produce high-quality essential oil.

Description

A kind of extraction process of citrus peel essential oil

technical field

The invention relates to a process for extracting citrus peel essential oil.

Background technique

Citrus peels mainly include tangerine, tangerine, orange, lemon, grapefruit, lime and other fruit peels, all of which contain high-grade spice essential oils. The natural ingredients in this essential oil include dozens to hundreds of terpenes, aldehydes, ketones, alcohols, esters, acids, etc. Essential oils are widely used: can be used in cool drinks, candy, biscuits, snacks, ice cream, as well as cologne, toothpaste essence and household cleaners in the daily chemical industry; citrus essential oils are also cleaning agents for printed circuit boards or other high-quality anhydrous Raw materials for cleaning agents. Different citrus types have different chemical components in their essential oils. According to the types of citrus, citrus essential oils include lemon oil, sweet orange oil, tangerine oil and so on. According to the extraction method, the one obtained by distillation is called "hot oil", and the one obtained by pressing is called "cold oil". The usual methods for extracting essential oils from citrus peels include pressing and steam distillation. Citrus essential oil is a fruit essential oil containing a large amount of monoterpenoids. Due to the high temperature of steam distillation, it is easy to produce polymerization deterioration and reduce the quality of essential oil. Therefore, steam distillation is less used. A large amount of industrial production often adopts the pressing and grinding method at room temperature, that is, at room temperature, the citrus fruit peel is ground or the peel oil is pressed, but these methods are suitable for thick-skinned citrus such as oranges and lemons, not for thin-skinned citrus. Tangerine. For example, the extraction method described in the FMC process and the Brown process, its main principle is to rub the peel of the citrus fruit before squeezing the juice, and rinse it with water; Break and spray water at the same time, so it is only suitable for oranges, not for oranges with wide peels; in addition, it can only be used for oranges in the form of complete fruits, not for oranges after peeling. In China, most of the citrus is peeled and canned, and the citrus peel is only an accessory product; how to make full use of these citrus peels and maximize their use value is a problem worthy of our exploration.

Contents of the invention

Aiming at the deficiencies in the prior art, the invention provides a citrus peel essential oil extraction process with simple process, low cost, applicable to both thick-skinned and thin-skinned citrus, and capable of producing high-quality essential oil.

The present invention is to achieve above object, is to realize by such technical scheme: provide a kind of extraction process of citrus peel essential oil, comprise the following steps successively:

1), select the fresh pericarp of citrus fruit, remove the white cortex layer that the thickness of pericarp inner layer is greater than 0.5mm;

2), squeeze the above-mentioned pericarp after removing the white skin layer, and spray high-pressure water while squeezing; a mixture composed of oil-water mixture and fruit particles can be obtained;

3) Using a centrifuge to separate the above mixture, remove the fruit particles, and obtain the oil-water mixture; the separation factor is 560-580;

4) Separating the above oil-water mixture with a disc centrifuge to remove water to obtain oil; the separation factor is 9000-11000;

5), above-mentioned oil is carried out dewaxing step.

The present invention also provides another extraction process of citrus peel essential oil under the same inventive concept, comprising the following steps in turn:

1), select the fresh pericarp of citrus fruit, the white cortex of described pericarp inner layer is less than or equal to 0.5mm;

2) Squeeze the above-mentioned pericarp, and spray high-pressure water while squeezing; a mixture composed of oil-water mixture and fruit particles can be obtained;

3) Using a centrifuge to separate the above mixture, remove the fruit particles, and obtain the oil-water mixture; the separation factor is 560-580;

4) Separating the above oil-water mixture with a disc centrifuge to remove water to obtain oil; the separation factor is 9000-11000;

5), above-mentioned oil is carried out dewaxing step.

As an improvement of the citrus peel essential oil extraction process of the present invention: step 2) use a three-stick sugarcane press to press.

As a further improvement of the citrus peel essential oil extraction process of the present invention: the disc centrifuge is a special tangerine oil separator.

As a further improvement of the citrus peel essential oil extraction process of the present invention: citrus fruits are citrus, tangerine, orange, pomelo, lemon, high orange or miscellaneous citrus fruits.

The citrus peel essential oil extraction process of the present invention has the advantages of simple process, convenient operation and low production cost; the prepared essential oil product is pure, and the natural fragrance is less damaged. Compared with the existing pressing method, the citrus peel essential oil extraction process of the present invention can directly extract the essential oil from the citrus peel at one time, and does not need to perform lime hardening treatment on the peel in advance; Production Process. Compared with the distillation method, no heating is required, and the aroma is significantly improved. Compared with FMC and Brown process, it can be applied to both thick-skinned and thin-skinned citrus. The citrus peel essential oil extraction process of the invention is very suitable for China's national conditions, and can maximize the use value of citrus peel as a by-product of canned citrus.

