Extraction method for shaddock peel essential oil

Abstract

The invention discloses an extraction method for shaddock peel essential oil. The method comprises the following steps of: firstly selecting fresh shaddocks, peeling off outer shaddock peel oil gland layers and discarding flesh; soaking the shaddock peel oil gland layers in 0.8-1.0 percent NaCl aqueous solution for 2-3 hours, wherein the mass-volume ratio of shaddock peel to the NaCl aqueous solution is 1:4-5; squeezing the soaked shaddock peel by using a spiral squeezer to obtain oil-water mixed liquor containing some pigments, phlegm and shaddock peel residue; standing under reduced pressure and layering, discarding a water layer and the shaddock peel residue to obtain mixed liquor containing some pigments, phlegm and a small amount of water; and distilling the mixed liquor under reduced pressure, cooling distillate to obtain oil-water mixed liquor, naturally layering the oil-water mixed liquor and discarding the water layer to obtain the shaddock peel essential oil. The extraction method has the advantages of good quality of obtained essential oil, low cost, simple process, high operability, high production efficiency and good economic benefit.

Description

technical field [0001] The invention relates to a method for extracting pomelo peel essential oil, in particular to a large-scale extraction method for pomelo peel essential oil. Background technique [0002] Pomelo peel accounts for 30% to 40% of the whole grapefruit. At present, pomelo peel is generally treated as garbage, which not only causes a great waste of resources, but also pollutes the environment. Therefore, the comprehensive utilization of this resource has good social and economic benefits. Pomelo peel essential oil is one of the most important natural raw materials in the fragrance industry. It is widely used in food and daily chemical industries. Moreover, pomelo peel essential oil has a unique aroma, but so far it cannot be chemically synthesized, nor can it be replaced by other citrus. At present, the extraction of pomelo peel essential oil often adopts pressing method, steam distillation method and supercritical carbon dioxide extraction method. There are ...

AI Technical Summary

Problems solved by technology

Supercritical carbon dioxide extraction has a large one-time investment and high cost, which is not conducive to industrial production, and the obtained essential oil contains many impurities, and some pigments, flavonoids and other substances will also be extracted, which needs to be further separated by molecular distillation, resin separation and other methods , the purification process is complicated

[0003] Chinese invention patent 200510049888.9 discloses a process for extracting citrus peel essential oil by using a sugarcane press and then using a centrifuge to separate oil from water. This method is mainly used in laboratory-type small-scale production. there are certain limitations

Moreover, the oil after high-speed centrifugation will still contain some impurities such as pigments and mucus, and the separation is more cumbersome.

[0004] Chinese invention patent application 201010108789.4 uses a screw press to directly squeeze citrus peels, then refrigerates at 5-7°C for 7-9 days, and finally distills under reduced pressure to obtain essential oils. This method takes a long time to refrigerate for 7-9 days and is not It is conducive to industrial production, and the essential oil content of pomelo peel is not as high as that of citrus, but the pectin layer is much thicker than that of citrus. If you directly squeeze the pomelo peel, the oil bubbles cannot be fully crushed. The adsorption effect cannot make the essential oil components fully flow out, and the yield is low