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Microwave-assisted subcritical essential oil extracting method

A microwave-assisted, subcritical technology, applied in the directions of essential oils/spices, fat generation, etc., to avoid the problem of harmful solvent residues, ensure quality and yield, separation and purification degree and high product yield.

Inactive Publication Date: 2016-04-13
JIANGSU NAIQUE BIOLOGICAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are no reports on the application of microwave-assisted subcritical extraction-molecular distillation combined technology in the preparation of plant essential oils at home and abroad

Method used

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  • Microwave-assisted subcritical essential oil extracting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Microwave-assisted subcritical extraction of tea tree essential oil specifically comprises the following steps:

[0036] 1) Take 300kg of leaves of Melaleuca alternifolia, freeze at -20°C for 10 hours, and then pulverize and pass through a 10-mesh sieve;

[0037] 2) putting the pulverized product of step 1) into an extraction tank, and evenly passing the R134a in the solvent storage tank through the extraction tank containing the pulverized plant tissue;

[0038] 3) Start the built-in microwave generator in the extraction tank, and control the solvent R134a flow rate to 0.8m 3 / h, the microwave frequency is 2000MHz, the power is 800w, the extraction temperature is 10°C, and the extraction pressure is 4.0Mpa;

[0039] 4) Put the R134a subcritical fluid dissolved with plant essential oils from the extraction tank into the evaporation tank, after 6 hours of repeated cycle extraction, stop the solvent circulation, and recover the extraction solvent R134a in the ...

Embodiment 2

[0041] Embodiment 2 Microwave-assisted subcritical extraction of lavender essential oil specifically comprises the following steps:

[0042] 1) Take 400kg of lavender flowers, freeze them at -20°C for 10 hours, and crush them through a 20-mesh sieve;

[0043] 2) putting the pulverized product of step 1) into an extraction tank, and evenly passing the R134a in the solvent storage tank through the extraction tank containing the pulverized plant tissue;

[0044] 3) Start the built-in microwave generator in the extraction tank, and control the flow rate of solvent R134a to 1.0m 3 / h, the microwave frequency is 2000MHz, the power is 1000w, the extraction temperature is 10°C, and the extraction pressure is 4.0MPa;

[0045] 4) Put the R134a subcritical fluid dissolved with plant essential oil from the extraction tank into the evaporation tank, after 8 hours of repeated cycle extraction, stop the solvent circulation, and recover the extraction solvent R134a in the evaporation tank at...

Embodiment 3

[0047] Embodiment 3 Microwave-assisted subcritical extraction of rose essential oil specifically comprises the following steps:

[0048] 1) Take 200kg of fresh roses, freeze them at -20°C for 8 hours, and crush them through a 10-mesh sieve;

[0049] 2) putting the pulverized product of step 1) into an extraction tank, and evenly passing the R134a in the solvent storage tank through the extraction tank containing the pulverized plant tissue;

[0050] 3) Start the built-in microwave generator in the extraction tank, and control the flow rate of solvent R134a to 0.6m 3 / h, the microwave frequency is 1600MHz, the power is 800w, the extraction temperature is 10°C, and the extraction pressure is 6.0MPa;

[0051] 4) Put the R134a subcritical fluid dissolved with plant essential oil from the extraction tank into the evaporation tank, after 5 hours of repeated cycle extraction, stop the solvent circulation, and recover the extraction solvent R134a in the evaporation tank at normal tem...

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Abstract

The invention discloses a microwave-assisted subcritical essential oil extracting method. The microwave-assisted subcritical essential oil extracting method includes the steps that fresh plant tissues are frozen and then are smashed; 1,1,1,2-tetrafluoroethane is used as an extraction solvent and is led into the smashed plant tissues to perform microwave extraction; during microwave extraction, the extraction temperature is controlled to be 8-12 DEG C, the extraction pressure is controlled to be 0.8-6 Mpa, the microwave frequency is controlled to be 300-2400 MHZ, and the power is controlled to be 200-1200w; after a liquid phase in the system is separated out and microwave extraction is completed, the 1,1,1,2-tetrafluoroethane is recovered from the liquid phase, and the rest of the liquid phase is an essential oil stock solution; the essential oil stock solution is subjected to molecular distillation to obtain essential oil. By the adoption of the microwave-assisted subcritical essential oil extracting method, the essential oil free of any residual solvent can be obtained at lower temperature, the effective ingredients of the essential oil are not destroyed, and the natural quality of the essential oil can be kept to the most degree.

Description

technical field [0001] The invention relates to essential oil extraction, in particular to a microwave-assisted subcritical extraction method for essential oil. Background technique [0002] Plant essential oil is a volatile aromatic substance extracted from the flowers, leaves, stems, roots or fruits of plants, also known as volatile oil, essential oil or aromatic oil. The aroma of plant essential oils can relieve stress and cheer up the mood. Different types of plant essential oils also have different effects. With drug treatment, they are very helpful for many diseases and can make the disease recover faster. Essential oils can purify the air, disinfect, sterilize, etc. in daily life, so they are widely used in industries such as pharmaceuticals, food, tobacco, and cosmetics. [0003] The extraction methods of essential oils are mainly concentrated in supercritical extraction and steam distillation extraction. Among them, steam distillation has the disadvantages of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B9/02
CPCC11B9/025C11B9/027
Inventor 魏元刚钟慧朱海亮易铭杨永安
Owner JIANGSU NAIQUE BIOLOGICAL ENG
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