Microwave-assisted subcritical essential oil extracting method

[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 ...

[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...

[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...