Detailed ways

Embodiment 1, a kind of extraction process of orange peel essential oil is characterized in that the method is:

1) Select fresh peels of citrus fruits, such as oranges, grapefruits, lemons, high oranges or other miscellaneous citrus fruits; when the thickness of the inner white layer of the peel is ≤0.5mm, it indicates that the peel is thin Type citrus fruits, such as tangerines and tangerines, can be used directly; when the thickness of the white skin layer of the inner layer of the peel is >0.5mm, it indicates that this is a thick-skinned citrus fruit, such as oranges, grapefruits, lemons, and high oranges. Citrus or other miscellaneous citrus, you can use a peeler to separate the peel into a white layer and a yellow layer, remove the white layer, and use the yellow layer. Because if the white cortex is too thick, it will absorb the pressed oil during the following pressing, thereby reducing the yield of the final essential oil.

2), the pericarp of the above-mentioned thin-skinned citrus fruit or the yellow skin layer of the thick-skinned citrus fruit is squeezed using a three-stick sugarcane press currently used in the sugar industry. Adjust the distance between the three pressing rollers of this press to the minimum distance, crush the oil cells in the citrus peel as much as possible, so that the peel oil can be released from the oil cells; spray high-pressure water while pressing; the outlet of the press A mixture composed of oil-water mixture and fruit particles can be obtained;

3), the above-mentioned mixture is separated, and purpose is in order to remove fruit particle, obtains oil-water mixture. The following two methods can be used for separation. 1. First use a vibrating screen with a sieve diameter of 1mm, and then use a flat sieve with a sieve diameter of 0.2mm to remove fruit particles in turn to obtain an oil-water mixture; 2. Directly use a centrifugal separator with a separation factor of 560-580 , such as a pulp and residue separator, to separate and remove fruit particles with a diameter of more than 0.02mm to obtain an oil-water mixture.

4) Put the above-mentioned oil-water mixture into a disc centrifuge with a separation factor of 9000-11000, such as a special orange oil separator, to separate, remove water, and obtain oil;

5), the above-mentioned oil is put into-18 ℃ cold storage to preserve, removes the wax of peel oil simultaneously, can obtain pure citrus peel oil.

Finally, it should also be noted that what is listed above is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (6)

1, a kind of extracting process of citrus peel essential oil is characterized in that comprising the following steps successively: 1), select the fresh pericarp of citrus fruit, remove the white cortex layer that the thickness of pericarp inner layer is greater than 0.5mm; 2), squeeze the above-mentioned pericarp after removing the white skin layer, and spray high-pressure water while squeezing; a mixture composed of oil-water mixture and fruit particles can be obtained; 3) Using a centrifuge to separate the above mixture, remove the fruit particles, and obtain the oil-water mixture; the separation factor is 560-580; 4), the above-mentioned oil-water mixture is separated using a special orange oil separator, and water is removed to obtain oil; the separation factor is 9000-11000; 5), above-mentioned oil is carried out dewaxing step. 2. The extraction process of citrus peel essential oil according to claim 1, characterized in that: said step 2) uses a three-roll sugarcane press to press. 3. The extraction process of citrus peel essential oil according to claim 1 or 2, characterized in that: the citrus fruits are citrus, tangerine, orange, pomelo, lemon, high orange or miscellaneous citrus fruit. 4, a kind of extracting process of citrus peel essential oil is characterized in that comprising the following steps successively: 1), select the fresh pericarp of citrus fruit, the white cortex of described pericarp inner layer is less than or equal to 0.5mm; 2) Squeeze the above-mentioned pericarp, and spray high-pressure water while squeezing; a mixture composed of oil-water mixture and fruit particles can be obtained; 3) Using a centrifuge to separate the above mixture, remove the fruit particles, and obtain the oil-water mixture; the separation factor is 560-580; 4), the above-mentioned oil-water mixture is separated using a special orange oil separator, and water is removed to obtain oil; the separation factor is 9000-11000; 5), above-mentioned oil is carried out dewaxing step. 5. The extraction process of citrus peel essential oil according to claim 4, characterized in that: said step 2) uses a three-roll sugarcane press for pressing. 6. The extraction process of citrus peel essential oil according to claim 4 or 5, characterized in that: the citrus fruits are citrus, tangerine, orange, pomelo, lemon, high orange or miscellaneous citrus fruit.