Rose essential oil contains a large amount of citronellol, geraniol, nerol and other compounds.
It has long been one of the popular floral essential oils in the international food industry market, mainly used in beverages, candy, ice cream, seasonings , In health food.
It can be used to produce high-quality perfumes and high-quality cosmetics in the chemical industry. The market is expensive and the demand is huge; however, the existing technology has a low extraction efficiency of rose essential oil, complex processes, and polluted the environment. There is an urgent need to develop a new rose The extraction process of flower essential oil transforms roses into a new value-added development direction.
Supercritical CO2 extraction of rose essential oil
The rose is a plant belonging to the genus Rosa in the family Rosaceae. It is an upright deciduous shrub. The flowers have a sweet fragrance.
Extracting rose essential oil from roses is one of the oldest essential oils. Roses have the functions of regulating qi, activating blood circulation, beautifying and nourishing, converging, etc., and treat irregular menstruation, traumatic injuries, liver gas and stomach pain embolism.
The combination of supercritical extraction and molecular distillation not only has a low operating temperature and a short heating time, it can avoid the oxidation and rancidity of grease caused by high temperature, and the separation degree and product yield are high.
Molecular distillation can also reduce rose oil The acid value does not need to be centrifuged, which reduces costs.
Remove impurities from fresh roses, put them in vacuum freeze-drying equipment for 20-30 hours, then take them out, put them in crushing equipment, crush and sieve, to prepare 50-60 mesh rose crushed material, and set aside;
Set the pressure in the extractor to 20Mpa and the temperature to 40°C. The mixed fluid of the extracted CO2 and rose essential oil is input into the separator for decompression separation. The pressure in the separator is 6Mpa and the temperature is 37°C.
After the CO2 is liquefied by the liquefier, it is directly returned to the storage tank at 26°C for the next round of extraction and separation cycle. Each round of extraction and separation time is 1.5 hours. After separation, the primary rose oil is prepared and reserved;
Primary rose flower oil is added to the molecular distiller, the vacuum degree in the molecular distiller is set to 1.0-2.0Pa, the temperature is 60-80°C, and the rotating brush speed in the molecular distiller is 120r/min until The primary rose oil is completely collected by the heavy-phase collection tank and the light-phase collection tank, and the rose-phase crude oil is collected in the heavy phase collection tank and is used;
Add rose oil to the molecular distiller again, reset the vacuum degree in the molecular distiller to 1.0-2.0Pa, the temperature to 60-80°C, and the rotating brush speed in the molecular distiller to 120r/min Until rose oil is completely collected by heavy phase collection tank and light phase collection tank, and rose oil is collected in heavy phase collection tank.
Extraction pressure: 20 MPa
Extraction temperature: 40°C
Extraction time: 90 min
Separation kettle Ⅰ pressure: 6 MPa
Separation kettle Ⅰ temperature: 37°C