Preparation method and device using microwave and gravity to extract natural plant essential oil and hydrolat

Abstract

The invention discloses a preparation method and device using microwave and gravity to extract natural plant essential oil and hydrolat. The method includes the steps of firstly, placing to-be-extracted fresh natural plant raw materials into a microwave reactor, and placing into a microwave generator; secondly, controlling microwave power to be 150-800W to perform extraction for 10-20 minutes; thirdly, allowing the natural plant essential oil and hydrolat to flow into an essential oil collecting device under the effect of gravity; fourthly, separating the essential oil and hydrolat through a piston valve after the extraction. The device comprises the microwave generator, the microwave reactor fixed in the microwave generator, a condenser pipe connected with the microwave reactor through a connecting pipe, the essential oil collecting device mounted at the bottom of the condenser pipe, and hydrolat receiving bottles placed on the lateral sides and below the essential oil collecting device. The raw materials are placed in the microwave reactor. The preparation method and device using the microwave and gravity to extract the natural plant essential oil and hydrolat is efficient and clean, and the obtained essential oil and hydrolat is good in quality.

Description

technical field [0001] The invention relates to a preparation method and device for microwave gravity extraction of natural plant essential oil and pure dew, belonging to the technical field of natural product chemical extraction. Background technique [0002] The traditional extraction process of natural plant essential oils and pure dew is based on the principle of azeotropy, using water vapor and its diffusion method. The traditional method not only consumes a lot of solvents, but also consumes a lot of energy during the long-term high-temperature extraction process, which increases the extraction cost. At the same time, there is also the risk of loss or degradation of some natural active products, which will affect the physicochemical properties and biological activities of the final product. [0003] Application number CN104017099A discloses a method for microwave extraction and separation of pea polysaccharides: firstly, the crushed peas are subjected to microwave-assi...

AI Technical Summary

Problems solved by technology

[0002] The traditional extraction process of natural plant essential oils and pure dew is based on the principle of azeotropy, using water vapor and its diffusion method. The traditional method not only consumes a lot of solvents, but also consumes a lot of energy during the long-term high-temperature extraction process, which increases the extraction cost. At the same time, there is also the risk of loss or degradation of some natural active products, which will affect the physicochemical properties and biological activities of the final product

[0003] Application number CN104017099A discloses a method for microwave extraction and separation of pea polysaccharides: firstly, the crushed peas are subjected to microwave-assisted extraction with 20wt% ethanol solution, the ratio of solid to liquid is controlled to be 1:5~1:10, and the microwave power is 200W. The extraction time was 3 hours and a total of 3 extractions; the application number CN102028734A used microwave extraction method to extract flavonoids from fenugreek, roasted and crushed fenugreek seeds, added ethanol solution with 10 times the mass of raw materials, and microwaved 50~95W / g Intermittent irradiation under conditions; application number CN103450322A extracts ursolic acid in gardenia with microwave assistance: use gardenia residue as raw material, use a certain concentration of ethanol solution as extraction solvent, and extract under 150~200W microwave conditions 5~10min; in the above patents, the types of solvents are limited, the amount of solvent added is relatively large, and the excess solvent needs to be separated out in subsequent operations, which cannot fundamentally solve the cumbersome preparation steps of the traditional process. The situation of the microwave extraction device used is not mentioned in the patent, although the patents with the authorization numbers CN1142003C and CN203123616U disclose the design of the microwave extraction device respectively, but these two microwave extraction devices have complicated devices and cannot directly collect the extracts. disadvantages; Chinese patent CN104711121A reports the use of ultrasonic-assisted solvent-free microwave extraction of wild chrysanthemum essential oil, but the materials described in the patent are processed by drying and ultrasonic waves, and microwave extraction is carried out after spraying distilled water, resulting in complicated pre-treatment processes for raw materials

[0004] Existing natural plant essential oils and hydrosols are mostly extracted using the traditional method of heating from outside to inside and steam distillation. This method uses a lot of solvents, takes a long time to heat, has low heat transfer efficiency, consumes a lot of energy, and also has natural activity. The risk of component loss and degradation, which will inevitably affect the economics and environmental protection of the process, as well as the yield and quality of the final extract

Images